Question

4. Your liver and heart cells are different because

a. they contain different genes

b. they contain different operons

c. each contains unique promoters

d. different regulatory genes are expressed in different tissues

e. they contain different chromosomes

9. Multi-cistronic (polycistronic) messenger RNAs

a. Are only found in eukaryotic cells and encode genes for the cistronic organelle.

b. Encode transfer RNAs found inside bacterial mitochondria.

c. Distinguish between splice variants during the constitutive growth phase.

d. Is a single messenger RNA encoding multiple, different gene products.

e. Encode a single polypeptide chain.

Answer 1

4. Your liver and heart cells are different because

d. different regulatory genes are expressed in different tissues

In multicellular organisms, cells in different tissues and organs differentiate by synthesising different sets of proteins.

9. Multi-cistronic (polycistronic) messenger RNAs

d. Is a single messenger RNA encoding multiple, different gene products.

Polycistronic mRNA encodes for two or more proteins. Bacterial messenger RNA is generally polycistronic.