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Biomolecules

Multiple Choice Questions

81.

In a normal adult, ascending order of concentration of following molecules is

K>Na>Fe>Cu
Na>K>Cu>Fe
Fe> Na> K > Cu
Na> Fe> K > Cu

82.

Select the option having all correctly matched pairs.
A. Alkaloids (i) Carotenoid; Anthocyanin
B. Pigments (ii) Vinblastin; curcumin
C. Drugs (iii) Morphine; Codeine

A-i; B-ii;C-iii
A-ii; B-iii; C-i
A-iii; B-i; C-ii
A-i; B-iii; C-ii

83.

Assertion: Excess Mn in soil, can adversely decrease Mg, Fe and Cu concentrations in the soil.

Reason: Mn increases rate of photosynthesis, thereby increasing absorption of Mg, Fe and Ca from soil.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false

84.
Assertion : All proteinecous enzymes have a three-dimensional structure.
Reason : The secondary structure of protein is according to amino acid present inside the polypeptides.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are hue but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

If both assertion and reason are hue but reason is not the correct explanation of assertion.

There are three types of secondary structures- $α$ - helix, $β$ - pleated and collagen helix. They are held together in a particular structure due to hydrogen bonds between oxygen of carboxylic group of amino acid and >NH group of another amino group.

Active site consists of few amino acids brought together by secondary and tertiary structure folding of protein. it is stabilized by several types of bonds- Hydrogen bonds, Ionic bonds, Van der Waal's interaction etc. It gives a three- dimensional conformation to protein.

85.

Assertion : Glutamine contains amide group.

Reason : Isoelectric point of glutamine is 7.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

86.

Vitamin B₆ is also called

thiamine
pantothenic acid
pyridoxine
retinol

87.

What do A, B, C and D represent in the following figure?

A : carrier protein, B: symport, C: uniport, D : antiport
A : carrier protein, B : uniport, C: antiport, D : symport
A: carrier protein, B: antiport, C: symport, D : uniport
A : carrier protein, B: uniport, C: symport, D : antiport

88.

Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness?

Morphine
Valium
Amphetamines
Hashish

89.

Which of the following elements is present in very less quantity in the body

90.

Assertion: Enzymes lower down the activation energy of the reactant molecule to make its transition into product easier.

Reason: Enzymes are highly substrate specific catalysts.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.