Question

1. alternative splicing results in ________

   		more proteins than genes
   		more genes than proteins
   		equal numbers of genes and proteins
   		there is no relationship between splicing and the number of different proteins

2. mRNA splicing is most common in

		bacteria
		complex eukaryotes
		simple eukaryotes
		mitochondria

3. A gene that has an mRNA with a short half-life

		will be translated more than one with a long half-life
		will be translated less than one with a long half-life
		will not be translated at all
		will never be degraded

4. Double stranded RNA plays a role in which form of gene regulation?

		alternate splicing
		repressors
		promoter control
		gene silencing

Answer 1

1. (a) more proteins than genes.

Alternative splicing is a regulated gene process duri gene expression that results in a single gene coding for multiple proteins. In this process, particular exons of a gene maybe excluded from the final or included within the processed mRNA produced from that gene.

2.(b) complex eukaryote

In complex eukaryotes, mRNA splicing is preceded and proceeded by various changes that prepares hnRNA to undergo splicing,that is, the removal of inactive introns and joining of active exons.

3.(a) there is an inverse relationship between mRNA degradation and translation.

4.(d).double stranded RNA plays important roles in silencing transposon and viruses in animal and plant cells .