Practice Questions

TLS Online TPP Program

#Question id: 11970

Why do the cells of the digestive system secrete proteolytic enzymes, such as pepsin, in their inactive forms?

#7. System Physiology – Animal

These proteolytic enzymes, in active form, would digest the very tissues that synthesize them.
By secreting inactive enzymes, the catalytic activity of the enzymes is maintained for a longer time.
The stomach is too acidic to maintain these enzymes in their active form.
Inactive pepsin and trypsin are more easily transported across the cell membrane

More Questions

#Question id: 3273

#11. Evolution and Behavior

The number of forward mutations is equal to the number of reverse mutations then

a) Population is in equilibrium for forward and reverse mutation rates

b) The population is being in Hardy–Weinberg equilibrium

c) No further change in allelic frequency

#Question id: 3276

#11. Evolution and Behavior

Which of these conditions are always true of populations evolving due to natural selection?

Condition 1: The population must vary in traits that are heritable.

Condition 2: Some heritable traits must increase reproductive success.

Condition 3: Individuals pass on most traits that they acquire during their lifetime.

#Question id: 3277

#11. Evolution and Behavior

Which of the following describes the most likely order of events in allopatric speciation?

#Question id: 3278

#11. Evolution and Behavior

What does the biological species concept use as the primary criterion for determining species boundaries?

#Question id: 3279

#11. Evolution and Behavior

Which two of the following have operated to increase divergence between mosquito fish populations on island?

a. improved gene flow

b. bottleneck effect

c. sexual selection

d. founder effect

e. natural selection

#Question id: 3280

#11. Evolution and Behavior

Small populations are threatened by the loss of genetic diversity from

a. Inbreeding

b. Genetic drift

c. Limited mating