Benjamin, Luna, and Grace are on a genetics adventure! They discover that mutations can happen during the cell cycle before both mitosis and meiosis. Which of the following statements about mutations is true?

A mutation in the DNA of the parent's gamete can cause the offspring's somatic (body) cells to produce a protein that does not function.

Mutations in the DNA of the parent's somatic (body) cells never affect the individual in which they happen.

Mutations in the DNA of the parent's somatic (body) cells can cause the offspring to produce a protein that does not function.

A mutation in the DNA of the parent's gamete affects the somatic (body) cells of the parent that produced the gamete.

Olivia and Daniel are on a genetics adventure! While exploring a mysterious plant, they discover that a segment of its DNA has undergone a mutation: The original DNA sequence was ACG, but now it’s ACA. Using the codon chart, can you help them figure out if this mutation will cause a change in the plant’s phenotype?

No because even though the DNA sequence changed, the mRNA sequence still codes for the same amino acid, so no change in protein will occur.

No because even though the DNA sequence changed, the mRNA sequence still codes for the same amino acid, so the protein will not function properly.

Yes because the protein of the organism would change because it codes for a different amino acid.

Yes because the protein of the organism would change because any change in the DNA sequence will cause a change in the resulting protein.

Lily, Kai, and Ethan are working together in a genetics lab when they spot a mysterious change in a DNA sequence! Check out the diagram above—can you help them figure out which type of mutation they’re seeing and what effect it will have on the protein?

A frameshift mutation that would change many amino acids in the protein after the change

A completion mutation that would change only one amino acid

A substitution mutation that will prevent translation from occurring

A translocation mutation that will have no effect on protein function

Scarlett, James, and Isla are working together in their genetics lab, trying to solve a mystery about mutations! They want to discover which type of mutation would MOST LIKELY cause a dramatic change in an organism's phenotype. Which mutation should they be most worried about?

A single-base insertion at the beginning of the gene sequence

A single-base insertion at the end of the gene sequence

A single-base substitution at the end of the gene sequence

A single-base substitution at the beginning of the gene sequence

Ethan, Evelyn, and Rohan are exploring the mysteries of genetics in their science class. They discover that sometimes, changes can sneak into a DNA sequence. Which statement best describes these sneaky mutations?

Errors during DNA replication that increase genetic variation.

Errors during protein synthesis that decrease genetic variation.

Errors during protein synthesis that increase genetic variation.

Errors during DNA replication that decrease genetic variation.

Scarlett, Noah, and Maya are curious about how a tiny change in DNA can end up changing things like eye color or hair texture! They team up to create a flow chart that shows this cool journey: Change in DNA → Change in RNA → Change in protein → Change in phenotype. What would be the best title for their awesome flow chart?

How Mutations Affect Physical Characteristics

The Effects of Osmosis on Phenotype

The Relationship between tRNA and rRNA in Cell Processes

Emma, Benjamin, and Zoe are on a science adventure, exploring how different species manage to survive when their environment suddenly changes—like during a drought or a chilly snap! Which statement correctly explains how mutations can help a species increase its chances of survival in a changing environment?

Mutations are a source of genetic variation in the species.

Mutations are the cause of disease in the species.

Mutations are always passed on to subsequent generations of the species.

Mutations are not harmful when they occur in somatic (body) cells of the species.

James, Priya, and Abigail are teaming up for a science experiment to explore how temperature affects DNA mutations in the lab. What is a research question they could ask for their investigation?

Do DNA replication enzymes make more errors at high temperatures?

What is the optimum pH for DNA replication enzymes?

Does DNA permanently dissolve at very high temperatures?

Do high temperatures increase the amount of DNA nucleotides in a cell?

Abigail, Michael, and Evelyn are working together in their biology class. They discover that scientists can transfer genes from one organism to another, like from bacteria to plants, and the new organism can still read the genetic instructions correctly. Which statement BEST explains why this amazing genetic trick works?

All organisms match the same codon to the same amino acid.

All organisms pass genes to offspring through RNA.

All organisms can grow, respond to stimuli, and reproduce.

All organisms contain the same cell organelles as other organisms.

Chloe, Noah, and Benjamin are studying genetics together. They discover that the mRNA codon UCG codes for the amino acid serine in frogs, humans, and horses. What cool fact does this reveal to them?

The genetic code is the same for nearly all organisms.

