Enzymes MCQs Part 8

title> Enzymes MCQs Part 7

1. The ion which activates salivary amylase activity is

• Chloride
• Bicarbonate
• Sodium
• Potassium

2. The pancreatic amylase activity is increased in the presence of

• Hydrochloric acid
• Bile salts
• Thiocyanate ions
• Calcium ions

3. carbohydrate which can not be digested in human gut is

• Cellulose
• Starch
• Glycogen
• Maltose

4. The sugar absorbed by facilitated diffusion and requiring Na independent transporter is

• Glucose
• Fructose
• Galactose
• Ribose

5. In the intestine the rate of absorption is highest for

• Glucose and galactose
• Fructose and mannose
• Fructose and pentose
• Mannose and pentose

6. Glucose absorption is promoted by

• Vitamin A
• Thiamin
• Vitamin C
• Vitamin K

7. The harmone acting directly on intestinal mucosa and stimulating glucose absorption is

• Insulin
• Glucagon
• Thyroxine
• Vasopressin

8. Given that the standard free energy change (ΔG^o) for the hydrolysis of ATP is –7.3 K cal/mol and that for the hydrolysis of Glucose 6-phosphate is –3.3 Kcal/mol, the ΔG^o for the phosphorylation of glucose is Glucose + ATP → Glucose 6– Phosphate + ADP.

• –10.6 Kcal/mol
• –7.3 Kcal/mol
• –4.0 Kcal/mol
• +4.0 Kcal/mol

9. At low blood glucose concentration, brain but not liver will take up glucose. It is due to the

• Low Km of hexokinase
• Low Km of glucokinase
• Specificity of glucokinase
• Blood brain barrier

10. In the reaction below, Nu TP stands for NuTP + glucose -> Glucose 6–Phosphate + NuDP.

• ATP
• CTP
• GTP
• UTP

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Correct answers:

< Enzymes MCQs Parts = 1.. 2.. 3.. 4.. 5.. 6.. 7.. 8..

Animal Biotechnology MCQs Part 10

1. Which statement is NOT true about a retrovirus?

• It may cause cancer or AIDS
• It contains reverse transcriptase
• It is known to cause diseases only in animals, not in humans
• It has the capacity to integrate cDNA into the host DNA of the cell it infects

2. Blood cells that transport oxygen within the body are the _____________ .

• plasma
• erythrocytes
• platelets
• leukocytes

Animal Biotechnology MCQs Part 9

1. Introduction of foreign genes for improving genotype is ______________

• Tissue culture
• Immunisation
• Biotechnology
• Genetic engineering

2. Where do the female gonads (paired ovaries) lie?

• Pelvic cavity
• Thoracic cavity
• abdominal
• Scrotal sacs

Enzymes MCQs Part 7

1. In acute pancreatitis, the enzyme raised in first five days is

• Serum amylase
• Serum lactic dehydrogenase
• Urinary lipase
• Urinary amylase

2. Acute pancreatitis is characterised by

• Lack of synthesis of zymogen enzymes
• Continuous release of zymogen enzymes into the gut
• Premature activation of zymogen enzymes
• Inactivation of zymogen enzymes

3. An example of functional plasma enzyme is

• Lipoprotein lipase
• Amylase
• Aminotransferase
• Lactate dehydrogenase

4. A non-functional plasma enzyme is

• Psudocholinesterase
• Lipoprotein lipase
• Proenzyme of blood coagulation
• Lipase

5. The pH optima for salivary analyse is

• 6.6–6.8
• 2.0–7.5
• 7.9
• 8.6

6. The pH optima for pancreatic analyse is

• 4.0
• 7.1
• 7.9
• 8.6

7. The pH optima for sucrase is

• 5.0–7.0
• 5.8–6.2
• 5.4–6.0
• 8.6

8. The pH optima for maltase is

• 1.0–2.0
• 5.2–6.0
• 5.8–6.2
• 5.4–6.0

9. The pH optima for lactase is

• 1.0-2.0
• 5.4–6.0
• 5.0–7.0
• 5.8–6.2

10. The substrate for amylase is

• Cane sugar
• Starch
• Lactose
• Ribose

Score =

Correct answers:

Enzymes MCQs Parts => 1.. 2.. 3.. 4.. 5.. 6.. 7.. 8..

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

Biochemistry MCQs part 1

1. A drug which prevents uric acid synthesis by inhibiting the enzyme xanthine oxidase is

• Aspirin
• Allopurinol
• Colchicine
• Probenecid

2. Which of the following is required for crystallization and storage of the hormone insulin?

• Mn⁺⁺
• Mg⁺⁺
• Ca⁺⁺
• Zn⁺⁺

Animal Biotechnology MCQs Part 8

1. Immediately after ovulation, the mammalian egg is covered by a membrane known as _____

• chorion
• zona pellucida
• corona radiata
• vitelline membrane

2. Each centriole in the mature sperm consist of _______________

• 2 central and 9 peripheral fibrils
• 3 central and 6 peripheral fibils
• 4 central and 5 peripheral fibrils
• 9 central and 2 peripheral fibrils

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..

