Q: Which of the following best describes the Central Dogma of Molecular Biology?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

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

Accepted Answer

DNA lacks a hydroxyl group at the 2' carbon of its sugar, making it less reactive than RNA.

Question 2

During DNA replication, which type of bond is broken to allow the two strands to separate?

Accepted Answer

Hydrogen bonds between complementary nitrogenous bases

Question 3

A scientist is analyzing a nucleic acid and finds it contains the bases adenine, cytosine, guanine, and uracil. Which type of molecule is she most likely studying?

Accepted Answer

An RNA molecule

Question 4

Which of the following correctly describes the directionality of a nucleic acid strand?

Accepted Answer

It grows from the 5' end to the 3' end, with a free phosphate group at the 5' end.

Question 5

Which of the following best describes the Central Dogma of Molecular Biology?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 6

A mutation changes a cytosine (C) to a thymine (T) in a DNA sequence. Which of the following base-pairing changes would you expect in the double helix as a result?

Accepted Answer

The mutated T will pair with A via two hydrogen bonds.

Question 7

Which of the following statements about the structure of DNA is correct?

Accepted Answer

The two strands of DNA are antiparallel, running in opposite directions.

Question 8

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

Accepted Answer

It allows DNA-binding proteins to access specific base sequences for gene regulation.

Question 9

Which of the following best explains why uracil is found in RNA but not in DNA?

Accepted Answer

Uracil is less stable than thymine, making it suitable for RNA's temporary roles.

Question 10

A gene is best defined as:

Accepted Answer

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

Question 11

Which of the following is true about the process of transcription?

Accepted Answer

It uses a DNA template to synthesize a complementary RNA strand.

Question 12

Which of the following best describes a phosphodiester bond?

Accepted Answer

A covalent bond between the 3' hydroxyl group of one nucleotide and the 5' phosphate group of the next nucleotide.

Question 13

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

Accepted Answer

3'-TAGC-5'

Question 14

Which of the following statements about genomes is correct?

Accepted Answer

A genome is the complete set of DNA within a living organism, including both coding and non-coding regions.

Question 15

Which of the following is a real-world consequence of the sequence of nucleotide bases in a gene?

Accepted Answer

It determines the sequence of amino acids in a protein, which affects the protein's structure and function.

Question 16

Which of the following best describes the difference between a nucleoside and a nucleotide?

Accepted Answer

A nucleoside consists of a nitrogenous base and a pentose sugar, while a nucleotide also includes one or more phosphate groups.

Question 17

Which of the following is a correct pairing of purines and pyrimidines in DNA?

Accepted Answer

Adenine (A) pairs with Thymine (T) via two hydrogen bonds.

Question 18

Which of the following best explains why the sequence of bases in DNA can encode a vast amount of genetic information?

Accepted Answer

There are four possible bases at each position, so the number of possible sequences increases exponentially with length.

Question 19

Which of the following is a direct result of the antiparallel arrangement of DNA strands?

Accepted Answer

DNA polymerases can only add nucleotides to the 3' end during replication.

Question 20

A patient is diagnosed with a genetic disorder caused by a mutation in a single gene. Which of the following best explains how this mutation can lead to disease?

Accepted Answer

The mutation changes the sequence of nucleotide bases, which alters the amino acid sequence of the protein, potentially affecting its function.

Nucleic Acids and the Origin of Life: Structure, Function, and Information Flow

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드