Biology Answers

2.3) During translation, an mRNA molecule has a codon with the triplet sequence 5’-AUC-3’. Which anticodon sequence in tRNA molecule would pair with the codon?

1. 3’-AUC-5’
2. 5’-TAG-3’
3. 3’-GAT-5’
4. 3’-UAG-5’

2.3) What kind of bonds joins amino acid in a polypeptide chain?

1. Ionic bonds
2. Peptide bonds
3. Hydrogen bonds
4. Double bonds

2.3) Which part of a ribosome accepts a tRNA molecule that is attached to a growing polypeptide chain?

1. A site
2. P site
3. E site
4. all because the growing polypeptide moves from one site to the other.

2.3) At what region of DNA does RNA polymerase first bind to a gene?

1. Initiation site
2. Transcribed region
3. Promoter
4. Intron

2.3) RNA polymarases add nucleotides to the growing RNA’s __________

1. 3’
2. 5’
3. Both
4. 3’ to 5’ of the complementary strand

2.3) Describe initiation, elongation and termination of translation.

2.3) What is a polyribosome?

2.3) What are the roles of the P site, A site and E site on the large subunit of the ribosome?

2.3) Discuss the functions of mRNA, rRNA and tRNA during protein synthesis.

2.3) Give short explanations for the following terms: promoter; “upstream” end of a transcription unit; “downstream” end of a transcription unit; Poly A tail.