Question

MicroRNAs (miRNAs) __________.

MicroRNAs (miRNAs) __________.

are artificial RNAs used to interfere with gene expression

can regulate gene expression at the genomic, posttranscriptional, and translational levels

are examples of eukaryotic riboswitches

are produced by transcription of both strands of a DNA sequence

Which of the following is NOT an example of genomic control of gene regulation?

Which of the following is NOT an example of genomic control of gene regulation?

DNA methylation

alternative RNA splicing

DNA rearrangement

gene amplification

Based on mode of action, which eukaryotic transcriptional regulator is most similar to the cAMP receptor protein (CRP)?

the cyclic AMP response element-binding protein (CREB)

the glucocorticoid receptor (GR)

a zinc finger protein

the heat-shock transcription factor

Answer 1

1 The process of turning on and off of a gene is known as gene regulation.

In the above given examples Gene amplification is not  a mechanism for gene regulation because Gene amplication refers to production of multiple copies of a gene.Without a proportional increase in other genes. Whereas DNA methylation, rnasplicing, and DNA rearrangement are all methods of gene regulation.

22 CREB

Cyclic AMP response element binding protein is a cellular transcription factor it binds to certain DNA sequence called camp response elements. CREB is closely related in structure and function to CREM that is cAMP response element modulator and ATF-1 that is activating transcription factor proteins.