BIOSPLENDID 2.2 (SET 1 ) SEM 2

1. A group of species is separated into two populations by a mountain range.  Mating between individuals of the two populations produces sterile progenies. Which of the following explains this phenomenon?

• Speciation does not take place.  

• Genetic drift does not take place.  

• Allopatric speciation takes place.  

• Sympatric speciation takes place

2. What is the mechanism that can cause sympatric speciation?

• Reproductive isolation

• Polyploidy

• Extrinsic isolation

• Geographical isolation

3. Natural selection involves environmental factors as selecting agent.  Which of the following is NOT a type of natural selection?

• Stabilising selection

• Disruptive selection

• Directional selection

• Outbreeding

4.Substrate binds to enzyme at the

• Active site

• Allosteric site

• Regulatory site

• Substrate-enzyme complex

5. Which of the following statements is NOT the property of an enzyme?

• It is reusable.

• Posses active site.

• Enzyme is a fibrous protein.

• Only a small amount is needed to bring about of large amount of substrates.

6. When the pH value is above or below optimum pH, the enzymatic activity will ___________.

• increase.

• decrease.

• immediately stop.

• remain unchanged.

7.The oxidation of a pyruvate to acetyl coenzyme A

• occurs in cytosol

• releases one molecule of carbon dioxide

• requires two molecules of ATP

• releases one molecule of FADH₂

8. All stages below are involved in metabolic pathway that occurred in mitochondria EXCEPT for

• glycolysis

• Krebs cycle

• link reaction

• oxidative phosphorylation

9.Below are four reactions in the Krebs cycle. Which of the following reactions involves a substrate level phosphorylation?

10.What is the end product of pyruvate oxidation?

• Acetyl CoA

• Pyruvate

• Water

•     Phosphoenolpyruvate