NEET Botany Biology Biomolecules MCQs

A novel enzyme is discovered that catalyzes the hydrolysis of a specific peptide bond. Kinetic studies reveal a $K_m$ of 10 μM and a $V_{max}$ of 50 μmol/min. A competitive inhibitor with a $K_i$ of 2 μM is added at a concentration of 5 μM. What will be the apparent $K_m$ and $V_{max}$ in the presence of the inhibitor?

Which of the following statements are correct?

I. Acetic acid can form cholesterol

II. Flow of metabolites through metabolic pathway has a definite rate and direction. It is called dynamic state of body constituents

III. Anabolic pathway is endergonic while catabolic pathway is exergonic

IV. All biomolecules have a term over, i.e., they are constantly being changed into some other biomolecules and also made from other biomolecules

The correct options is

Which of the following statements are correct?

I. Relative abundance of carbon and hydrogen with respect to other elements is higher in any living organisms

II. Living organisms have more nitrogen and oxygen per unit mass than inanimate objects (e.g., earth crust)

III. All the elements present in a sample of earth’s crust are also present in a sample of living tissue

IV. Living organisms have more Ca,Mg,Na in them than inanimate object

Which of the following statements are incorrect?

I. Left end of a polysaccharide is called non-reducing end while right end is called reducing end

II. Starch and glycogen are branched molecules

III. Starch and glycogen are the reserve food materials of plants and animals, respectively

IV. Starch can hold iodine molecules in its helical secondary structure but cellulose being non-helical, cannot hold iodine

Read the following statements about enzyme cofactors and choose the option that correctly states then true (T) or false (F).

A) Co-enzyme nicotinamide adenine dinucleotide contain the vitamin B3.

B) Haem is the transient bound co-enzyme for enzyme catalase.

C) Co-factors are non-protein constituents that bound to some enzymes, to make them catalytically active

D) Zinc is a co-enzyme for enzyme carboxypeptidase