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NEET Biology Solved Question Paper 2007

Multiple Choice Questions

11.

Which of the following is responsible for the mechanical support, protein synthesis and enzyme transport?

Cell membrane
Mitochondria
Dictyosome
Endoplasmic reticulum

12.

Thickening of arteries due to cholesterol deposition is

arteriosclerosis
rheumatic heart
blood pressure
cardiac arrest

13.

An example of competitive inhibition ofan enzyme is the inhibition of

succinic dehydrogenase by malonic acid
cytochrome oxidase by cyanide
hexokinase by glucose-6-phosphate
carbonic anhydrase by carbon dioxide

14.

Which of the following is the connecting link between glycolysis and Krebs cycle?

Acetyl Co- A
Oxalosuccinic acid
Pyruvic acid
Citric acid

15.

Which of the following contain $β$ -1, 4 linkage?

Maltose
Sucrose
Lactose
Fructose

16.
Which statement is true?

Adenine has 4 nitrogen atoms.

Cytosine has 3 nitrogen atoms

Guanosine has 3 nitrogen atoms

Uracil has 5 nitrogen atoms

Cytosine has 3 nitrogen atoms

Cytosine is one of the four main bases found in DNA and RNA. It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached. It has 3 Nitrogen atoms.

Adenine is a purine nucleobase used in forming nucleotides of the nucleic acids. It binds to thymine via 2 hydrogen bonds to assist in stabilizing the nucleic acid structure.

Guanosine is a purine nucleoside comprising guanine attached to a ribose ring via $β$ - N_g- glycosidic bond. It can be phosphorylated to become guanosine monophosphate (GMP), cyclic guanosine monophosphate (cGMP), guanosine diphosphate (GDP) and guanosine triphosphate (GTP).