NCERT Biomolecules questions,solutions,answers,mcqs,pdfs NTA NEET

Biomolecules Mock Exam-7

Question No:1

Assertion: Coenzyme is a non protein group without which enzymes are inactive or incomplete.
Reason: Coenzymes not only provide a point of attachment for the chemical group being transformed but also influence the properties of the group.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:2

Assertion: Activity of an enzyme is pH dependent.
Reason: Change in pH affects the solubility of the enzyme in water.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:3

Assertion: A coenzymes or metal ions that is very tightly bound to enzyme protein is called prosthetic group.
Reason: A complete, catalytically active enzyme together with its bound prosthetic group is called Apoenzyme.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:4

Assertion: Enzymes are proteins which catalyse biochemical reactions.
Reason: The enzymes itself unchanged in the reaction, its presence allows the reaction to take place.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:5

Assertion: Simple carbohydrates having free aldose or ketose group are called reducing sugars.
Reason: They can reduce cupric icon to cuprous state.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:6

Assertion: Protein amino acids possess an amino group attached to a corbon (a amino acid).
Reason: Proline and hydrolyproline have NH (imino group) so they are imino acids.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:7

Assertion: Linolenic acid is precursor of arachidonic acid.
Reason: Ascorbic acid is sugar acid having NH2 group.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:8

Assertion: Protein is a heteropolymer.
Reason: Protein is made up of amino acid.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:9

Assertion: Watson-Crick model of DNA is secondary structure of DNA.
Reason: It contain covalent as well as hydrogen bond.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:10

Assertion: Total number of amino acids involved in protein synthesis in plants is
Reason: Only 20 amino acids have been discovered so far.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:11

Assertion: In human body collagen is the most abundent protein.
Reason: Scleroproteins occure in hard parts of animals body for providing support and protection.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:12

Assertion: Living state is a non-equilibrium steady state to be able to perform work.
Reason: System at equilibrium cannot perform work.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:13

Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?

[A] Enzymes require optimum pH for maximal activity
[B] Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80°-90℃
[C] Enzymes are highly specific
[D] Most enzymes are proteins but some lipids



Question No:14

Select the correct option with respect to mitosis.

[A] Chromatids start moving towards opposite poles in telophase
[B] Golgi complex and endoplasmic reticulum are still visible at the end of prophase
[C] Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase
[D] Chromatids separate but remains in the centre of the cell in anaphase



Question No:15

Which one of the following biomolecules is correctly characterised?

[A] Palmitic acid – an unsaturated fatty acid with 18 carbon atoms
[B] Adenylic acid – adenosine with a glucose phosphate molecule
[C] Alanine amino acid – Contains an amino group and an acidic group anywhere in the molecule
[D] Lecithin – a phosphorylated glyceride found in cell membrane



Question No:16

Which one is the most abundant protein in the animal world?

[A] Trypsin
[B] Haemoglobin
[C] Collagen
[D] Insulin



Question No:17

Transition state structure of the substrate formed during an enzymatic reaction is:

[A] Transient but stable
[B] Permanent but unstable
[C] Transient and unstable
[D] Permanent and stable



Question No:18

A phosphoglyceride always made up of:

[A] Only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
[B] Only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
[C] A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
[D] A saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule



Question No:19

Macro molecule chitin is

[A] Nitrogen containing polysaccharide
[B] Phosphorus containing polysaccharide
[C] Sulphur containing polysaccharide
[D] Simple polysaccharide



Question No:20

The essential chemical components of many coenzymes are:

[A] Proteins
[B] Nucleic acids
[C] Carbohydrates
[D] Vitamins



Question No:21

Select the option which is not correct with respect to enzyme action

[A] Substrate binds with enzyme at its active site
[B] Addition of lot of succinate does not reverse the inhibition of Succinic dehydrogenase by malonate
[C] A non – competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate
[D] Malonate is a competitive inhibitor of Succinic dehydrogenase



Question No:22

Which one of the following is non reducing carbohydrate?

[A] Maltose
[B] Sucrose
[C] Lactose
[D] Ribulose 5 – phosphate



Question No:23

Which one of the following statement is incorrect?

[A] A competitive inhibitor reacts reversibly with the enzyme to form an enzyme inhibitor complex —
[B] In competitive inhibition, the inhibitor molecule is not chemically change by the enzyme
[C] The competitive inhibitor does not affect the rate of breakdown of the enzyme subtract complex
[D] The present of the competitive inhibitor decreases the Km of the enzyme for the substrate.



Question No:24

The chitinous exoskeleton of arthropods is formed by the polymerization of:

[A] D – glucosamine
[B] N – acetyl glucosamine
[C] Lipoglycans
[D] Keratin sulphate and chondroitin sulphate



Question No:25

Which of the following biomolecules does have a phosphodiester bond?

[A] Monosaccharides in a polysaccharide
[B] Amino acids in a polypeptide
[C] Nucleis acids in a nucleotide
[D] Fatty acids in a diglycerides