Q. Which of the following phytohormone is responsible for regulating the opening and closing of stomata ?
A) GA
B) ABA
C) IBA
D) kinetin
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Answer is B). ABA
Abscisic acid (also called ABA), was discovered and researched under two different names before its chemical properties were fully known, it was called dormin and abscicin II. Once it was...
Friday, 19 March 2021
Q. The amount of water to be added to 10 ml of 10 N HCL solution to make it decinormal solution is
A) 1000 ml
B) 990 ml
C) 100 ml
D) 10 ml
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Answer is B). 990 ml
N1V1 = N2V2
So 10x10 = 0.1 x V. or V = 1000 ml
So extra water addes will be 990 ml
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Thursday, 18 March 2021
Q. At which stage of mitosis do you find chromosomes being first visible under the microscope ?
A) Metaphase
B) Telophase
C) Prophase
D) Anaphase
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Answer is C). Prophase
Prophase is a stage of mitosis in which the chromatin condenses (it becomes shorter and fatter) into a highly ordered structure called a chromosome, which becomes visible...
Q. Which one of the following is not a water soluble vitamin ?
A) Cyanocobalamine
B) Ascorbic acid
C) Retinol
D) Niacin
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Answer is C). Retinol
Retinol is one of the most usable forms of Vitamin A. a fat-soluble vitamin and diterpenoid. Retinoids include the compounds retinoic acid, retinal (aldehyde) and retinyl ester. These compounds are available...
Thursday, 11 March 2021
Q. Histamine is released by which of these cells ?
A) Macrophages
B) Lymphocytes
C) Mast cells
D) Basophils
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Answer is C). Mast cells
A mast cell is a resident cell of several types of tissues and contains many granules rich in histamine and heparin. Although best known for their role in allergy and anaphylaxis, mast cells play an important...
Q. An allosteric inhibitor of an enzyme usually
A) binds to the active site
B) participates in feedback regulation
C) denatures the enzyme
D) cause the enzyme to work faster
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Answer is B). participates in feedback regulation
Allosteric enzymes are those that have more than one activation center and to which other substances, called allosteric...
Q. Which of the following group represents pro-inflammatory cytokines ?
A)IL-2, IL-4, IL-5, IL-15
B) IL-10, TGF-β, IL-13
C) IL-1, IL-6, IL-12
D) IL-8, IP-10, IL-17
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Answer is C). IL-1, IL-6, IL-12
Proinflammatory cytosines can be generally defined as small chemicals that are created by or help produce inflammation. These include IL-1, IL-6...