The number of protein-coding genes is less than the number of potential polypeptides that can result in several polypeptides from the same gene because of mechanisms 

A. alternative splicing

B. alternate promoter selection, 

C. alternate poly(A) site selection

D. Number of Introns in the gene

#Question id: 8888

#Unit 9. Diversity of Life Forms

#Question id: 3867

#Unit 3. Fundamental Processes

RNA polymerase from E. coli (core enzyme alone) has all of the following properties except that it:

#Question id: 4592

#Unit 11. Evolution and Behavior

Which of the following statements describe the effect of evolution on a population?

#Question id: 3521

#Unit 8. Inheritance Biology

Which of the following is incorrect about independent assortment?

#Question id: 2910

#Unit 2. Cellular Organization

With respect to the DNA methylation mechanism in mammalian cells, which of the following statements, if any, is true? 

I. The principal role of the DNMT1 DNA methyltransferase is in de novo methylation. 

II. The DNMT3A and DNMT3B DNA methyltransferases require hemi-methylated DNA as a substrate and are responsible for methylating nascent DNA strands that are complementary to methylated parental DNA strands.

III. Active DNA demethylation means removal of methyl groups from a hemi-methylated DNA double helix. 

IV. DNA methylation is not essential in mammalian development.