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

Answer 1

Ans : Proper sequence of protein synthesis are :

1. An aminoacyle - tRNA binds to the A- site

2. A peptide bond forms between the new amino acid and a polypeptide chain

3. tRNA translocates ( moves) to the p site.

4. tRNA leaves the P site and the P site remains vacant.

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

Ans: Feedback inhibition of key enzyme in the pathways

Controlling the expression levels of key genes

By post- translating modifying key enzymes to control their activity.

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

Ans : Meiosis occurs in fungi without a multicellular diploid offspring developing.

Q . Why are proteins so incredibly diverse in structure and function?

Ans : They can be made out of 20 different amino acids.