3.1 DNA Slides

Multiple Choice

Which of the following best describes the role of DNA in living organisms?

• It stores genetic information that determines traits

• It provides energy for cellular activities

• It helps organisms move

• It protects cells from viruses

Multiple Choice

Why do humans share a significant percentage of their DNA with organisms like bananas?

• Because all living organisms have DNA and the sequence of DNA determines traits.

• Because bananas and humans are closely related species.

• Because humans eat bananas, so their DNA mixes.

• Because DNA is only found in plants and humans.

Open Ended

What is the biomolecule that builds up our DNA, and what is the monomer for that biomolecule?

Multiple Choice

Who was responsible for creating Photo 51, which revealed the double helix structure of DNA?

• Rosalind Franklin

• James Watson

• Francis Crick

• Gregor Mendel

Multiple Select

Which of the following are parts of a nucleotide? (select 3)

• Sugar

• Phosphate

• Nitrogen Base

• Amino Acid

Multiple Choice

What two components make up the backbone of a DNA strand?

• Phosphate groups and deoxyribose sugars

• Nitrogenous bases and hydrogen bonds

• Adenine and thymine

• Guanine and cytosine

Fill in the Blanks

The bond that holds nitrogenous bases together in the DNA double helix is called a

bond.

Multiple Select

Which of the following statements about nitrogenous bases in DNA are correct? (select 3)

• They make up the inside of the double helix

• They are held together by hydrogen bonds

• There are four types: adenine, thymine, guanine, cytosine

• They form the backbone of DNA

Open Ended

What are 2 things that are bonded to guanine?

Multiple Choice

Which enzyme is responsible for unwinding the DNA during replication?

• Helicase

• Polymerase

• Ligase

• Primase

Reorder

Put the steps of DNA Replication in the right order: (left to right)

• Helicase unwinds DNA

• Helicase separates the strands

• Polymerase adds nucleotides

• 2 identical DNA strands are made

1

2

3

4

• 1
• 2
• 3
• 4

Multiple Choice

In the semi-conservative model of DNA replication, what does each new DNA molecule consist of?

• One old strand and one new strand

• Two old strands

• Two new strands

• One strand of RNA and one strand of DNA

Fill in the Blanks

What part of the DNA strand contains our inherited traits?

Multiple Choice

What are the base-pairing rules for DNA, and how do they help ensure accurate genetic information transfer?

• A pairs with T, C pairs with G

• A pairs with C, T pairs with G

• A pairs with G, C pairs with T

• A pairs with A, T pairs with T

Multiple Select

According to Chargaff's Rule, which of the following statements are correct? (select 2)

• The percentage of A equals the percentage of T

• The percentage of C equals the percentage of G

• The percentage of A equals the percentage of G

• The percentage of T equals the percentage of C

Multiple Choice

If a DNA sample contains 20% cytosine, what percentage of adenine would you expect to find?

• 60%

• 30%

• 70%

• 50%

Open Ended

How do the 3 parts of the nucleotide help build the DNA double helix?