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26 Sep 2018

Eukaryotes regulate genes through which of these processes?

A. Transcription factors (activators and repressors)

B. mRNA processing

C. Signals sent between cells

D. Post-translational modifications E. All of these

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Related questions

1. In order for an eukaryotic mRNA to be exported out of the nuclear compartment, it needs to undergo processing. What are these modifications?

a Capping

b Polyadenylation

c Splicing

d ALL of the above are correct

e NONE of the above are correct

2 The role of TFIIH is to:

a Bind to TATA box causing bending of DNA so that other proteins can access the site

b Bind to the RNA polymerase

c Bind to Transcription repressors and activators

d Phosphorylate RNA Polymerase II releasing it from general factors to initiate elongation phase of transcription

3 The following sequence of eukaryotic DNA was used as a TEMPLATE to synthesize an mRNA. What is the sequence of the mRNA (written in the 5’-3’ orientation)?

5’-GGCTACTAGTCAGTCAGG-3’

a 5’-CCTGACTGACTAGTAGCC-3’

b 5’-GGACTGACTGATCATCGG-3’

c 5’-CCGATGATCAGTCAGTCC-3’

d None of the above

1. Tissue-specific patterns are determined by _______

a.

a combination of tissue-specific genes only present in the cells that form the tissue.
b.

a combination of tissue-specific regulatory sequences only present in the cells that form the tissue.
c.

a combination of tissue-specific transcription factors only present in the cells that form the tissue.

d. a combination of tissue-specific silencers only present in the cells that form the tissue.

2. The rate of transcription is determined by all the interactions between activators, repressors, general transcription factors and RNA polymerase.

True

False

2. In eukaryotic cells, _________determine the amount of mRNA arising from a particular gene.

a. transcriptional-level controls

b. RNA processing-level controls

c. translational-level controls

d. replication-level controls

e. b and c

3. In eukaryotic cells, _________determine how a primary transcript is converted to mature mRNA

a. transcriptional-level controls

b. RNA processing-level controls

c. translational-level controls

d. replication-level controls

e. a and d

4. In eukaryotic cells, _________determine when a particular mRNA is actually used in protein synthesis.

a. transcriptional-level controls

b. RNA processing-level controls

c. translational-level controls

d. replication-level controls

e. None of the above because protein synthesis takes place immediately

5. Under what circumstances do cells selectively activate and suppress their genes?

a. at different stages of embryonic development

b. in different tissues

c. exposure to different types of stimuli

d. No such circumstances exist in nature—cells express all their genes throughout life.

e. a, b and c

6. Which statement about the control of gene expression is FALSE?

a. A single gene may be controlled by different transcription factors.

b. A single transcription factor may be necessary for the expression of different genes.

c. Each cell type has a characteristic pattern of gene transcription, which is determined by the particular complement of transcription factors contained in that cell. d. Expression of protein genes is primarily controlled in nucleoli

e. Control of gene transcription is complex and influenced by various circumstances.

7. What is thought to maintain X chromosome inactivation in females?

a. DNA acetylation

b. DNA methylation

c. RNA inactivation

d. Histone methylation

e. None of the above because both X chromosomes are active in females and males.

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