biology MCQs – Page 23

Practise multiple-choice questions from biology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

biology Mcqs

441. The unicellular organisms ingest large molecules into their cytoplasm from the external environment without previously digesting them. This process is called___________?
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A. Phagocytosis

B. Plasmolysis

C. Diffusion

D. Osmosis

442. In an aqueous environment the most stable tertiary conformation is that in which _________ amino acids are buried inside the conformation?
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A. Hydrophilic

B. Basic

C. Hydrophobic

D. None of these

443. The one which causes contraction of wall of the uterus during and after birth?
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A. MSH

B. ADH

C. Progesterone

D. Oxytocin

444. Lipids are soluble in which of the following_______________?
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A. All solvents

B. Water

C. Ether

D. Not in any of the above

445. Exposure to low temperature stimulates plants to flower. This is called___________?
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A. Vernalisation

B. Thermotropism

C. Photoperiodism

D. Thermoregulation

446. If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________?
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A. increase in pH

B. increase in concentration of substrate

C. increase in temperature

D. increase in concentration of enzyme

447. The bond formed when two or more atoms complete their electron shells by sharing electrons is called_____________?
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A. Hydrogen bond

B. Covalent bond

C. Ionic bond

D. Electrovalent bond

448. All of the following are involved in nitrification except
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A. Nitrobacter

B. Nitrosomonas

C. All of these

D. Rhizohium

449. Autophagosomes are____________?
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A. Those lysosomes which eat parts of their own cells to generate energy.

B. Those lysosomes which eat old and worn out cellular organelles.

C. Lysosomes which help in extracellular digestion

D. Both a and b

450. A group of ribosomes attached to mRNA is known as___________?
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A. Monomer

B. Polymer

C. Polysomes

D. Polypeptide

451. In human female, fertilization commonly occurs at______________?
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A. Distal part of oviduct

B. Proximal part of oviduct

C. Uterus

D. Cervix

452. Proteins are polymers of___________?
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A. Fatty acids

B. Amino acids

C. Isoprenoid units

D. Nucleotides

453. Glycolipids and glycoproteins have structural role in the ______________ matrix of animal and bacterial cell?
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A. Extracellular

B. Intracellular

C. Both of these

D. Glucose

454. The covalent bond between two monosaccharide subunits is called________________?
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A. Phosphodiester bond

B. Peptide bond

C. Ionic bond

D. Glycosidic Bond

455. Who first observed and thus hypothesized that new cells are formed from previously existing living cell?
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A. Theodor Schwann and Schleiden

B. Rudolph Virchows

C. Louis Pasteur

D. Both b and c

456. How many moles of carbon dioxide are produced by complete oxidation of one mole of puruvic acid?
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A. 2

B. 1

C. 6

D. 3

457. Shell of egg is leathery in appearance in___________?
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A. Prototherians

B. Birds

C. Reptiles

D. Amphibians

458. An enzyme which can convert single stranded RNA into double stranded viral DNA is called____________?
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A. DNA polymerase

B. DNAase

C. RNAase

D. Reverse Transcriptase

459. Protein subunits of capsid is called the capsomeres is a characteristic of each virus. Their number in Herpes virus is__________?
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A. 152

B. 162

C. 172

D. 100

460. in which cell ribosome are of large size and present either on endoplasmic reticulum or free in cytoplasm?
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A. both

B. all the above

C. eukaryotic

D. prokaryotic

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