biology : class11 Hormone Response Elements : Receptors, Second Messengers, Gene Regulation : Hormone Action MCQ Questions and Answers
Practice important
Hormone Response Elements
MCQ questions and answers.
Page 1
of
1
|
10
MCQ Questions
1. What is a hormone response element (HRE)?
A.
A specific DNA sequence that binds a hormone-receptor complex
B.
A protein that transports hormones in blood
C.
An enzyme that breaks down hormones
D.
A membrane channel that allows hormones to enter cells
Correct Answer:
A specific DNA sequence that binds a hormone-receptor complex
Explanation:
A hormone response element is a particular DNA sequence recognized by a hormone-bound receptor to regulate gene transcription.
2. Where are hormone response elements usually found?
A.
Near genes regulated by the hormone
B.
Only inside ribosomes
C.
Inside the lipid bilayer of the cell membrane
D.
Only within the cytoplasm
Correct Answer:
Near genes regulated by the hormone
Explanation:
HREs are DNA sequences located near target genes, where hormone-receptor complexes can influence transcription.
3. What binds directly to a hormone response element?
A.
A hormone-receptor complex
B.
A free hormone molecule alone
C.
A ribosome
D.
A messenger RNA molecule
Correct Answer:
A hormone-receptor complex
Explanation:
The receptor binds the hormone and then recognizes and attaches to the specific HRE sequence in DNA.
4. What is the main effect of a hormone-receptor complex binding to an HRE?
A.
It can regulate transcription of a target gene
B.
It directly produces ATP
C.
It digests the DNA molecule
D.
It converts RNA into a lipid
Correct Answer:
It can regulate transcription of a target gene
Explanation:
Binding to an HRE allows the hormone-receptor complex to increase or decrease transcription of nearby target genes.
5. Hormone response elements are made of which type of biological molecule?
A.
DNA
B.
Protein
C.
Lipid
D.
Carbohydrate
Correct Answer:
DNA
Explanation:
An HRE is a specific nucleotide sequence within DNA that is recognized by a hormone-receptor complex.
6. Why can a hormone-receptor complex affect only certain genes?
A.
Only some genes contain the matching hormone response element
B.
All genes are always equally affected by every hormone
C.
Hormones can bind directly to every protein in the cell
D.
Only genes outside the nucleus can respond
Correct Answer:
Only some genes contain the matching hormone response element
Explanation:
A hormone-receptor complex regulates genes that have a compatible HRE sequence near them.
7. Which event occurs when a receptor recognizes its hormone response element?
A.
The receptor binds to a specific DNA sequence
B.
The DNA is immediately removed from the nucleus
C.
The receptor changes into a ribosome
D.
The HRE is converted into a hormone
Correct Answer:
The receptor binds to a specific DNA sequence
Explanation:
Recognition of an HRE involves the hormone-bound receptor attaching to its matching sequence in DNA.
8. A gene has an HRE that matches a particular hormone-receptor complex. What is most likely to happen?
A.
The gene's transcription may be regulated
B.
The gene must be permanently deleted
C.
The gene is changed into a protein immediately
D.
The gene can no longer contain DNA
Correct Answer:
The gene's transcription may be regulated
Explanation:
A matching HRE provides a site through which the hormone-receptor complex can control transcription of the associated gene.
9. What gives a hormone-receptor complex its DNA-binding specificity at an HRE?
A.
Recognition of a particular DNA sequence
B.
Random movement through the cytoplasm
C.
The color of the hormone
D.
The number of ribosomes in the cell
Correct Answer:
Recognition of a particular DNA sequence
Explanation:
The receptor recognizes the nucleotide sequence of its specific HRE, allowing selective regulation of target genes.
10. If a hormone response element near a target gene is altered, what may happen?
A.
The hormone-receptor complex may bind less effectively
B.
The hormone will always bind more strongly to every receptor
C.
All genes in the cell will be activated
D.
The receptor will automatically become a carbohydrate
Correct Answer:
The hormone-receptor complex may bind less effectively
Explanation:
Changing the DNA sequence of an HRE can prevent or weaken recognition by the hormone-receptor complex, affecting target-gene transcription.
Short Questions and Answers
Practice short questions and answers related to
Hormone Response Elements
.
Short questions are currently unavailable for this page.