Q: The Central Dogma of molecular biology describes the flow of genetic information. Which sequence correctly represents this flow?

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

Question 1

Which of the following correctly describes the three components of a nucleotide?

Accepted Answer

A five-carbon sugar, a phosphate group, and a nitrogenous base

Question 2

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

Accepted Answer

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

Question 3

A scientist is analyzing a nucleic acid and finds that it contains the bases adenine, guanine, cytosine, and uracil. Which type of nucleic acid is this most likely to be?

Accepted Answer

RNA

Question 4

Which of the following base pairs is correct according to the rules of complementary base pairing in DNA?

Accepted Answer

Guanine (G) pairs with Cytosine (C)

Question 5

Which of the following statements about the sugar-phosphate backbone of nucleic acids is TRUE?

Accepted Answer

It is formed by phosphodiester linkages between the 3' and 5' carbons of adjacent sugars

Question 6

A DNA strand has the sequence 5'-ATCGGTA-3'. What is the sequence of the complementary strand?

Accepted Answer

3'-TAGCCAT-5'

Question 7

Which of the following best describes the directionality of nucleic acids?

Accepted Answer

Nucleic acids are synthesized from the 5' to 3' direction

Question 8

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

Accepted Answer

Thymine (T)

Question 9

The Central Dogma of molecular biology describes the flow of genetic information. Which sequence correctly represents this flow?

Accepted Answer

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

Question 10

Which of the following statements about RNA is correct?

Accepted Answer

RNA is more diverse in size, shape, and reactivity than DNA

Question 11

A mutation causes a DNA molecule to lose its ability to form hydrogen bonds between bases. Which level of structure would be most directly affected?

Accepted Answer

Secondary structure

Question 12

Which of the following best explains why nucleoside triphosphates (NTPs) are important for nucleic acid polymerization?

Accepted Answer

They provide the energy required for the formation of phosphodiester bonds

Question 13

Which of the following is a correct statement about the antiparallel nature of DNA?

Accepted Answer

The two strands run in opposite directions, one 5' to 3' and the other 3' to 5'

Question 14

Which of the following best describes the difference between ribose and deoxyribose?

Accepted Answer

Ribose has a hydroxyl group at the 2' carbon, while deoxyribose lacks it

Question 15

A researcher is studying a molecule that can both store genetic information and catalyze chemical reactions. Which molecule is she most likely studying?

Accepted Answer

RNA

Question 16

Which of the following best describes the role of phosphodiester bonds in nucleic acids?

Accepted Answer

They link the 3' carbon of one sugar to the 5' carbon of the next sugar

Question 17

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

Accepted Answer

Adenine (A) is a purine; Thymine (T) is a pyrimidine

Question 18

Which of the following best explains why RNA can have catalytic activity while DNA generally cannot?

Accepted Answer

RNA can fold into complex tertiary structures, allowing it to act as a ribozyme

Question 19

A patient is diagnosed with a genetic disorder caused by a mutation in the sequence of bases in a gene. Which level of nucleic acid structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 20

Which of the following statements about the secondary structure of RNA is correct?

Accepted Answer

RNA can form hairpin loops due to complementary base pairing within the same strand

Nucleic Acids: Structure, Function, and Information Flow

Study Guide - Practice Questions

Study Guide - Flashcards