Biology MCQs

1496 MCQs — Everyday Science MCQs (Page 30 of 150)

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A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________?

A. Co-enzyme
B. Blocker
C. Inhibitor
D. Cofactor

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Optimal temperature of enzymes present in human body is_____________?

A. 27?c
B. 37?c
C. 47?c
D. 30?c

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Strengthening material of prokaryotic cell wall is__________?

A. Cellulose
B. Chitin
C. Inorganic salts silica waxes and ligin
D. Peptidoglycan or murein.

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Spherical or tubular membranes which separate the material present in endoplasmic reticulum from that of cytoplasmic material are called__________?

A. Cytosol
B. Cisternae
C. Polysomes
D. Cristae

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Whone is not the function of endoplasmic reticulum?

A. Nerve impulse conduction
B. Transport of material
C. Mechanical support
D. Synthesis of conjugated molecules

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60S and 40S subunit combine to form ________ particle.

A. 100 s
B. 90 s
C. 80 s
D. 70 s

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Pancreas produces secretory granules that help in digestion. These granules after passing through endoplasmic reticulum are pinched off from ________ surface of Golgi apparatus:

A. Forming face
B. Maturating face
C. Any of them
D. None of these

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Which of the following statement is incorrect about Glyoxisomes?

A. They contain enzymes which help in conversion of fatty acids into carbohydrate
B. They are abundant in soyabeans but absent in pea.
C. They are present through out life of a plant and provide them whth energy through glyoxylate cycle.
D. They are signle membranous organelles

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Ribosomes + m-RNA?

A. Polysome
B. Phlosome
C. Polosome
D. None of these

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Which of the following impart a red colour to Rose petals?

A. Chloroplast
B. Chlorophyll
C. Chromoplast
D. Leucoplast

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