Question 1

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

DNA \rightarrow RNA \rightarrow Protein

Question 2

In eukaryotic cells, where does transcription occur and what is the primary location for translation?

Accepted Answer

Transcription occurs in the nucleus; translation occurs at ribosomes in the cytoplasm or rough ER.

Question 3

What is the function of the TATA box in eukaryotic transcription?

Accepted Answer

It serves as a promoter region where transcription factors bind to initiate transcription.

Question 4

During transcription elongation, in which direction does RNA polymerase II synthesize the new mRNA strand?

Accepted Answer

5' \rightarrow 3'

Question 5

Which sequence signals the termination of transcription in eukaryotic cells?

Accepted Answer

AAUAAA

Question 6

What modifications are made to the ends of eukaryotic pre-mRNA during RNA processing?

Accepted Answer

Addition of a guanine cap at the 5' end and a poly-A tail at the 3' end

Question 7

What is the role of the spliceosome in mRNA processing?

Accepted Answer

It removes introns and joins exons together to form mature mRNA.

Question 8

Alternative splicing allows a single gene to:

Accepted Answer

Encode multiple proteins by combining exons in different ways

Question 9

If a mutation prevents the addition of the 5' cap to pre-mRNA, which of the following is most likely to occur?

Accepted Answer

The mRNA will be degraded quickly and translation will be impaired.

Question 10

Which of the following best explains why eukaryotic cells can produce more types of proteins than the number of protein-coding genes?

Accepted Answer

Alternative splicing of exons allows for multiple protein products from a single gene.

Question 11

A scientist observes that a particular mRNA is missing several exons compared to the original pre-mRNA. What process most likely caused this?

Accepted Answer

RNA splicing

Question 12

Which of the following statements about introns is correct?

Accepted Answer

Introns are noncoding regions that are removed during RNA processing.

Question 13

During transcription, which strand of DNA is used as the template for mRNA synthesis?

Accepted Answer

Template strand

Question 14

Which enzyme is responsible for synthesizing mRNA from a DNA template in eukaryotic cells?

Accepted Answer

RNA polymerase II

Question 15

A mutation in the polyadenylation signal sequence (AAUAAA) would most likely affect which stage of transcription?

Accepted Answer

Termination

Question 16

Which of the following is NOT a function of the 5' cap and poly-A tail added to eukaryotic mRNA?

Accepted Answer

Coding for amino acids in the protein

Question 17

If a gene contains three exons and two introns, how many exons will be present in the mature mRNA after RNA processing?

Accepted Answer

Three

Question 18

Which of the following best describes the directionality of transcription by RNA polymerase II?

Accepted Answer

RNA polymerase II reads the template strand in the 3' \rightarrow 5' direction and synthesizes mRNA in the 5' \rightarrow 3' direction.

Question 19

Which of the following scenarios illustrates the importance of alternative splicing in human health?

Accepted Answer

A gene produces multiple proteins, some of which are essential for muscle function while others are involved in immune response.

DNA to Proteins: Transcription, RNA Processing, and Translation

Study Guide - Practice Questions