A mutation in one base will always have a physical effect on the resulting protein.

The genetic code does not dictate the amino acid sequence of proteins.

A mutation in one base could have absolutely no physical effect on the resulting protein.

Michael, Abigail, and Grace are exploring genetics in their science club. They discover that a pig contains the mRNA sequence: UCC AGG UUA, which translates to the amino acid sequence: serine-arginine-leucine. The trio starts wondering: if the same mRNA (UCC AGG UUA) was placed in a bacteria cell, what would happen? Which of the following statements BEST describes the outcome?

It would still code for the same amino acids because the genetic code is universal.

It would not be translated at all because it is a different species.

It would code for different amino acids because bacterial DNA is not housed in a nucleus.

It would only code for two of the three amino acids because bacteria cells are much smaller.

Benjamin, Grace, and Aiden are on a mission in their biology lab to crack the code of life! They’re examining a cool diagram of the DNA double helix, trying to figure out what makes up each DNA nucleotide. Can you help them discover which molecules join together to build a single DNA nucleotide?

deoxyribose, a phosphate group, and one nitrogenous base

ribose, a phosphate group, and two nitrogenous bases

ribose, two phosphate groups, and one nitrogenous base

deoxyribose, two phosphate groups, and one nitrogenous base

Avery, Mason, and Anika are preparing for their biology exam and have decided to quiz each other on proteins. They come across the following statements in their notes. Can you help them figure out which statement about proteins is NOT true?

Proteins are replicated in order to store and transmit genetic information across generations.

Proteins have many functions in a cell, including to regulate the rate of biochemical reactions.

Proteins contain nitrogen as well as carbon, hydrogen, and oxygen atoms.

Amino acids are the building blocks of proteins within living organisms.

James and Luna are helping Abby in a laboratory, where they're studying some super-tough bacteria that thrive in hot springs at sizzling temperatures of 70 °C or higher! They extract special enzymes from these bacteria, like helicase and DNA polymerase, and decide to see what happens if they try to use them for DNA replication at a much cooler temperature. What do you think will happen to these enzymes when they work at the lower temperature?

The enzymes will copy DNA more slowly than they would at 70 °C.

The enzymes will be destroyed by lysosomes and will not copy DNA.

The enzymes will require less energy to copy DNA than they would at 70 °C.

The enzymes will lose their bond structure and fall apart, so no DNA will be copied.

Evelyn, Abigail, and Ethan are on a mission in Biology class to discover the best way to extract DNA from a mysterious plant! Evelyn thinks adding soap will help them get more DNA because it can break up the lipids in the cell membrane and let the DNA escape. To test this, the trio crushes the plant's cells in saltwater and splits the mixture between two containers. They add soap to one container, then mix both up like mad scientists. After straining each mixture with a filter, they pour cold alcohol on top to attract the DNA. Sure enough, the soapy container produces more DNA! But here's the twist: why did they bother with the container that had no soap, even though soap worked better?

The container without soap was the control group. It showed that the increase in DNA extraction was caused by the presence or absence of soap (not some other unknown factor).

The container without soap was the dependent variable. The results of the experiment depended on the presence or absence of soap in the mixture.

The container without soap was a replicate. Replication in experiments increases the validity of the results, so two containers were used instead of just one.

The container without soap was a back-up in case the DNA extraction did not work in the container with soap. Jonathan would be able to add other chemicals to this container to test (like an acid or pH buffer) if soap was ineffective.

Lucas, Ava, and Henry are investigating how changes in DNA can impact an organism. They find a gene where a single base is deleted near the start of the sequence. What is the MOST LIKELY effect of this mutation?

It will cause a frameshift, changing many amino acids in the protein.

It will stop the gene from being transcribed into mRNA.

It will have no effect on the protein produced.

It will only change the last amino acid in the protein.

Ella, Jack, and Grace are studying how mutations can be inherited. If a mutation occurs in the DNA of a parent's gamete, what is the possible outcome for the offspring?

The offspring may inherit the mutation and it could affect their traits.

The mutation will only affect the parent and not the offspring.

The mutation will be corrected before fertilization occurs.

The offspring will always develop a genetic disorder.

Sophia, Ethan, and Mia are learning about how genetic information is passed from parents to offspring. They wonder what would happen if a mutation occurs in a parent's somatic (body) cell. Which statement best describes the outcome?

