Question

27. A metal crystallizes into two cubic system-face centred
cubic (fcc) and body centred cubic (bcc) whose unit cell lengths
are 3.5 and 3.0å respectively. Calculate the ratio of densities of
fcc and bcc.
28. Three amino acids are given below:
Alanine CH3CH(COOH)(NH2)
Aspartic
acid H00c-
CH2CH(COOH)(NH2) and Lysine H2N-(CH2)4-CH(COOH)(NH2)
i. Make two tripeptides using these amino acids and mark
the peptide linkage in both cases.
ii. Represent Alanine in the zwitter ionic form.​

Answer 1

Answer:

*Ans of question 27 is

A metal crystallizes into two cubic system-face centred

cubic (fcc) and body centred cubic (bcc) whose unit cell lengths

are 3.5 and 3.0å respectively. Calculate the ratio of densities of

fcc and bcc is 1.259 : 1

*Ans of question 28 is

Three amino acids are given below:

Alanine CH3CH(COOH)(NH2)

Aspartic

acid H00c-

CH2CH(COOH)(NH2) and Lysine H2N-(CH2)4-CH(COOH)(NH2)

i. Make two tripeptides using these amino acids and mark

the peptide linkage in both cases.

ii. Represent Alanine in the zwitter ionic form.e amino acids with nonpolar R groups include glycine (G, Gly, NH2-CH2-COOH), alanine (A, Ala, CH3-CH(NH2)-COOH), valine (V, Val, (CH3)2-CH-CH(NH2)-COOH), leucine (L, Leu, (CH3)2-CH-CH2-CH(NH2)-COOH), methionine (M, Met, CH3-S-(CH2)2-CH(NH2)-COOH ), isoleucine (I, Ile, CH3-CH2-CH(CH3)-CH(NH2)-COOH), phenylalanine (F, Phe, Ph-CH2-CH(NH2)-COOH), tyrosine (Y, Tyr, HO-Ph-CH2-CH(NH2)-COOH), and tryptophan (W, Trp, Ph-NH-CH=C-CH2-CH(NH2)-COOH)