Molecular Genetics MCQs part 1

1. In a nucleotide, the nitrogen base is joined to the sugar molecule by

• Phosphodiester bond
• Glycosidic bond
• Hydrogen bond
• (a) & (b)

2. If a double stranded DNA has 20% Thymine, the percentage of Guanine in the DNA

• 30%
• 10%
• 90%
• 40%

3.If a DNA contains 1000 base pairs, what would be its length?

• 3400 Å
• 34000 Å
• 6800 Å
• 1000 Å

4. What is not True for DNA in prokaryotes

• present in the form of a compact structure called nucleoid
• the coils are maintained by non-histone basic proteins
• found in cytoplasm in a supercoiled condition
• packaged as nucleosomes along with histones

5. Pick the right difference between a DNA and RNA

• Sugar and phosphate
• sugar and purines
• purines and phosphate
• sugar and pyrimidines

6. In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Assertion: In Griffith’s experiment mice were injected by a mixture of heat killed Smooth type bacteria and live Rough type bacteria. Some mice died of pneumonia and their blood contained both live Rough type bacteria and live Smooth type bacteria.
Reason: The dead Smooth type bacteria became alive and caused pneumonia. Griffith named it as transforming principle.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion, then mark (a)
• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (b)
• If Assertion is true but Reason are false, then mark (c)
• If both Assertion and Reason are false, then mark (d)

7. Hershey and Chase experiment proving DNA as the genetic material was based on the principle

• Transduction
• transformation
• transcription
• translation

8. A bacterial colony containing DNA made up of 100% N15 nitrogen bases is allowed to replicate in a medium containing N14 bases. After one round of replication the result would be

• All individuals will be identical to parents
• All individuals will be hybrids
• Only 50% individuals would be hybrids
• All individuals would have DNA made up of 100% N¹⁴

9. Teminism is

• a central dogma reverse
• a central dogma of molecular biology
• a circular flow of hereditary material
• an effect of cytoplasm on functioning of DNA

10. Cistron is

• The coding sequence of DNA
• The functional unit of DNA molecule that codes for a particular gene product
• Intervening non coding sequence of DNA
• The sequences which are removed during RNA splicing

Score =

Correct answers:

Molecular Genetics MCQs Parts => 1..

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..

Photosynthesis MCQs part 5

1. In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP?

• energy released as electrons flow through the electron transport system
• energy released from substrate-level phosphorylation
• energy released from ATP synthase pumping hydrogen ions against their concentration gradient
• energy released from movement of protons through ATP synthase

2. Energy released by the electron transport chain is used to pump H+ ions into which location?

• cytosol
• mitochondrial outer membrane
• mitochondrial inner membrane
• mitochondrial intermembrane space

3. During aerobic cellular respiration, a proton gradient in mitochondria is generated by ____ and used primarily for ____.

• the electron transport chain, ATP synthesis
• the electron transport chain, substrate-level phosphorylation
• glycolysis, production of H₂O
• fermentation, NAD⁺ reduction

4. The direct energy source that drives ATP synthesis during respiratory oxidative phosphorylation is

• oxidation of glucose to CO₂ and water
• the thermodynamically favorable flow of electrons from NADH to the mitochondrial electron transport carriers
• the final transfer of electrons to oxygen
• the difference in H⁺ concentrations on opposite sides of the inner mitochondrial membrane

5. Where is ATP synthase located in the mitochondrion?

• cytosol
• outer membrane
• electron transport chain
• inner membrane

6. In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

• ATP, CO₂ and ethanol (ethyl alcohol)
• ATP, CO₂, and lactate
• ATP, NADH, and pyruvate
• ATP, pyruvate, and oxygen

7. You have a friend who lost 7 kg (about 15 pounds) of fat on a "low carb" diet. How did the fat leave her body?

• It was released as CO₂ and H₂O
• Chemical energy was converted to heat and then released
• It was converted to ATP, which weighs much less than fat
• It was broken down to amino acids and eliminated from the body

8. Organisms that can exist with light as an energy source and an inorganic form of carbon and other raw materials

• are called photoautotrophs
• do not exist in nature
• are called heterotrophs
• are best classified as decomposers

9. Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

• CO₂ and glucose
• H₂O and O₂
• ADP, Pi, and NADP⁺
• ATP and NADPH

10. What is the primary function of the light reactions of photosynthesis?

• to produce energy-rich glucose from carbon dioxide and water
• to produce ATP and NADPH
• to produce NADPH used in respiration
• to convert light energy to the chemical energy of PGAL

Score =

Correct answers:

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Photosynthesis MCQs Parts => 1.. 2.. 3.. 4.. 5.. 6..

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

Cell Cycle MCQs Part 3

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Cell Cycle MCQs Parts => 1.. 2.. 3.. 4..