Practice Questions

TLS Online TPP Program

#Question id: 4001

Which is not true about the lac repressor?

#Unit 1. Molecules and their Interaction Relevant to Biology

Its gene is part of the lac operon and is transcribed along with lacZ, lacA and lacY.
When it binds to DNA, it forms a loop-type structure.
It likely blocks both RNA polymerase binding as well as transcription initiation.
It binds to DNA by interaction of an α-helix with the major groove.

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TLS Online TPP Program

#Question id: 9250

#Unit 9. Diversity of Life Forms

Of the following statements about protected areas that have been established to preserve biodiversity, which one is not correct?

TLS Online TPP Program

#Question id: 9251

#Unit 9. Diversity of Life Forms

Which of the following is responsible for the differences in summer and winter temperature stratification of deep temperate zone lakes?

TLS Online TPP Program

#Question id: 9252

#Unit 9. Diversity of Life Forms

Which of these environmental factor(s) is/are the key determining factor(s) that control(s) the biotic structure of aquatic biomes?

TLS Online TPP Program

#Question id: 9253

#Unit 9. Diversity of Life Forms

A certain species of pine tree survives only in scattered locations at elevations above 2,800 meters in the western United States. To understand why

this tree grows only in these specific places, an ecologist should ________.

TLS Online TPP Program

#Question id: 9254

#Unit 9. Diversity of Life Forms

Organisms evolve over generations to become adapted to the environmental conditions to which they are exposed. The diversity of organisms that

occurs in any particular area thus may be largely determined by the abiotic factors limiting survivorship and reproduction of organisms in a region. Which of the following limit the range of Saguaro cactus in North America?

III) precipitation

IV) temperature

TLS Online TPP Program

#Question id: 9255

#Unit 9. Diversity of Life Forms

Studying species transplants is a way that ecologists ________.