Question 1

Which of the following best explains why DNA is more chemically stable than RNA?

Accepted Answer

DNA contains deoxyribose, which lacks a hydroxyl group at the 2' carbon, making it less reactive than ribose in RNA.

Question 2

During DNA replication, which base pairs with cytosine (C) and how many hydrogen bonds are formed between them?

Accepted Answer

Guanine (G); three hydrogen bonds

Question 3

Which of the following statements about the directionality of nucleic acid strands is correct?

Accepted Answer

Nucleic acid strands grow from the 5' end to the 3' end, with the 5' end having a free phosphate group.

Question 4

Which of the following is a correct description of the Central Dogma of Molecular Biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into proteins.

Question 5

A scientist discovers a nucleic acid molecule with the following characteristics: contains uracil, has a ribose sugar, and is single-stranded. What type of molecule is this?

Accepted Answer

RNA

Question 6

Which of the following best describes a gene?

Accepted Answer

A segment of DNA that encodes instructions for synthesizing a specific protein or functional RNA molecule.

Question 7

What is the main difference between thymine and uracil, and how does this affect their respective roles in DNA and RNA?

Accepted Answer

Thymine has a methyl group (-CH3) that uracil lacks, making DNA more stable and suitable for long-term genetic storage.

Question 8

If a gene is 100 bases long, how many possible unique sequences can be formed using the four nucleotide bases?

Accepted Answer

$$4^{100}$$

Question 9

Which of the following best describes the backbone of a DNA molecule?

Accepted Answer

Alternating pentose sugars and phosphate groups linked by phosphodiester bonds

Question 10

During transcription, which base in RNA pairs with adenine in DNA?

Accepted Answer

Uracil

Question 11

Which of the following is true about the antiparallel nature of DNA?

Accepted Answer

One strand runs from 5' to 3', while the other runs from 3' to 5'.

Question 12

Which of the following is a function of the major groove in the DNA double helix?

Accepted Answer

It allows DNA-binding proteins to recognize specific base sequences.

Question 13

Which process involves copying the entire DNA molecule to ensure each daughter cell receives a complete set of genetic information?

Accepted Answer

Replication

Question 14

Which of the following statements about RNA structure is correct?

Accepted Answer

RNA is single-stranded and contains uracil.

Question 15

Which type of bond connects the 3' carbon of one nucleotide to the 5' carbon of the next in a nucleic acid strand?

Accepted Answer

Phosphodiester bond

Question 16

Which of the following best describes the genome of an organism?

Accepted Answer

The complete set of DNA, including both coding and non-coding regions, across all chromosomes.

Question 17

Which of the following is a pyrimidine base found in RNA but not in DNA?

Accepted Answer

Uracil

Question 18

Which of the following scenarios best illustrates the importance of complementary base pairing in DNA replication?

Accepted Answer

Each new DNA strand is synthesized using the original strand as a template, ensuring accurate copying of genetic information.

Question 19

Which of the following is true regarding the role of RNA in protein synthesis?

Accepted Answer

RNA carries genetic instructions from DNA to ribosomes, where it directs the synthesis of proteins.

Nucleic Acids and the Origin of Life: Structure and Function

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