Question

1. Alternative RNA splicing ________.

a. is due to the presence or absence of particular snRNPs

b. can allow the production of similar proteins from different genes

c. is a mechanism for modifying a single protein product

d. increases the rate of transcription

e. can allow the production of proteins of different sizes and functions from a single mRNA

2.

An enhancer _____.

	a.	functions within a promoter
	b.	is the same thing as a promoter
	c.	acts at a distance from the promoter
	d.	is considered to be 'promoter-proximal'

Answer 1

1. E

Splicing iw the process of removal of non coding sequences from messenger RNA and joining of coding sequences.

Non-coding sequences are introns and coding sequences are exons.

In case of constitutive splicing, all the introns are removed and exons are joined together in a one-to-one manner.

In alternative splicing introns and exons are are joined together in different combinations resulting in the formation of different types of messenger. Each messenger RNA can give rise to a new type of protein therefore by the process of alternative splicing, a single gene can give rise to different types of protein molecules.

2. C

Enhancers are the egulatory elements which can be located upstream or downstream of the gene which they regulate.

They are mostly located very far from the associated gene.

They bind to proteins called as activators to increase the rate of transcription of the associated gene.

Please give a good rating.