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

Question 1

Which of the following best describes the process of transcription in cells?

Accepted Answer

Transcription is the synthesis of RNA from a DNA template.

Question 2

During translation, what is the primary role of tRNA molecules?

Accepted Answer

tRNA molecules bring amino acids to the ribosome.

Question 3

Which sequence is commonly found at the -10 position of bacterial promoters and is crucial for transcription initiation?

Accepted Answer

TATAAT

Question 4

In the context of gene expression, which process involves a change in 'language' from nucleotides to amino acids?

Accepted Answer

Translation

Question 5

Which of the following is a correct representation of the central dogma of molecular biology?

Accepted Answer

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

Question 6

Which of the following statements about RNA polymerase in eukaryotes is TRUE?

Accepted Answer

Eukaryotic cells have multiple RNA polymerases, each responsible for different types of RNA.

Question 7

A mutation in the TATA box of a eukaryotic promoter would most likely affect which stage of transcription?

Accepted Answer

Initiation

Question 8

Which of the following best explains why supercoiling does not occur during transcription?

Accepted Answer

RNA polymerase unwinds the DNA and immediately rewinds it behind itself.

Question 9

In bacterial transcription termination, what is the role of the hairpin loop structure formed in the RNA?

Accepted Answer

It causes RNA polymerase to pause and release the RNA transcript.

Question 10

Which of the following is a direct result of enhancer activity in eukaryotic gene regulation?

Accepted Answer

Enhancers facilitate chromatin remodeling and increase transcription.

Question 11

A patient has a mutation in the MCM6 enhancer region affecting lactase gene expression. Which of the following is the most likely outcome?

Accepted Answer

Developmental downregulation of the LCT gene and reduced lactase production after weaning.

Question 12

Which of the following correctly matches the RNA type with its function?

Accepted Answer

tRNA: brings amino acids to the ribosome during translation

Question 13

Which of the following is a consequence of DNA methylation in the context of gene regulation?

Accepted Answer

Increased chromatin condensation and gene silencing

Question 14

Which of the following is TRUE regarding the direction of RNA synthesis by RNA polymerase?

Accepted Answer

RNA is synthesized in the 5' to 3' direction.

Question 15

Which of the following is a function of the poly(A) tail added to eukaryotic mRNAs?

Accepted Answer

It facilitates mRNA export from the nucleus and increases stability.

Question 16

A researcher discovers a new inhibitor that specifically blocks RNA polymerase II. Which process would be most directly affected?

Accepted Answer

Synthesis of mRNA

Question 17

Which of the following is a key difference between prokaryotic and eukaryotic transcription?

Accepted Answer

Eukaryotic transcription requires multiple transcription factors for initiation.

Question 18

Which of the following sequences is most likely to be found upstream of the transcription start site in a eukaryotic gene?

Accepted Answer

TATA box

Question 19

Which of the following best describes the role of transcription factors in eukaryotic gene expression?

Accepted Answer

Transcription factors are required for RNA polymerase binding to the promoter.

Question 20

A mutation causes the loss of the initiator (Inr) sequence in a eukaryotic gene. What is the most likely effect?

Accepted Answer

Transcription will fail to initiate at the correct start point.

Gene Expression: Transcription and Translation (Chapter 18 Study Notes)

Guida di studio - Domande di pratica