Biology Class 9th

341. Which of the following occurs in meiosis I but not in Mitosis?

A) The Chromatids of each chromosome are separated

B) Synapsis and Crossing Over

C) The Nuclear Envelope breaks down.

342. Two sister chromatids are collectively called:

A) Chromosome

B) Centromere

C) Multichromatid

D) Homologous Pair

343. The Chemical processes that occur within a living organism in order to maintain life are collectively called:

A) Respiration

B) Transpiration

C) Metabolism

D) Reduction

344. All Metabolic reactions are controlled by agents called:

A) Enzymes

B) Glycoproteins

C) Lipids

D) None of the above.

345. The process of synthesis of larger molecules from smaller molecules is called :

A) Anabolism

B) Catabolism

C) Addition reaction.

D) none of the above.

346. Photosynthesis is an example of:

A) Anabolism

B) Catabolism

C) Energy Production.

D) Reduction

347. Catabolism is:

A) The synthesis of larger molecules from lower molecules.

B) The breakdown of the larger molecules from larger molecules.

C) Production of Glucose from water.

D) None of the above.

348. The breakdown of glucose produces:

A) CO2

B) Water

C) Oxygen

D) A and B

349. Enzymes are biological agents that:

A) Prevent chemicals reactions

B) Slows down chemical reactions

C) Speedup Chemical reactions.

D) None of the above.

350. Substrates are:

A) Molecules that react in Enzyme catalyzed reactions

B) Molecules that are produced in Enzyme catalyzed reactions.

C) Molecules that help in Enzymes catalyzed reactions.

D) Molecules that are not effected in Enzymes catalyzed reactions.

351. The word “ Enzyme” was first used by:

A) Jean Baptist

B) Wimhelm Kuhne

C) Robert Brown

D) Alex Fleming.

352. Activation energy can be defined as:

A) Amount of energy to produce chemical bonds

B) Amont of energy produced after chemical reaction

C) Amount of enerfy required to break down chemical bonds

D) None of the Above.

353. Enzymes _________ the activation energy.

A) Increase

B) Decrease

C) has no effect

354. Enzymes can change of the substrate molecules and bring them in correct orientation. This shall cause:

A) Production of energy

B)  Decrease in activation energy required.

C) Speed up the reaction

D) none of the above.

355. Enzymes are _______ in nature.

A) Lipid

B) Proteins

C) Carbohydrate

D) None of the above.

356. Enzymes function as _________.

A) Activators

B) Catalyst

C) Reducers

D) Stoppers.

357. Enzymes are _______ in action

A) General

B) Specific

C) None of the above.

358. A _______ amount of enzyme is needed to catalyze relatively large quantities of substrate.

A) Small

B) Large

C) No Amount.

359. The reaction in which water molecule is broken down is called:

A) Hydrolases

B) Dehydration

C) Reduction

D) Hydrolysis.

360. Enzymes that work inside of cell:

A) Intercellular Enzymes

B) Intracellular Enzymes

C) Extracellular enzymes.

D) None of the above.