Question

1. Small RNAs that are complementary to mRNA and target it for degradation are known as

a. miRNA

b. tRNA

c. rRNA

d. mRNA

2. When the inducer is absent, the ___________ binds to the operator and no mRNA is synthesized.

a. repressor b. promoter. c. agitator d. combiner

3. Methylated nucleotides are not transcribed in epigenetic control.

TRUE or FALSE

Answer 1

Ans 1-) miRNA is the correct option.

micro RNA are found in viruses, animals and plants. They are defined as the molecule of RNA which is non coding and they functions in silencing of RNA and they play a major role in the post transcriptional regulation. micro RNA base pair with the sequences which are complementary within the mRNA molecule.

Ans 2-) Repressor is the correct option.

In lac operon, the repressor gene will transcribe the repressor protein which is in its active state. And inducer which is a lactose is absent, then this repressor protein will bind to the operator region and not allow the RNA polymerase to sit on the operator region thus RNA polymerase cannot bind to promoter and thus prevent mRNA from transcribing the gene.

Ans 3-) The statement is False.

DNA methylation is a form of epigenetic control will regulate the expression of gene. By the process of DNA methylation, the epigenetic marking of DNA is heritable and stable that will allow the methylated DNA to get transcribed.