Multiple Choice
What does it mean to say that a gene is expressed?
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16. Regulation of Expression
Introduction to Regulation of Gene Expression
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How does siRNA and its associated enzyme regulate gene expression?
A
By binding to DNA and blocking transcription.
B
By degrading mRNA after transcription, preventing translation.
C
By modifying histones to increase chromatin accessibility.
D
By enhancing the binding of RNA polymerase to the promoter region.
Verified step by step guidance1
Understand that siRNA stands for small interfering RNA, which is a class of double-stranded RNA molecules involved in the RNA interference (RNAi) pathway.
Recognize that siRNA does not bind to DNA directly; instead, it interacts with mRNA molecules post-transcription.
Learn that siRNA is incorporated into a protein complex known as the RNA-induced silencing complex (RISC).
Know that the RISC, guided by the siRNA, binds to complementary mRNA sequences.
Realize that once bound, the RISC-siRNA complex degrades the mRNA, preventing it from being translated into a protein, thus regulating gene expression by reducing the levels of specific proteins.
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