Which of the following is not a transcription factor? a) promoter-proximal eleme

Question

Which of the following is not a transcription factor?

a) promoter-proximal element

b) TATA-binding protein (TBP)

c) Activator

d) Repressor

e) all of the options are correct

Which of the following is not a sequence in a DNA molecule?

a) promoter-proximal element

b) mediator

c) enhancer

d) exon

e) promoter

The functioning of activators and enhancers is an example of _____ control of gene expression.

a)chromatin remodeling

b) transcriptional

c) post-transcriptional

d) translational control

e) post-translational control

Imagine that you are studying the control of ?-globin gene expression in immature red blood cells . (Mature red blood cells contain ?-globin protein but lack a nucleus and, therefore, the ?-globin gene.) If you deleted a sequence of DNA outside the protein-coding region of the ?-globin gene and found that this increased the rate of transcription, the deleted sequence likely functions as _____.

a) a promoter

b) a promoter-proximal element

c) an enhancer

d) a silencer

If cells of an individual contain the same set of genes, how do these cells become different from each other during development?

a) Different cell type-specific regulatory elements in DNA are created during development.

b) Different cell type-specific regulatory elements in DNA are selectively lost during development.

c) Differences in extracellular signals received by each cell lead to differences in the types of regulatory proteins present in each cell.

d) Differences develop in promoter sequences that lead to different signals being produced by each type of cell.

Explanation / Answer

The answers are provided in a sequential manner:

a) promoter-proximal element

b) mediator

b) transcriptional

d) a silencer

a) Different cell type-specific regulatory elements in DNA are created during development.

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