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Molecular Biology Chapter on Gene Expression

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Questions and Answers

What is the primary effect of alternative splicing on gene expression?

It increases the number of genes in the genome.
It enhances the transcription process of RNA.
It produces different isoforms of mRNA from the same RNA transcript. (correct)
It permanently alters the DNA sequence of a gene.

How does RNA interference (RNAi) primarily affect mRNA?

It promotes the splicing of introns from mRNA.
It stabilizes mRNA in the nucleus.
It destroys mRNA or blocks its translation. (correct)
It enhances the translation of mRNA into proteins.

Which component is responsible for the unwinding of double stranded miRNA in RNA interference?

Alternative splicing factors
Precursor miRNA Binding Complex
RISC helicase activity (correct)
mRNA stability regulators

What role do proteins that interact with spliceosomes play in alternative splicing?

<p>They determine which exon sequences are included or excluded in splicing. (D)</p> Signup and view all the answers

What is the result of the RISC binding to complementary mRNA during the RNA interference process?

<p>It leads to the cutting of the complementary mRNA and prevents its translation. (A)</p> Signup and view all the answers

Flashcards

Alternative Splicing

Different ways a gene's mRNA can be spliced, creating multiple protein versions (isoforms).

mRNA Stability

How long mRNA lasts in the cell and its effect on protein production.

RNA Interference (RNAi)

Mechanism to destroy mRNA or block translation, preventing protein creation.

miRNA Processing Steps

Stages of creating miRNA from a gene to bind to mRNA and halt translation.

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miRNA Function

miRNAs bind to mRNA to block translation or cause mRNA degradation.