Which of the following statements correctly describes Chargaff’s contribution to the study of DNA?

Chargaff showed that adenine and thymine were found in equal percentages in DNA.

Chargaff hypothesized that DNA was a double helix.

Chargaff’s experiments conclusively proved that DNA was made of nucleotides.

Chargaff’s work proved that DNA could be made using radioactive nucleotides.

The macromolecules that make up nucleic acids contain which of the following elements?

Hydrogen, nitrogen, oxygen, and phosphorus

Hydrogen, nitrogen, and phosphorus

Which of the following best defines a gene?

A segment of DNA that codes for a particular protein

A diploid cell containing two sets of chromosomes

A unit made up of chromosomes that control for a specific trait

All the other answers are correct.

The duplication of DNA before cell division

The separation of two homologous chromosomes

The synthesis of all cell organelles during S phase

What is a nucleotide?

A monomer made of a 5-carbon sugar, a phosphate group, and a nitrogenous base

A monomer made of a adenosine triphosphate, a phosphate, and a sugar

Which of the following sets of terms lists the structures from smallest to largest?

Nucleotides, nucleic acids, genes, chromosomes

Genes, nucleotides, chromosomes, nucleic acids

Nucleic acids, nucleotides, chromosomes, genes

Chromosomes, genes, nucleic acids, nucleotides

Which statement best describes the role of DNA replication in the cell cycle of eukaryotes?

Replication is completed before the cell enters mitosis.

Replication divides the amount of DNA in half so the cell can divide.

Replication occurs just after the chromosomes condense during prophase.

Replication begins at a single starting point and proceeds in both directions.

The diagram shows a portion of a DNA molecule. Which statement best describes the role of DNA polymerase in the diagram?

It joins individual nucleotides to produce new strands of DNA.

It brings amino acids together to make proteins.

It breaks down and recycles worn-out nucleotides.

It enables DNA molecules to condense to form chromosomes.

The DNA that makes up genes is capable of all of the following except

transmitting genetic information.

Which statement best describes the functions of DNA?

DNA stores, copies, and transmits information.

DNA serves as a long-term source of energy.

DNA provides structural support inside the cell.

The diagram shows a portion of a DNA molecule. Which statement best describes the diagram?

Each DNA strand serves as a template for a new strand.

DNA replication moves in one direction.

Old DNA breaks down and is recycled after a cell divides.

After cell division, damaged sections of DNA are removed.

Which of the following statements about nucleic acids and nucleotides is true?

Nucleic acids are composed of subunits called nucleotides.

Nucleotides are chains of nucleic acids held together by bonds.

Nucleotides and nucleic acids are the same thing.

The nucleic acid DNA is composed of

sugar, phosphate, and nitrogenous bases.

sugar, protein, and nitrogenous bases.

protein, nitrogenous bases, and phosphate.

nitrogenous bases, phosphate, and RNA.

What is the first step in the process of DNA replication?

Condensing the DNA into chromosomes

TEKS 6A-DNA

Biology

9th - 12th Grade

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What property of DNA does bacterial transformation illustrate?

Bacterial DNA cannot move into other bacteria and function.

Bacterial DNA can move into another bacteria and function.

Bacterial DNA uses four nucleotides bases that work in pairs.

Bacterial DNA is found in a circular chromosome.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which part of the bacteriophage in the drawing contains genetic material?

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What happens when a piece of DNA is missing?

Genetic information is stored.

Genetic information is copied.

Genetic information is lost.

Genetic information is transmitted.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In which cells is the accurate transmission of information most important?

Nerve cells

Skin cells

Sex cells

Bone cells

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The drawing shows the structure of what molecule?

A DNA molecule

A lipid molecule

A carbohydrate molecule

A protein molecule

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The table shows the results of measuring the percentages of the four bases in the DNA of several different organisms. Some of the values are missing from the table. Based on Chargaff’s rule, the percentages of guanine bases in chicken DNA should be approximately what?

28.8%

19.9%

21.5%

13.4%

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Based on Chargaff’s rule, the percentage of cytosine in the DNA of the bacterium, S. lutea in the table, should be approximately what?

26.6%.

73.2%.

36.6%.

29.4%.

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TEKS 6A-DNA

What property of DNA does bacterial transformation illustrate?

Which part of the bacteriophage in the drawing contains genetic material?

What happens when a piece of DNA is missing?

In which cells is the accurate transmission of information most important?

The drawing shows the structure of what molecule?

The table shows the results of measuring the percentages of the four bases in the DNA of several different organisms. Some of the values are missing from the table. Based on Chargaff’s rule, the percentages of guanine bases in chicken DNA should be approximately what?

Based on Chargaff’s rule, the percentage of cytosine in the DNA of the bacterium, S. lutea in the table, should be approximately what?

Which of the following statements correctly describes Chargaff’s contribution to the study of DNA?

What enzyme works to add DNA to ends of chromosomes in rapidly dividing cells such as those found in an embryo, to prevent genes from being lost during replication?

In the drawing, what nucleotide is going to be added at point 1, opposite from thymine?

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