The mutation will only affect the parent and not be passed to the offspring.

The mutation will be inherited by the offspring and affect their traits.

The mutation will be corrected during cell division.

The mutation will always cause a genetic disorder in the parent.

Lucas, Ava, and Henry are studying the effects of different types of mutations. They find a gene where a single base is substituted in the middle of the sequence. What is the MOST LIKELY effect of this mutation?

It may change one amino acid in the protein, possibly affecting its function.

It will cause a frameshift, changing all amino acids after the mutation.

It will prevent the gene from being transcribed into mRNA.

It will have no effect on the protein produced.

Ella, Jack, and Grace are exploring why the genetic code is considered universal. They wonder what would happen if a gene from a jellyfish is inserted into a plant cell. Which statement BEST explains the result?

The plant cell will use the same genetic code to produce the protein encoded by the jellyfish gene.

The plant cell will not be able to read the jellyfish gene because it is from a different species.

The jellyfish gene will be destroyed by the plant cell's enzymes.

The plant cell will only partially express the jellyfish gene.

Olivia, Liam, and Harper are investigating how a substitution mutation in a DNA sequence might affect the resulting protein. If a single base is replaced in the middle of a gene, what is the MOST LIKELY outcome?

It may change one amino acid in the protein, possibly altering its function.

It will cause a frameshift, changing all amino acids after the mutation.

It will have no effect on the protein produced.

It will prevent the gene from being transcribed into mRNA.

Jackson, Ava, and Sophia are studying DNA replication in their biology class. They learn that DNA replication is described as 'semiconservative.' What does this mean for the new DNA molecules formed?

Each new DNA molecule contains one original strand and one new strand.

Each new DNA molecule is made up of two original strands.

Both strands in the new DNA molecule are newly synthesized.

DNA replication only occurs in half of the cell's chromosomes.

Ella, Mason, and Zoe are exploring how mutations can be inherited. If a mutation occurs in the DNA of a parent's gamete, what is the possible effect on the offspring?

The offspring may inherit the mutation and it could affect their traits.

The offspring will always develop a genetic disorder.

The mutation will only affect the parent and not the offspring.

The mutation will be corrected before fertilization occurs.

Lucas, Mia, and Ethan are investigating how a change in DNA can affect an organism. If a single base is substituted in the middle of a gene, which of the following is the MOST LIKELY result?

It may change one amino acid in the protein, possibly altering its function.

It will always result in a nonfunctional protein.

It will prevent the gene from being transcribed into mRNA.

It will cause a frameshift, changing all amino acids after the mutation.

Olivia, Jack, and Grace are studying how genetic information is passed on. If a mutation occurs in the DNA of a parent's gamete, what could happen to the offspring?

The offspring may inherit the mutation and it could affect their traits.

The offspring will always develop a genetic disorder.

The mutation will be corrected before fertilization occurs.

The mutation will only affect the parent and not the offspring.

Emma, Benjamin, and Zoe are exploring how mutations can help a species survive environmental changes. Which statement best explains the role of mutations in evolution?

Mutations are a source of genetic variation in the species.

Mutations are the cause of disease in the species.

Mutations prevent adaptation to new environments.

Mutations are always harmful to the species.

Ella, Jack, and Grace are investigating how a change in a single base of DNA can affect the protein produced. If a substitution occurs at the beginning of a gene, what is the MOST LIKELY result?

It may change the first amino acid in the protein, possibly altering its function.

It will prevent the gene from being transcribed into mRNA.

It will cause a frameshift, changing all amino acids after the mutation.

It will have no effect on the protein produced.

Lucas, Ava, and Henry are studying mutations in their biology class. They find a gene where a single base is inserted near the start of the sequence. What is the MOST LIKELY effect of this mutation?

It will cause a frameshift, changing many amino acids in the protein.

It will stop the gene from being transcribed into mRNA.

It will only change the last amino acid in the protein.

It will have no effect on the protein produced.

Scarlett, James, and Isla are exploring how mutations can impact an organism's traits. Which type of mutation is MOST LIKELY to cause a significant change in phenotype?

