AP Ch Quiz Ch 16 Gene Regulation
Hello everyone and welcome to “AP Ch Quiz Ch 16 Gene Regulation”, where we’ll be looking at the topic of AP Chemistry with specific reference to Gene Regulation – which is the process of controlling which specific genes in a cell’s DNA are expressed. What do you know about it?
- 1.Which statement is NOT correct about the lac operon?
- A.
It regulates the production of a series of five enzymes.
- B.
It is normally turned off if glucose is present.
- C.
Lactose binds to the repressor protein and inactivates it.
- D.
It is an inducible system.
- E.
The structural genes make products that allow lactose metabolism.
- 2.Which statement is NOT correct about the trp operon?
- A.
The structural genes make products that act in a metabolic pathway to produce tryptophan.
- B.
It is normally turned off if tryptophan is present.
- C.
Tryptophan acts as the corepressor.
- D.
The regulator gene product is inactive by itself.
- E.
Tryptophan binds to the repressor protein and inactivates it.
- 3.Which level of primary control in eukaryotic gene activity involves the life span of the mRNA molecule and the ability of the mRNA to bind to ribosomes?
- A.
Feedback control
- B.
Translational control
- C.
Transcriptional control
- D.
Posttranscriptional control
- E.
Posttranslational control
- 4.Which level of primary control in eukaryotic gene activity involves processing early RNA transcripts to mRNA and control of the rate at which mRNA leaves the nucleus?
- A.
Feedback control
- B.
Translational control
- C.
Transcriptional control
- D.
Posttranscriptional control
- E.
Posttranslational control
- 5.Which level of primary control in eukaryotic gene activity involves changes in the polypeptide chain before it becomes functional?
- A.
Feedback control
- B.
Translational control
- C.
Transcriptional control
- D.
Posttranscriptional control
- E.
Posttranslational control
- 6.An enhancer site is
- A.
Part of an operon.
- B.
Found only in prokaryotes.
- C.
Located at a distance from the gene it affects.
- D.
An attachment site for RNA polymerase.
- 7."Jumping genes" that have the ability to move within and between chromosomes are called
- A.
Introns.
- B.
Oncogenes.
- C.
Transposons.
- D.
Retroviruses.
- E.
Exons.
- 8.An oncogene is
- A.
A viral gene with no relation to the host cell's genes.
- B.
A mutated form of a proto-oncogene.
- C.
A bacterial gene that causes cancer in the host.
- D.
Always seen in human cancer cells.
- E.
A gene that turns off cellular reproduction.
- 9.The balance between stimulatory signals and inhibitory signals determines whether
- A.
A cell is normal or malignant.
- B.
A cell conducts normal metabolism or undergoes apoptosis.
- C.
Proto-oncogenes are active.
- D.
Tumor-suppressor genes are active.
- E.
Both C and D.
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