Amino Acids

Q.

How are amino-acids classified?

Q. Which of the following is an organic compound?

1. Prosthetic group
2. Coenzymes
3. Metal ions
4. Both a and b

Q.

Are nucleotides acidic or basic?

Q.

Write about the membrane proteins and their functions.

Q. Matrix is made up of what

Q.

What does a transamination mainly involve?

Q. Amino acids are said to be amphoteric in nature because:

1. They have both primary and secondary structure
2. They act as both acids as well as bases
3. They are both aliphatic and aromatic
4. They can be essential or non-essential

Q. Collagen fibres are

1. yellow in colour
2. branched
3. made up of elastin protein
4. white in colour

Q.

Why Should Amino Acids Be Deaminated?

Q.

Which of the following is not an aromatic amino acid?

1. Tryptophan

2. Tyrosine

3. Phenylalanine

4. Glycine

Q.

How many types of proteins are in the human body?

Q. Match the Column I and II.

Column I	Column II
A. Elaioplast	I. Storage of starch
B. Aleuroplast	II. Storage of fat
C. Amyloplast	III. Storage of protein
D. Chromoplast	IV. Coloured pigments

1. A-I, B-IV, C-II, D-III
2. A-IV, B-I, C-III, D-II
3. A-II, B-III, C-I, D-IV
4. A-IV, B-III, C-II, D-I

Q. In the monocotyledonous seeds, the endosperm is separated from the embryo by a distinct layer known as

1. testa
2. aleurone layer
3. coleoptile
4. scutellum

Q. According to the graph given below, zwitterions for an amino acid X are most likely to be obtained in a solution of pH

1. 1
2. 2
3. 6
4. 10

Q.

Amino acids have substituent groups occupying the four valency positions of the central carbon atom. The substituents are

1. hydrogen, carboxyl group, amino group
2. two hydrogen, carboxyl group and amino group
3. two carboxyl groups, two amino groups
4. hydrogen, carboxyl group, amino group and a variable R group

Q. Formation of glucose from protein is:

1. Gluconeogenesis
2. Glycogenolysis
3. Glycolysis
4. Glycogenesis

Q. Plastids storing fats and oil are

1. chromoplast
2. Elaioplast
3. Aleuroplast
4. Amyloplast

Q.

What is the importance of endosperm ?Give 10 points?

Q. Which of the following enzyme(s) has/have heme as a prosthetic group?
(i) Catalase
(ii) Carboxypeptidase
(iii) Succinic dehydrogenase
(iv) Peroxidase

1. (i) only
2. (i) and (ii)
3. (ii) and (iii)
4. (i) and (iv)

Q.

Pyrenoids are made up of

A. Core of starch surrounded by protein sheath

B. Proteinaceous center and starchy sheath

C. Core of protein surrounded by nucleic acid sheath

D. Core of protein surroundes by fatty sheath

Q. The charged molecule which is electrically neutral is known as:

1. Peptide
2. Amino acid
3. Zwitterion
4. Amide

Q. How many electron and protons are required to fix a dinitrogen?

1. 32 each
2. 16 each
3. 8 each
4. 4 each

Q. An example of protein with secondary structure is

1. Myoglobin
2. Haemoglobin
3. All of the above
4. Keratin

Q.

What do glycoproteins, lipoproteins, nucleoproteins and chromoproteins have?

Q.

Attempt titrating an amino acid against a weak base and discover the number of dissociating (ionizable) functional groups in the amino acid.

Q. Lysine is an essential amino acid as it is

1. Very rare
2. Important constituent of all proteins
3. With high nutritive value
4. Not formed in the body and has to be provided in diet.

Q. A zwitterion is kept in a uniform electric field. Select the correct statement with regard to the movement of the zwitterion.

1. It moves towards the anode
2. It moves along the direction of the electric field
3. It moves towards the cathode
4. It neither moves towards anode nor towards the cathode

Q. Match the following column.

$\begin{array}{cccc}& \text{Column-I}& & \text{Column-II}\\ & \text{(Triplet codons)}& & \text{(Amino acids)}\\ \text{A}& \text{UUU}& \text{(1)}& \text{Alanine}\\ \text{B}& \text{CCC}& \text{(2)}& \text{Glycine}\\ \text{C}& \text{AAA}& \text{(3)}& \text{Lysine}\\ \text{D}& \text{GGG}& \text{(4)}& \text{Proline}\\ & & \text{(5)}& \text{Phenylalanine}\end{array}$

1. (A)–4, (B)–5, (C)–2, (D)–3
2. (A)–5, (B)–4, (C)–3, (D)–2
3. (A)–1, (B)–2, (C)–4, (D)–5
4. (A)-2, (B)-3, (C)-4, (D)–5

Q. What is codon?

Q. Argentaffin cells are found in:

1. Pancreas
2. Intestine
3. Gastric glands
4. Liver