Question 1

Which of the following best describes the product produced at the complete end of transcription in a eukaryotic cell?

Accepted Answer

A pre-mRNA strand containing both exons and introns

Question 2

Alternative splicing allows a single gene to:

Accepted Answer

Produce multiple different polypeptides by including or excluding certain exons

Question 3

Which of the following is a direct result of RNA interference (RNAi) in eukaryotic cells?

Accepted Answer

Destruction or translational inhibition of specific mRNA molecules

Question 4

A scientist wants to silence a gene in a plant to prevent browning after it is cut. Which technique is most likely used?

Accepted Answer

RNA interference targeting the mRNA of polyphenol oxidase

Question 5

Which of the following statements about microRNAs (miRNAs) is correct?

Accepted Answer

A single miRNA can regulate the expression of many different mRNAs

Question 6

What is the main advantage of post-translational control of gene expression?

Accepted Answer

It allows cells to respond rapidly to environmental changes by activating pre-existing proteins

Question 7

Which of the following best defines a transgenic organism?

Accepted Answer

An organism that contains a gene from a different species

Question 8

A goat is engineered to produce human antithrombin in its milk. Which genetic elements are combined to achieve this?

Accepted Answer

A goat regulatory sequence and a human antithrombin coding sequence

Question 9

Which of the following is NOT a function of small interfering RNAs (siRNAs) and PIWI-interacting RNAs (piRNAs)?

Accepted Answer

Promoting the translation of viral mRNAs

Question 10

Which of the following best explains why genetically modified (GM) crops, such as corn and soybeans, have become widespread in agriculture?

Accepted Answer

They can be engineered for traits like pest resistance and increased yield, benefiting farmers and consumers

Question 11

Which of the following is a correct statement about the relationship between genetically modified organisms (GMOs) and transgenic organisms?

Accepted Answer

All transgenic organisms are GMOs, but not all GMOs are transgenic

Question 12

A patient with antithrombin deficiency is at risk for which of the following medical conditions?

Accepted Answer

Deep vein thrombosis (DVT)

Question 13

Which of the following steps occurs immediately after transcription but before translation in eukaryotic cells?

Accepted Answer

RNA processing, including splicing, capping, and polyadenylation

Question 14

Which of the following is a real-world application of transgenic technology in medicine?

Accepted Answer

Production of human insulin in bacteria for diabetes treatment

Question 15

Which of the following best describes the function of the regulatory sequence in a gene?

Accepted Answer

It controls the timing, location, and amount of gene expression

Question 16

A researcher uses RNA interference to study gene function in a model organism. What is the most likely outcome of this experiment?

Accepted Answer

The expression of the target gene will be reduced or silenced

Question 17

Which of the following modifications is an example of post-translational control of protein activity?

Accepted Answer

Phosphorylation of a protein by a kinase

Question 18

Which of the following is a key reason why alternative splicing is important in multicellular organisms?

Accepted Answer

It increases protein diversity from a limited number of genes

Question 19

A GloFish is an example of a transgenic organism because:

Accepted Answer

It contains a fluorescent protein gene from a marine organism

Question 20

Which of the following equations best represents the process of transcription?

Accepted Answer

$$DNA \xrightarrow{RNA\ polymerase} pre	ext{-}mRNA$$

Regulation of Gene Expression and Applications of Genetic Biotechnology

Study Guide - Practice Questions