A single-base deletion at the beginning of the gene sequence

A single-base insertion at the beginning of the gene sequence

A single-base substitution at the beginning of the gene sequence

A single-base substitution at the end of the gene sequence

DNA Replication and Basic Gene Expression

Authored by Josue Urbina

Science

9th Grade

DNA Replication and Basic Gene Expression

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42 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Hannah, Maya, and Arjun are working together in a genetics lab, and they're on a mission to crack the DNA code! They discover an original DNA strand with the sequence CCT-GCA-TAC. If the team wants to figure out the sequence on the new, complementary strand, what will it be?

CCT-GCA-TAC

GGA-CGT-ATG

GGA-CGU-AUG

CCU-CGT-UAC

Answer explanation

During DNA replication, adenine pairs with thymine (A-T) and cytosine pairs with guanine (C-G). The original strand CCT-GCA-TAC pairs to form GGA-CGT-ATG, making GGA-CGT-ATG the correct complementary sequence.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Aria, Daniel, and Liam are on a science adventure in biology class! Their teacher just revealed that DNA replication is "semiconservative." Can you help them figure out what this means?

Each new DNA molecule is made up of one original (parent) strand and one newly synthesized strand.

The new DNA molecule is made up of two completely new strands.

The process requires very little energy, making it "conservative."

The cell only copies half of its DNA during replication to save resources.

Answer explanation

The term "semiconservative" means that each new DNA molecule consists of one original (parent) strand and one newly synthesized strand, ensuring genetic continuity and accuracy during replication.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Evelyn, Ava, and Mason are working together in a genetics lab when they discover a mysterious DNA sample that contains 18% cytosine. After the DNA is replicated and split into two daughter cells during cell division, what will each cell's percentage of guanine be?

18%

32%

82%

Answer explanation

In DNA, cytosine (C) pairs with guanine (G). If the sample has 18% cytosine, it must also have 18% guanine. This ratio remains the same after replication, so each daughter cell will also have 18% guanine.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Charlotte, William, and Aria are in a genetics lab, and they're on a mission to help cells copy their DNA before they divide! Which of the following statements best describes what happens during DNA replication in their exciting experiment?

Part of a DNA sequence is read by RNA polymerase, which produces a complementary strand of RNA.

Messenger RNA is decoded by a ribosome to produce an amino acid chain. In the cell's cytoplasm, transfer RNA joins the messenger RNA, forming a polypeptide.

Two free-floating single strands of DNA are joined by DNA polymerase. The polymerase finds the point at which the two strands will match up into a double strand.

A double-stranded DNA molecule is unwound into two single strands. DNA polymerase matches the correct nucleotides to the single strands of DNA, which forms two new complementary strands of DNA.

Answer explanation

The correct choice describes DNA replication accurately: the double-stranded DNA unwinds, and DNA polymerase matches nucleotides to form two new complementary strands, which is essential for DNA replication.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Noah, Evelyn, and Elijah are working together in their biology class, diving into the mysteries of genetics! They discover a DNA sequence in a gene that reads G G A T G C C A T. When this gene is expressed during transcription, which of the following molecules could be produced?

DNA with the sequence G G A U G C C A U

mRNA with the sequence C C U A C G G U A

rRNA with the sequence G G A T G C C A T

tRNA with the sequence C C T A C G G T A

Answer explanation

During transcription, DNA is converted to mRNA. The original DNA sequence G G A T G C C A T is transcribed to mRNA as C C U A C G G U A, replacing thymine (T) with uracil (U). Thus, the correct answer is mRNA with the sequence C C U A C G G U A.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Arjun and Priya are teaming up in a genetics lab, exploring the mysteries of gene expression in human cells. As they examine the diagram, they spot something interesting happening at label A. Which of the following statements best describes and explains the process taking place at label A?

The process is transcription because double-stranded DNA is used to make a complementary single strand in the nucleus.

The process is replication because DNA is being used as a template to make a complementary single strand of RNA.

The process is translation because double-stranded DNA is used to make a complementary single strand in the cytoplasm.

The process is mutation because the bases on the new strand are not identical to the original strand.

Answer explanation

The correct choice is that the process is transcription, as it involves using double-stranded DNA to synthesize a complementary single strand of RNA in the nucleus.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Aiden, Mia, and Harper are on a biology adventure, trying to uncover how cells create RNA from DNA! Which of the following statements about transcription is correct?

In eukaryotes, transcription takes place in the cytoplasm with the help of ribosomes.

Helicase and DNA Polymerase break each DNA molecule into many pieces, copy the pieces, and link them back together.

An enzyme uses a DNA sequence as the template for building a molecule of RNA.

