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..

DNA and RNA Structure MCQs part 1

1. A peculiar cytochrome is observed in bacteria and it can react with molecular oxygen, what is it?

• Cyt b
• Cyt c
• Cyt d
• Cyt o

2. The genetic material in HIV is

• ds DNA
• ss DNA
• s RNA
• None of these

Biochemistry MCQs part 2

1. Which of the following statement is correct about membrane cholesterol?

• The hydroxyl group is located near the centre of the lipid layer
• Most of the cholesterol is in the form of a cholesterol ester
• The steroid nucleus form forms a rigid, planar structure
• The hydrocarbon chain of cholesterol projects into the extracellular fluid

2. Which one is the heaviest particulate component of the cell?

• Nucleus
• Mitochondria
• Cytoplasm
• Golgi apparatus

Protein MCQs Part 9

1. For synthesis of prostaglandins, the essential fatty acids give rise to a fatty acid containing

• 12 carbon atoms
• 16 carbon atoms
• 20 carbon atoms
• 24 carbon atoms

2. All active prostaglandins have at least one double bond between positions

• 7 and 8
• 10 and 11
• 13 and 14
• 16 and 17

3. Normal range of plasma total phospholipids is

• 0.2–0.6 mmol per L
• 0.9–2.0 mmol per L
• 1.8–5.8 mmol per L
• 2.8–5.3 mmol per L

4. HDL2 have the density in the range of

• 1.006–1.019
• 1.019–1.032
• 1.032–1.063
• 1.063–1.125

5.β-lipoproteins have the density in the range of

• 0.95–1.006
• 1.006–1.019
• 1.019–1.063
• 1.063–1.125

6. IDL have the density in the range of

• 0.95–1.006
• 1.006–1.019
• 1.019–1.032
• 1.032–1.163

7. Aspirin inhibits the activity of the enzyme:

• Lipoxygenase
• Cyclooxygenase
• Phospholipae A1
• Phospholipase A2

8. A ’suicide enzyme’ is

• Cycloxygenase
• Lipooxygenase
• Phospholipase A1
• Phospholipase A2

9. In adipose tissue prostaglandins decrease

• Lipogenesis
• Lipolysis
• Gluconeogenesis
• Glycogenolysis

10. The optimal pH for the enzyme pepsin is

• 1.0–2.0
• 4.0–5.0
• 5.2–6.0
• 5.8–6.2

Score =

Correct answers:

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

Plant Hormones MCQs Part 4

1. The Greek root words meaning "plant" and "color" are the basis for the term

• auxin
• tropism
• nastic
• phytochrome

2. How do some plants seeds "know" when it is day and night, and perhaps when to germinate?

• They chemically count the circadian cycles
• All plant hormones are products of photosynthetic systems
• Photosynthetic rates provide direct evidence of sun-produced food
• Phytochromes cycle between red and far-red absorption and light levels can inhibit germination

3. Gravitropism in roots

• is positive when plant roots grow downward
• is due to statoliths in the root cap cells
• is due to amyloplasts
• All of the choices are true

4. Apical dominance in plants is due to which of the following plant hormones?

• ethylene
• gibberellin
• auxins
• cytokinins

5. Which of the following is/are true regarding gibberellins?

• there are about 70 chemically different gibberellins
• are growth promoters causing stem elongation
• these hormones can break seed and bud dormancy
• all of the choices are true

6. Cytokinins

• are plant hormones that promote cell division
• are used in combination with auxin to produce plants from undifferentiated callose tissue
• also work with oligosaccharins to effect tissue differentiation
• All of these are true regarding cytokinins

7. which of the plant hormones ripens fruit and control abscission

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

8. Hormone which induces amylase production in seeds

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

9. Hormone which affects stomatal response to water stress

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

10. Hormone which promotes cell division

• Gibberellin
• Abscisic acid
• Ethylene
• Cytokinin

Score =

Correct answers:

Plant Hormones MCQs Parts => 1.. 2.. 3.. 4..

Enzymes MCQs Part 6

1. The normal serum alkaline phosphatase activity ranges from

• 1.0–5.0 KA units/100 ml
• 5.0–13.0 KA units/100 ml
• 0.8–2.3 KA units/100 ml
• 13.0–21.0 KA units/100 ml

2. In early stages of myocardial ischemia the most sensitive indicator is the measurement of the activity of

• CPK
• SGPT
• SGOT
• LDH

3. Serum acid phosphatase level increases in

• Metastatic carcinoma of prostate
• Myocardial infarction
• Wilson’s disease
• Liver diseases

4. Serum alkaline phosphatase level increases in

• Hypothyroidism
• Carcinoma of prostate
• Hyperparathyroidism
• Myocardial ischemia

5. Serum lipase level increases in

• Paget’s disease
• Gaucher’s disease
• Acute pancreatitis
• Diabetes mellitus

6. Serum ferroxidase level decreases in

• Gaucher’s disease
• Cirrhosis of liver
• Acute pancreatitis
• Wilson’s disease

7. The isoenzymes LDH5 is elevated in

• Myocardial infarction
• Peptic ulcer
• Liver disease
• Infectious diseases

8. On the third day of onset of acute myocardial infarction the enzyme elevated is

• Serum AST
• Serum CK
• Serum LDH
• Serum ALT

9. LDH1 and LDH2 are elevated in

• Myocardial infarction
• Liver disease
• Kidney disease
• Brain disease

10. The CK isoenzymes present in cardiac muscle is

• BB and MB
• MM and MB
• BB only
• MB only

Score =

Correct answers:

Enzymes MCQs Parts => 1.. 2.. 3.. 4.. 5.. 6.. 7..

Enzymes MCQs Part 5

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Protein MCQs Part 8

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Enzymes MCQs Part 4

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Photosynthesis MCQs part 4

Photosynthesis

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