Practice Questions

TLS Online TPP Program

#Question id: 12341

The figure shows population growth trajectories over time (as indicated by the arrows) of two stored-grain beetle species when grown together under constant conditions. Three experiments were performed that differed only in the initial densities of the two species. Which of the following is the best interpretation of the experimental results?

#Unit 10. Ecological Principles

Population growth is random (unpredictable) for each species.
No equilibrium exists in which both species can coexist.
Interspecific competition is stronger than intraspecific competition.
Density dependence within each species is stronger than interspecific competition.

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TLS Online TPP Program

#Question id: 10810

#Unit 6. System Physiology – Plant

A mechanism for preventing sap loss entails closing sieve plate pores with callose, which is

TLS Online TPP Program

#Question id: 19924

#Unit 12. Applied Biology

Synthesis of Barnase protein, an RNase, in such cells that are infected by a fungal pathogen leads to their

TLS Online TPP Program

#Question id: 15811

#Unit 5. Developmental Biology

In XX Drosophila, which gene is activated during the first 2 hours after fertilization?

TLS Online TPP Program

#Question id: 18584

#Unit 7. System Physiology – Animal

Stepping back to a simpler life is known as ______.

TLS Online TPP Program

#Question id: 15785

#Unit 5. Developmental Biology

During the formation of induced pluripotent stem cell, what is the function of Sox2 and Oct4?

A. Established pluripotency and blocked differentiation.

B. Opened up chromatin

C. Activation of Nanog.

D. Promotes cell growth and proliferation