Enzymes(Senior Class Biology Study by Topics Test) : Gate Academy

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NAME

PHONE NUMBER

Study the diagram below.

Which of the following is the substrate?

Water

Catalase

Hydrogen peroxide

Oxygen

None

___________ reactions are chemical reactions that build or synthesize products by combining the substrates.
(leave answer in lowercase)

Inhibitors are

Chemical that interfere with enzyme activity

Use the active site

Look like the substrate

Fight for position

None

Which of the following enzyme is responsible for the regulation of biological nitrogen fixation?

Dinitrogenase reductase

Kinase

Dinitrogenase oxidase

Phosphatase

None

Enzymes are reaction specific ( each reaction has a specific enzyme that catalyzes it)

True

False

None

Enzymes end in - ase

True

False

None

Which of the following is the CORRECT function of enzyme, Peptidase?

Remove phosphate from a substrate

Removal of H2O

Cleave phosphodiester bond

Cleave amino bonds

None

Which of the following enzyme catalyzes a reaction that introduces reduced nitrogen to cellular metabolism?

Bacterial glutamine synthase

Phosphatase

Bacterial dinitrogenase reductase

Bacterial dinitrogenase oxidase

None

Forming and breaking bonds requires ________ depending upon what kind of a reaction you have.

fusion

protein

energy

fuel

None

10.

Which of this vitamin is associated with the coenzyme Biocytin?

Pyridoxine

Biotin

Thiamine

Nicotinic acid

None

11.

Which is the enzyme that acts as a regulatory enzyme in a four-step metabolic pathway?

First enzyme

Second enzyme

Third enzyme

Fourth enzyme

None

12.

Which of the following reaction is catalyzed by Lyase?

Intramolecular rearrangement of bonds

Breaking of bonds

Transfer of group from one molecule to another

Formation of bonds

None

13.

Which of the following is NOT true about enzymes?

Enzymes lower the activation energy

Enzymes are proteins

Enzymes catalyzes chemical reactions

Enzymes react with the substrate in a chemical reaction.

None

14.

___________ inhibitors change the shape of an enzyme.

Nondistributive

Competititve

Distributive

Noncompetitive

None

15.

What is the function of phosphorylase?

Transfer amino group

Transfer inorganic phosphate

Transfer a carboxylate group

Use H2O2 as the electron acceptor

None

16.

Which one is not correct about ATP?Which one is not correct about ATP?

Powers nearly all of cellular work

Potential of molecules

ATP is the energy molecule of cells

Made by adding a phosphate to ADP

None

17.

Which of the following is false about feedback regulation?

The best example is the biosynthesis of L-isoleucine from L-threonine in bacteria

The synthesis of concerned enzyme is inhibited by interfering with the gene of that enzyme

It is a type of enzymatic activity regulation

Concentration of enzyme is reduced by the end product

None

18.

Active site is?

Where the reactant fits into the enzyme

Balance of living organism can affect the enzyme

Where the enzyme and molecule bond together

Where there is a shape change that occurs when bonding

None

19.

Co factors are

Organic co factors

Non protein substances that help to facilitate enzymes

Interfere with protein bonds

Trigger enzyme to quit producing insulin

None

20.

Which one is not an enzyme used for MI diagnosis?

ALT

Troponin T

LDH

AST

None

21.

Energy is _______________ by the products in endergonic chemical reactions.

reversed

transferred

distributed

absorbed

None

22.

How many types of enzymatic regulation mechanism occurs in the cells?

None

23.

Which of the following function is catalyzed by Racemases?

Inversion of asymmetric carbon atom

Removal of water

Interconversion of L and D stereoisomers

Intramolecular transfer of a functional group

None

24.

_____ is required to start a reaction. (leave answer in lowercase)

25.

Excess final products in a series of chemical reaction causes _________ inhibition.
(leave answer in lowercase)

1 out of 25

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