Question 1

Which of the following best describes the genetic code?

Accepted Answer

A set of rules by which information encoded in DNA is translated into proteins by living cells.

Question 2

Which type of mutation is most likely to result in a nonfunctional protein due to a premature stop codon?

Accepted Answer

Nonsense mutation

Question 3

During DNA replication, which enzyme is primarily responsible for adding nucleotides to the growing DNA strand?

Accepted Answer

DNA polymerase

Question 4

Which of the following best explains the relationship between codons, anticodons, and amino acids?

Accepted Answer

Codons in mRNA pair with anticodons in tRNA, which carry specific amino acids for protein synthesis.

Question 5

A mutation changes the DNA sequence from $$	ext{TAC} to$$ $$	ext{TAG}. $$What is the most likely effect on the resulting protein?

Accepted Answer

A stop codon is introduced, leading to a truncated protein.

Question 6

Which process describes the synthesis of RNA from a DNA template?

Accepted Answer

Transcription

Question 7

Which of the following is a real-world example of gene regulation in humans?

Accepted Answer

Lactose intolerance due to the silencing of the lactase gene in adulthood.

Question 8

What is the primary function of tRNA during translation?

Accepted Answer

To bring specific amino acids to the ribosome based on the codon sequence of mRNA.

Question 9

Which experiment provided evidence that DNA is the genetic material?

Accepted Answer

The Hershey-Chase experiment using bacteriophages and radioactive labeling.

Question 10

A patient has a genetic disorder caused by a single base substitution in a gene. Which type of mutation is this?

Accepted Answer

Point mutation

Question 11

Which of the following best describes the process of cell differentiation?

Accepted Answer

The process by which unspecialized cells become specialized in structure and function.

Question 12

Which enzyme is responsible for joining Okazaki fragments during DNA replication?

Accepted Answer

DNA ligase

Question 13

If a DNA strand has the sequence $$5'	ext{-ATGCGT-}3'$$, what is the complementary RNA sequence produced during transcription?

Accepted Answer

$$5'	ext{-UACGCA-}3'$$

Question 14

Which of the following statements about silent mutations is correct?

Accepted Answer

They do not change the amino acid sequence of the resulting protein.

Question 15

Which process is directly responsible for the synthesis of proteins from mRNA?

Accepted Answer

Translation

Question 16

A frameshift mutation is most likely to occur as a result of which of the following?

Accepted Answer

Insertion or deletion of a nucleotide

Question 17

Which of the following best explains why gene expression must be regulated in multicellular organisms?

Accepted Answer

To ensure that different cell types express only the genes necessary for their function.

Genetic Code, Mutations, and Gene Expression: Study Notes

Study Guide - Practice Questions