Question 1

Which of the following best describes the difference between DNA and RNA nucleotides?

Accepted Answer

DNA nucleotides have a deoxyribose sugar, while RNA nucleotides have a ribose sugar.

Question 2

Which equation correctly represents the complementary base pairing in DNA?

Accepted Answer

$$A = T$$, $$C = G$$

Question 3

During DNA replication, which enzyme is responsible for synthesizing the new DNA strand by adding nucleotides to the growing chain?

Accepted Answer

DNA polymerase

Question 4

Which of the following best explains the difference between the leading and lagging strands during DNA replication?

Accepted Answer

The leading strand is synthesized continuously, while the lagging strand is synthesized discontinuously in Okazaki fragments.

Question 5

Which process is most similar to the natural biological replication of DNA, but is performed in vitro to amplify specific DNA sequences?

Accepted Answer

Polymerase Chain Reaction (PCR)

Question 6

Which of the following correctly summarizes the central dogma of molecular biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 7

A mutation changes a codon from $$GAA to$$ $$GAG. $$What effect will this have on the protein sequence?

Accepted Answer

It will likely have no effect because both codons code for glutamic acid (silent mutation).

Question 8

Which of the following best describes the role of ribosomes in translation?

Accepted Answer

Ribosomes catalyze the formation of peptide bonds between amino acids during protein synthesis.

Question 9

Which of the following is NOT a step in the processing of primary mRNA transcripts in eukaryotes?

Accepted Answer

Removal of exons

Question 10

Which of the following best explains why all cells in an individual are genetically identical, yet have distinct functions and characteristics?

Accepted Answer

Cells express different sets of genes due to differential gene regulation.

Question 11

Which of the following describes the function of enhancer regions in gene expression?

Accepted Answer

Enhancers are DNA sequences that increase the transcription of associated genes by binding transcription factors.

Question 12

A mutation in the enhancer region of the lactase gene in humans can lead to which phenotype?

Accepted Answer

Increased lactose intolerance in adulthood

Question 13

Which of the following is a post-transcriptional mechanism for controlling gene expression?

Accepted Answer

Alternative splicing of mRNA

Question 14

Which chemical modification is commonly associated with epigenetic silencing of genes?

Accepted Answer

Methylation of DNA at cytosine residues

Question 15

How does the epigenome contribute to cellular memory?

Accepted Answer

By regulating gene expression through reversible chemical modifications that are inherited during cell division.

Question 16

Which of the following best describes the role of tRNA in translation?

Accepted Answer

tRNA carries amino acids to the ribosome and matches them to the mRNA codon via its anticodon.

Question 17

Which of the following is a consequence of a frameshift mutation in a coding region of DNA?

Accepted Answer

The reading frame of the gene is altered, potentially changing every amino acid downstream.

Question 18

Which formula would you use to predict the number of possible codons in the genetic code, given four different nucleotides and codons of length three?

Accepted Answer

$$4^3$$

Question 19

Which of the following is true regarding the difference between biological DNA replication and PCR?

Accepted Answer

PCR requires repeated heating and cooling cycles, while biological replication occurs at a constant temperature.

Molecular Biology and Genetics: Structure, Function, and Regulation of DNA

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드