Practice Questions

TLS Online TPP Program

#Question id: 2675

Which of the following statements regarding the trp operon is true?

#Unit 2. Cellular Organization

The operator region produces the mRNA that codes for the repressor.
Repressor proteins are inactivated by the presence of the repressor.
The regulatory gene is not transcribed in the presence of the repressor.
The trp operon is always activated unless deactivated by a repressor.

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TLS Online TPP Program

#Question id: 16493

#Unit 12. Applied Biology

35S promoter sequences derived from cauliflower mosaic virus shows which type of expression.

TLS Online TPP Program

#Question id: 12457

#Unit 10. Ecological Principles

A _______________ survivorship curve is most typical of an opportunistic species.

TLS Online TPP Program

#Question id: 12048

#Unit 7. System Physiology – Animal

A 10-year-old boy consumes a cheeseburger, fries, and chocolate shake. The meal stimulates the release of several gastrointestinal hormones. The presence of fat, carbohydrate, or protein in the duodenum stimulates the release of which of the following hormones from the duodenal mucosa?

TLS Online TPP Program

#Question id: 13134

#Unit 10. Ecological Principles

Which of the graphs below represents the relationship between population size (N) and population growth rate (dN/dt) for a population showing exponential growth?

TLS Online TPP Program

#Question id: 4568

#Unit 11. Evolution and Behavior

In Darwinʹs thinking, the more closely related two different organisms are, the