Question

Place these events that occur during protein synthesis in the proper sequence

- I. II. III. IV.	An aminoacyl-tRNA binds to the A site
- I. II. III. IV.	A peptide bond forms between the new amino acid and a polypeptide chain
- I. II. III. IV.	tRNA leaves the P site and the P site remains vacant
- I. II. III. IV.	tRNA translocates (moves) to the P site

Bacterial are very responsive to changes in their environments. How can bacteria control metabolic pathways in response to changes in nutrient availability?

controlling the expression levels of key genes

feedback inhibition of key enzymes in pathways

by post-translating modifying key enzymes to control their activity

by allosteric changes in regulatory proteins

by mutating their genes in response to their environment

How do the life cycles of most fungi differ from those of plants?

		fungi never produce a multicellular haploid organism
		fungi do not have a diploid stage
		Meiosis in fungi results in gametes, while plants produce gametes by mitosis
		Meiosis occurs in fungi without a multicellular diploid offspring developing

Why are proteins so incredibly diverse in structure and function?

		They are made by combining four different types of nucleic acids
		They can be made out of 20 different amino acids
		They contain both saturated and unsaturated fats
		They are long multi-branched simple carbon chains

I.	second
II.	4th
III.	3rd
IV.	first