Biology : Biomolecules

The given organic compound is a diagrammatic representation of

• Lecithin

• Adenosine

• Adenylic acid

• Uridine

• Uridine

Which of the following statements about the structure of proteins is true?

• The sequence of amino acids in a protein represents the secondary structure

• The helices of proteins are always left handed

• Adult human hemoglobin consists of two subunits

• The left end of a protein is called the C-terminal and the right end is called the N-terminal

• The left end of a protein is called the C-terminal and the right end is called the N-terminal

Which of the following secondary metabolites belong to the group drugs?

I. Morphine

II. Curcumin

III. Codeine

IV . Vinblastine

V. Abrin

• I and II only

• I and V only

• II and III only

• II and IV only

• II and IV only

Some amino acids are coded by more than one codon as the code is

• unambiguous

• specific

• universal

• punctuated

• punctuated

In a polypeptide, amino acids are linked by

• An ester bond

• A hydrogen bond

• A covalent bond

• A glycosidic bond

• A glycosidic bond

Which of the following is/are cellulosic?

(i) Paper

(ii) Cotton fibre

(iii) Chitin

(iv) Glycogen

• (i) and (ii) only

• (i) and (iii) only

• (i), (iii) and (iv) only

• (iii) and (iv) only

• (iii) and (iv) only

Which of the following statements about amino acids is false?

• Based on the nature of the carboxyl group there are many amino acids

• Amino acids are substituted methane

• Amino acids have an amino group and acidic group as substituent on the $\mathrm{\alpha }$-carbon

• There are four substituent groups occupying the four valency positions

• There are four substituent groups occupying the four valency positions

Match Column I with Column II and choose the right option

Column I	Column II
A. Acetyl CoA	1. 3-carbon compound
B. Malic acid	2. 6-carbon compound
C. Pyruvic acid	3. 4-carbon compound
D. Glucose	4. 2-carbon compound

• A - 2; B - 4; C - 3; D - 1

• A - 2; B - 3; C - 4; D - 1

• A - 4; B - 1; C - 2; D - 3

• A - 4; B - 3; C - 1; D - 2

• A - 4; B - 3; C - 1; D - 2

Concanavalin A is

• an essential oil

• a lectin

• a pigment

• an alkaloid

Consider the following statement :

(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.

(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.

Select the correct option.

• (A) is true but (B) is false.

• Both (A) and (B) are false

• (A) is false but (B) is true

• Both (A) and (B) are true.