In prokaryotes, transcription takes place in the nucleus to create new DNA molecules.

Answer explanation

The correct statement is that an enzyme uses a DNA sequence as the template for building a molecule of RNA. This accurately describes the process of transcription, where RNA is synthesized from a DNA template.

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DNA Replication and Basic Gene Expression

Hannah, Maya, and Arjun are working together in a genetics lab, and they're on a mission to crack the DNA code! They discover an original DNA strand with the sequence CCT-GCA-TAC. If the team wants to figure out the sequence on the new, complementary strand, what will it be?

During DNA replication, adenine pairs with thymine (A-T) and cytosine pairs with guanine (C-G). The original strand CCT-GCA-TAC pairs to form GGA-CGT-ATG, making GGA-CGT-ATG the correct complementary sequence.

Aria, Daniel, and Liam are on a science adventure in biology class! Their teacher just revealed that DNA replication is "semiconservative." Can you help them figure out what this means?

The term "semiconservative" means that each new DNA molecule consists of one original (parent) strand and one newly synthesized strand, ensuring genetic continuity and accuracy during replication.

Evelyn, Ava, and Mason are working together in a genetics lab when they discover a mysterious DNA sample that contains 18% cytosine. After the DNA is replicated and split into two daughter cells during cell division, what will each cell's percentage of guanine be?

In DNA, cytosine (C) pairs with guanine (G). If the sample has 18% cytosine, it must also have 18% guanine. This ratio remains the same after replication, so each daughter cell will also have 18% guanine.

Charlotte, William, and Aria are in a genetics lab, and they're on a mission to help cells copy their DNA before they divide! Which of the following statements best describes what happens during DNA replication in their exciting experiment?

The correct choice describes DNA replication accurately: the double-stranded DNA unwinds, and DNA polymerase matches nucleotides to form two new complementary strands, which is essential for DNA replication.

Noah, Evelyn, and Elijah are working together in their biology class, diving into the mysteries of genetics! They discover a DNA sequence in a gene that reads G G A T G C C A T. When this gene is expressed during transcription, which of the following molecules could be produced?

During transcription, DNA is converted to mRNA. The original DNA sequence G G A T G C C A T is transcribed to mRNA as C C U A C G G U A, replacing thymine (T) with uracil (U). Thus, the correct answer is mRNA with the sequence C C U A C G G U A.

Arjun and Priya are teaming up in a genetics lab, exploring the mysteries of gene expression in human cells. As they examine the diagram, they spot something interesting happening at label A. Which of the following statements best describes and explains the process taking place at label A?

The correct choice is that the process is transcription, as it involves using double-stranded DNA to synthesize a complementary single strand of RNA in the nucleus.

Aiden, Mia, and Harper are on a biology adventure, trying to uncover how cells create RNA from DNA! Which of the following statements about transcription is correct?

The correct statement is that an enzyme uses a DNA sequence as the template for building a molecule of RNA. This accurately describes the process of transcription, where RNA is synthesized from a DNA template.

Arjun, Isla, and Emma are on a biology adventure! They discover a mysterious DNA segment: A T C A G G C G T G G C. Can you help them figure out how many amino acids are coded for by this segment?

The DNA segment codes for amino acids through codons, which are groups of three nucleotides. The given sequence has 12 nucleotides, forming 4 codons (A T C, A G G, C G T, G G C), thus coding for 4 amino acids.

Isla, Michael, and Daniel are working together in biology class to crack a genetic code! They discover a mysterious gene with the DNA sequence TAC-TCC-GTG-ATT. Using the codon table, can you help them figure out which protein is produced from this sequence?

The DNA sequence TAC-TCC-GTG-ATT translates to the mRNA sequence AUG-AGC-CAU-UAA. Using the codon table, this corresponds to Met - Arg - His - Stop, making it the correct answer.

Mia, Luna, and Zoe are on a genetics adventure in their biology class! They discover a mysterious DNA segment: TAC ACA CGG AGG GTA CGC TAT. Using the codon chart, can you help them crack the code and reveal what protein sequence this DNA segment creates?

The DNA sequence TAC ACA CGG AGG GTA CGC TAT translates to the mRNA sequence AUG UGU CCG UCC CAU GCG AUA. Using the codon chart, this corresponds to the protein sequence Met-Cys-Ala-Ser-His-Ala-Ile.

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