Draw a tripeptide only containing Alanine

The primary amino acid sequence of a stretch of polypeptide is Asp-Glu-Pro-Lys-His-Arg. Would you expect this portion of the polypeptide to form an alpha helix at pH=5? Provide 3 reasons to justify your answer.

Which of the following amino acids is most unlikely to be present in a beta sheet? Lysine Valine Leucine Isoleucine 14

Which amino acids would be expected to produce a similar sickling effect if substituted for Val at position 6? alanine leucine lysine arginine phenylalanine

Eukaryotic messenger RNA includes a poly A tail. When the poly(A) tail is less than approximately 30 nucleotides in length, explain why the messenger RNA no longer is protected from nuclease digestion.

All tRNAs from all organisms have the same overall shape. Explain why this is the case.

Why does RNA form A-form helices and not B-form?

A cell has a defective enzyme that attaches the alanine amino acid (Ala), instead of a valine amino acid (Val), to tRNAs with the anticodon CAA.  Will any polypeptides in the cell contain valine?  Why or why not?

Using the table below, which amino acid would you expect a tRNA with the anticodon 5'-AGC-3' to carry? Ala Arg Asp Asn Cys Glu Gin Gly His O Ser O Ala O Arg Thr ទទខ | ៖ ≡ គគគិត