Protein Questions Online Test 12

1. In urea synthesis, the amino acid functioning solely as an enzyme activator:

• N-acetyl glutamate
• Ornithine
• Citrulline
• Arginine

2. The enzyme carbamoyl phosphate synthetase requires

• Mg⁺⁺
• Ca⁺⁺
• Na⁺
• K⁺

DNA and RNA Structure Questions Online Test 4

1. Peptide linkages are formed in between

• Nucleotides
• Amino acids
• Glucose molecules
• Sucrose

2. The nucleic acid of polio viruses is

• DNA
• RNA – (+) type
• t-RNA
• m-RNA

Animal Biotechnology Questions Online Test 11

1. Bioethcs is related to ________________

• Preventing biopiracy
• Regulation of unethical activities likegene cloning in animals
• Preventing theft of living materials
• Moral guidance to the problems in biology

2. Pasteur chose the Latin root word for "virus" meaning ____________ Answer: C

• extremely small
• non-living
• poison
• particle

DNA and RNA Structure MCQs part 3

1. A gene that takes part in the synthesis of polypeptide is

• Structural gene
• Regulator gene
• Operator gene
• Promoter gene

2. DNA replicates during

• G1 – phase
• S – phase
• G2 – phase
• M – phase

Protein MCQs Part 11

1. The end product of protein digestion in G.I.T. is

• Dipeptide
• Tripeptide
• Polypeptide
• Amino acid

2. Natural L-isomers of amino acids are absorbed from intestine by

• Passive diffusion
• Simple diffusion
• Faciliated diffusion
• Active process

3. Abnormalities of blood clotting are

• Haemophilia
• Christmas disease
• Gout
• Both (A) and (B)

4. An important reaction for the synthesis of amino acid from carbohydrate intermediates is transamination which requires the cofactor:

• Thiamin
• Riboflavin
• Niacin
• Pyridoxal phosphate

5. The main sites for oxidative deamination are

• Liver and kidney
• Skin and pancreas
• Intestine and mammary gland
• Lung and spleen

6. A positive nitrogen balance occurs

• In growing infant
• Following surgery
• In advanced cancer
• In kwashiorkar

7. The main site of urea synthesis in mammals is

• Liver
• Skin
• Intestine
• Kidney

8. The enzymes of urea synthesis are found in

• Mitochondria only
• Cytosol only
• Both mitochondria and cytosol
• Nucleus

9. The number of ATP required for urea synthesis is

• 0
• 1
• 2
• 3

10. Most of the ammonia released from L-Alpha- amino acids reflects the coupled action of transaminase and

• L-glutamate dehydrogenase
• L-amino acid oxidase
• Histidase
• Serine dehydratase

Score =

Correct answers:

Protein MCQs Parts => 1.. .. 10.. 11..

Protein MCQs Part 10

1. Pepsinogen is converted to active pepsin by

• HCl
• Bile salts
• Ca++
• Enterokinase

2. The optimal pH for the enzyme rennin is

• 2.0
• 4.0
• 8.0
• 6.0

3. The optimal pH for the enzyme trypsin is

• 1.0–2.0
• 2.0–4.0
• 5.2–6.2
• 5.8–6.2

4. The optimal pH for the enzyme chymotrypsin is

• 2.0
• 4.0
• 6.0
• 8.0

5. Trypsinogen is converted to active trypsin by

• Enterokinase
• Bile salts
• HCl
• Mg⁺⁺

6. Pepsin acts on denatured proteins to produce

• Proteoses and peptones
• Polypeptides
• Peptides
• Dipeptides

7. Renin converts casein to paracasein in presence of

• Ca++
• Mg⁺⁺
• Na⁺
• K⁺

8. An expopeptidase is

• Trypsin
• Chymotrypsin
• Elastase
• Elastase

9. The enzyme trypsin is specific for peptide bonds of

• Basic amino acids
• Acidic amino acids
• Aromatic amino acids
• Next to small amino acid residues

10. Chymotrypsin is specific for peptide bonds containing

• Uncharged amino acid residues
• Acidic amino acids
• Basic amino acid
• Small amino acid residues

Score =

Correct answers:

Protein MCQs Parts => 1.. 2.. 3.. 4.. 5.. 6.. 7.. 8.. 9.. 10.. 11..