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

Question 1

Which statement best explains why skin, brain, and liver cells can have different functions even though they contain the same DNA?

Accepted Answer

Different cell types turn on or off different genes, leading to the production of different proteins.

Question 2

What is the main function of RNA in the process of gene expression?

Accepted Answer

RNA is the bridge between DNA and protein synthesis.

Question 3

During transcription, which enzyme is responsible for synthesizing RNA from a DNA template?

Accepted Answer

RNA polymerase

Question 4

Which of the following best describes the flow of genetic information in most cells?

Accepted Answer

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

Question 5

How many nucleotide bases are required to specify a single amino acid in the genetic code?

Accepted Answer

Three

Question 6

Which statement about the genetic code is correct?

Accepted Answer

The genetic code is redundant but not ambiguous.

Question 7

What is the role of a promoter in transcription?

Accepted Answer

It is the region of DNA where RNA polymerase attaches to begin transcription.

Question 8

In eukaryotes, what modification occurs to the primary RNA transcript before it is translated?

Accepted Answer

Addition of a 5' cap and a poly-A tail

Question 9

Which process allows a single gene to produce multiple different polypeptides in eukaryotes?

Accepted Answer

Alternative RNA splicing

Question 10

What is the function of spliceosomes in eukaryotic cells?

Accepted Answer

They remove introns and join exons during RNA splicing.

Question 11

A mutation in the coding region of a gene changes the codon from $$	ext{UUA} to$$ $$	ext{UUG}. $$What is the likely effect on the protein produced?

Accepted Answer

The amino acid sequence will remain unchanged because both codons code for leucine.

Question 12

Which of the following is true about transcription in bacteria compared to eukaryotes?

Accepted Answer

In bacteria, translation of mRNA can begin before transcription is finished.

Question 13

What would be the consequence of a mutation that disrupts the polyadenylation signal sequence in a eukaryotic gene?

Accepted Answer

The RNA transcript would not be properly released, affecting mRNA stability and translation.

Question 14

Which of the following best describes the relationship between genotype and phenotype?

Accepted Answer

Proteins are the link between genotype and phenotype.

Question 15

If the template DNA strand has the sequence $$5'\ 	ext{ATGCTAAG}\ 3'$$, what is the sequence of the complementary RNA produced during transcription?

Accepted Answer

$$5'\ 	ext{UACGAUUC}\ 3'$$

Question 16

Which of the following is NOT a function of transcription factors in eukaryotic cells?

Accepted Answer

Initiating the process of translation

Question 17

Why is it important for codons to be read in the correct reading frame during translation?

Accepted Answer

To produce the correct polypeptide sequence.

Question 18

Which of the following statements about the universality of the genetic code is correct?

Accepted Answer

Genes from one species can be transcribed and translated in another species.

Question 19

What is the main reason for having RNA as an intermediate between DNA and protein?

Accepted Answer

RNA allows for regulation and processing before protein synthesis.

Question 20

Which of the following is a direct result of alternative RNA splicing in eukaryotic cells?

Accepted Answer

Production of multiple polypeptides from a single gene

Gene Expression: From Gene to Protein (Transcription and RNA Processing)

Study Guide - Practice Questions