PCA BIOLOGY

Which statement BESTLY explain about biological species concept?

• Individuals of different species interbreed each other produce sterile offspring

• Individuals of different species interbreed each other produce fertile offspring

• Individuals of same species interbreed each other produce sterile offspring

• Individuals of same species interbreed each other produce fertile offspring

1.       Which statement are TRUE about enzyme?

I. Catalyze reversible reaction

II. Required in large amount

III. All are fibrous protein

• I only

• I and II only

• I and III only

• I, II and III

Yeast undergoes fermentation produce following products including

• NAD⁺ and lactate

• NAD⁺ and ethanol

• NADH and lactate

• NADH and ethanol

Which molecule represent four-carbon compound in Krebs cycle?

I. Malate

II. Citrate

III. Succinate

• I only

• I and II

• I and III

• I, II and III

How sympatric speciation occurs in maggot flies?

• Reproductive isolation due to temporal isolation

• Reproductive isolation due to habitat isolation

• Reproductive isolation due to mechanical isolation

• Reproductive isolation due to gametic isolation

According to IUBMB, class of enzyme that catalyse reaction below:

                            Malate --> Pyruvate + CO₂

• Hydrolases

• Transferases

• Lyases

• Ligases

   

Which reaction produce ATP?

I. 1,3-bisphosphoglycerate --> 3-phosphoglycerate

II. Pyruvate --> phosphoenolpyruvate

III. Succinyl CoA --> Succinate

• I only

• I and II only

• I and III only

• I, II and III

Which statement are TRUE about cofactor?

• Coenzymes is organic molecules that bind permanently to the enzyme

• Prosthetic group is organic molecules that bind loosely to the enzyme

• Coenzymes is organic molecules that bind loosely to the enzyme

• Prosthetic group is inorganic molecules that bind loosely to the enzyme

Galapagos finches undergoes which type of evolutionary process

I. Sexual selection

II. Temporal isolation

III. Adaptive radiation

• I only

• I and II only

• I and III only

• I, II and III

Which reaction occur when pyruvate enters mitochondria?

I. Oxidation

II. Reduction

III. Decarboxylation

• I only

• I and II only

• I and III only

• I, II and III