Practice Questions

TLS Online TPP Program

#Question id: 4632

Which of these conditions should completely prevent the occurrence of natural selection in a population over time?

#Unit 11. Evolution and Behavior

All variation between individuals is due only to environmental factors.
The environment is changing at a relatively slow rate.
The population size is large.
The population lives in a habitat where there are no competing species present.

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TLS Online TPP Program

#Question id: 4705

#Unit 11. Evolution and Behavior

Darwin and Wallace's theory of evolution by natural selection was revolutionary because it ________.

TLS Online TPP Program

#Question id: 2830

#Unit 2. Cellular Organization

The NtrC protein from E. coli

a. is a σ54 RNA polymerase.

b. stimulates transcription of the glnA gene.

c. is activated by a protein kinase called NtrB.

d. binds both to an enhancer site upstream of the glnA gene and to RNA polymerase.

e. has ATPase activity.

TLS Online TPP Program

#Question id: 17085

#Unit 12. Applied Biology

Spontaneous cell fusion occurs at a very low rate. Enhanced fusion can be done by

1. Sendai virus

2. Polyethylene glycol

Which of the above mentioned can be used for fusion experiments?

TLS Online TPP Program

#Question id: 24202

#Unit 4. Cell Communication and Cell Signaling

Homophilic Binding appears:

TLS Online TPP Program

#Question id: 15778

#Unit 5. Developmental Biology

Stem cell regulation is highly influenced by the microenvironment that surrounds a stem cell and is known as the