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# Biomolecules

#### Multiple Choice Questions

181.

Fixation of one CO2 molecule through the Calvin cycle requires.

• 2 ATP and 1 NADPH2

C.

2 ATP is required during conversion of PGA to 1,3 diphosphoglyceric acid and 1 ATP during conversion of glyceraldehyde phosphate to ribulose biphosphate. 2NADPH2 molecules are utilised for converting 1,3 diphosphoglyceric acid to glyceraldehyde phosphate.

182.

Which one from those given below represents the position of nitrogen in the 9-membered double rings of purines?

• 2, 4, 6 and 8

• 1, 3, 7 and 9

• 1, 4, 8 and 9

• 3, 5, 7 and 8

B.

1, 3, 7 and 9

Purines are 9-membered double rings with nitrogen at 1, 3, 7 and 9 positions. DNA has two types of purines namely Adenine (A) and Guanine (G).

183.

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

A.

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

No amino acid is categorised on the basis of carboxyl group.

184.

Out of the given below statements describing the characteristics of various biomolecules, option for the incorrect one

• Fatty acids have hydrocarbon chains that end in a carboxylic group

• Starch consist of amylose and glycogen, which are formed by the condensation of $\mathrm{\alpha }$-D-glucose.

• Cellulose is fibrous polysaccharide of high tensile strength.

• Cutin is a complex lipid produced by cross-esterification and polymerisation of hydroxy fatty acids.

B.

Starch consist of amylose and glycogen, which are formed by the condensation of $\mathrm{\alpha }$-D-glucose.

Starch consist of two components amylose and amylopectin. Amylose is more soluble in water than amylopectin. They both are formed by the condensation of $\mathrm{\alpha }$-D-glucose or pyranose forms.

185.

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

A.

(i) and (ii) only

Paper and cotton fibre are cellulose, whereas chitin is a polymer N- acetyl glucosamine and glycogen is a polysaccharide of glucose.

186.

Match the storage products listed under column I with the organism given under column II, choose the appropriate option from the given options

 Column I Column II A Glycogen 1 Sargassum B Pyrenoids 2 Nostoc C Laminarin and mannitol 3 Polysiphonia D Floridean starch 4 Spirogyra 5 Agaricus

•  A B C D 3 4 1 5
•

 A B C D 4 3 5 2
•  A B C D 5 4 1 3
•  A B C D 2 1 4 3

C.

 A B C D 5 4 1 3

187.

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

D.

A - 4; B - 3; C - 1; D - 2

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

188.

Identify the correct match from the type of amino acids and their respective example.

• Neutral - Proline (Pro)

• Acidic - Asparagine (Asn)

• Aromatic - Tryptophan (Try)

• S-containing - Methionine (met)

A.

Neutral - Proline (Pro)

Proline is a heterocyclic amino acid neutral amino acids include alanine, glycine, etc.

189.

What is the role of NAD+ in cellular respiration?

• It functions as an enzyme.

• It functions as an electron carrier.

• It is the final electron acceptor for anaerobic respiration.

• It is a nucleotide source for ATP synthesis.

B.

It functions as an electron carrier.

In cellular respiration, NAD+ act as an electron carrier.