Two plant species co-occur in a prairie. Species X always occurs near species Y. However, species    often occurs in isolation from species X and produces more seeds when alone than when growing next to species X. Which of the following interactions between species X and Y could generate this pattern?

TLS Online TPP Program

#Question id: 32407

#Unit 1. Molecules and their Interaction Relevant to Biology

Deuterated acetyl-coenzyme A (-CD3 instead of –CH3) was used in an experiment to study the TCA cycle. Upon analysis of the metabolites, it was found that deuterium (D) was present in a wide variety of compounds; even compounds not associated with the citric acid cycle. This is due to

TLS Online TPP Program

#Question id: 32408

#Unit 1. Molecules and their Interaction Relevant to Biology

What would result if 14CO₂ were incorporated into the TCA cycle via the pyruvate carboxylase reaction.

TLS Online TPP Program

#Question id: 32409

#Unit 1. Molecules and their Interaction Relevant to Biology

What will be the fate if methyl-labeled acetyl-CoA was fed to the conventional TCA cycle.

TLS Online TPP Program

#Question id: 32410

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements is false.

a. Pyruvate dehydrogenase is inhibited by NADH.

b. Pyruvate dehydrogenase is inhibited by ATP.

c. Citrate synthase is inhibited by NADH.

d. Succinyl-CoA activates citrate synthase.

e. Acetyl-CoA activates pyruvate carboxylase.

TLS Online TPP Program

#Question id: 32411

#Unit 1. Molecules and their Interaction Relevant to Biology

Activity of citrate synthase from pig heart tissue shows a sigmoid dependence on the concentration of acetyl-CoA. Which of the following statement is correct.

TLS Online TPP Program

#Question id: 32509

#Unit 1. Molecules and their Interaction Relevant to Biology

Inner mitochondrial membrane is highly impermeable and it has