Question 1

Which of the following best describes the difference between DNA and RNA based on their sugar components?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 2

A scientist is analyzing a nucleotide and finds that it contains the base uracil. Which type of nucleic acid is this nucleotide most likely from?

Accepted Answer

RNA

Question 3

Which of the following correctly matches the number of hydrogen bonds with the DNA base pairs?

Accepted Answer

$$A$$ pairs with $$T$$ via 2 hydrogen bonds; $$G$$ pairs with $$C$$ via 3 hydrogen bonds.

Question 4

Which of the following is NOT a component of a nucleotide?

Accepted Answer

A fatty acid tail

Question 5

If a DNA strand has the sequence 5'-ATCGGTA-3', what is the complementary DNA strand?

Accepted Answer

3'-TAGCCAT-5'

Question 6

Which of the following best explains why changing the pH can denature a protein's secondary or tertiary structure?

Accepted Answer

pH changes disrupt hydrogen bonds and ionic interactions, altering the protein's folding.

Question 7

Which of the following is a purine base found in nucleic acids?

Accepted Answer

Adenine

Question 8

In the context of artificial selection in plants, which step is most critical to ensure that only desired traits are passed to the next generation?

Accepted Answer

Selecting and planting seeds from plants with the desired traits

Question 9

Which of the following best describes the antiparallel nature of DNA?

Accepted Answer

One strand runs 5' to 3', and the other runs 3' to 5'.

Question 10

Which of the following is NOT a function of nucleic acids?

Accepted Answer

Providing structural support to cell membranes

Question 11

Which of the following correctly lists the four groups attached to the central carbon of an amino acid?

Accepted Answer

Amino group, carboxyl group, hydrogen atom, R group

Question 12

A mutation causes a cytosine in DNA to be replaced with a thymine. Which type of base pairing will be affected?

Accepted Answer

Guanine-Cytosine pairing

Question 13

Which of the following best explains why proteins can be denatured by heat?

Accepted Answer

Heat disrupts hydrogen bonds and other interactions stabilizing secondary and tertiary structures.

Question 14

Which of the following statements about the genetic code is correct?

Accepted Answer

A codon is a sequence of three nucleotides that codes for an amino acid.

Question 15

Which of the following is a pyrimidine base found in both DNA and RNA?

Accepted Answer

Cytosine

Question 16

A student is asked to identify a molecule as DNA or RNA. The molecule is single-stranded and contains uracil. What is it?

Accepted Answer

RNA

Question 17

Which of the following best describes the role of nucleic acids in heredity?

Accepted Answer

They store and transmit genetic information from one generation to the next.

Question 18

Which of the following is true about the structure of a DNA double helix?

Accepted Answer

The two strands are held together by hydrogen bonds between complementary bases.

Question 19

Which of the following best explains why the primary structure of a protein is more stable than its tertiary structure?

Accepted Answer

The primary structure is stabilized by strong covalent peptide bonds, while tertiary structure is stabilized by weaker interactions like hydrogen bonds and ionic interactions.

Proteins and Nucleic Acids: Structure, Function, and Biological Importance

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