Q: Which equation best represents the process of transcription in eukaryotic cells?

$$\text{DNA} \xrightarrow{\text{RNA polymerase}} \text{mRNA}$$

Question 1

Which of the following best describes the process by which insulin becomes a functional protein in human cells?

Accepted Answer

Insulin is produced as preproinsulin, which undergoes cleavage at the N-terminus to form proinsulin, then further cleavage and disulfide bond formation to yield active insulin.

Question 2

What is the primary function of the signal sequence found at the N-terminus of many newly synthesized polypeptides?

Accepted Answer

To direct the polypeptide to its correct cellular location, such as the endoplasmic reticulum.

Question 3

During gene expression in eukaryotes, which of the following correctly describes the flow of genetic information according to the central dogma?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 4

A mutation occurs in the signal sequence of a secreted protein. Which cellular process is most likely to be affected?

Accepted Answer

Transport of the protein to the endoplasmic reticulum

Question 5

Which of the following statements about mRNA vaccines is TRUE?

Accepted Answer

mRNA vaccines are manufactured in a cell-free manner, allowing rapid and scalable production.

Question 6

Which equation best represents the process of transcription in eukaryotic cells?

Accepted Answer

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

Question 7

A researcher is designing an mRNA vaccine for a new virus. Which step is NOT required in the process?

Accepted Answer

Integrating the mRNA into the host cell's genome

Question 8

Which of the following is a direct result of post-translational cleavage of polypeptides?

Accepted Answer

Generation of multiple functional protein segments from a single polypeptide precursor

Question 9

In the context of mRNA vaccine technology, what is the main advantage of using modified nucleosides?

Accepted Answer

They reduce immune recognition and increase mRNA stability.

Question 10

Which of the following best explains why mRNA vaccines do not cause permanent genetic changes in human cells?

Accepted Answer

mRNA is rapidly degraded and does not enter the nucleus.

Question 11

A patient has a genetic mutation that prevents the formation of disulfide bonds in proinsulin. What is the most likely consequence?

Accepted Answer

Insulin will not form its correct three-dimensional structure and will be nonfunctional.

Question 12

Which process is responsible for converting the DNA template strand $$5'	ext{TACCACAACTCG}3'$$ into the mRNA sequence $$5'	ext{AUGGUGUUGAGC}3'$$?

Accepted Answer

Transcription

Question 13

Which of the following is NOT a function of ribosomal RNA (rRNA) in the cell?

Accepted Answer

Carrying amino acids to the ribosome

Question 14

A scientist is studying the effect of a mutation in the gene encoding a signal sequence. Which experimental result would best support the hypothesis that the signal sequence is necessary for ER localization?

Accepted Answer

The mutated protein is found in the cytosol instead of the ER.

Question 15

Which of the following steps occurs FIRST during the synthesis of a secreted protein?

Accepted Answer

Binding of the ribosome to the ER membrane via the signal recognition particle

Question 16

Which of the following is a key reason why mRNA vaccines can be produced rapidly compared to traditional vaccines?

Accepted Answer

They do not require cell culture or viral growth; mRNA is synthesized in vitro.

Question 17

Which of the following best describes the role of transfer RNA (tRNA) during translation?

Accepted Answer

tRNA carries specific amino acids to the ribosome and matches them to codons in the mRNA.

Question 18

Which of the following is a plausible consequence of a mutation that prevents cleavage of preproinsulin at the N-terminus?

Accepted Answer

Preproinsulin will accumulate and fail to form functional insulin.

Question 19

Which of the following is TRUE regarding the translation of proteins destined for secretion?

Accepted Answer

Translation begins on free ribosomes, but the presence of a signal sequence directs the ribosome to the ER membrane for completion.

Gene Expression, Protein Processing, and mRNA Technology: Genetics Study Notes

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