Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 8326
TLS Online TPP Program

#Question id: 11544

When a steroid hormone and a polypeptide hormone exert similar effects on a population of target cells, then ________.

#Unit 7. System Physiology – Animal
  1. the steroid and polypeptide hormones must use the same biochemical mechanisms
  2. the steroid and polypeptide hormones must bind to the same receptor protein
  3. the steroid hormones affect the synthesis of effector proteins, whereas polypeptide hormones activate effector proteins already present in the cell

  4. the steroid hormones affect the activity of certain proteins within the cell, whereas polypeptide hormones directly affect the processing of mRNA

More Questions
TLS Online TPP Program

#Question id: 12552

#Unit 10. Ecological Principles

To measure the population of lake trout in a 250 hectare lake, 200 individuals were netted and marked with a fin clip, and then returned to the lake. The next week, the lake is netted again, and out of the 200 lake trout that are caught, 50 have fin clips. Using the capture-recapture estimate, the lake trout population size could be closest to which of the following?
TLS Online TPP Program

#Question id: 12553

#Unit 10. Ecological Principles

Which of the following assumptions have to be made regarding the capture -recapture estimate of population size?
I. Marked and unmarked individuals have the same probability of being trapped.
II.    The marked individuals have thoroughly mixed with population after being marked.
III.  No individuals have entered or left the population by immigration or emigration, and no individuals have been added by birth or eliminated by death during the course of the estimate.
TLS Online TPP Program

#Question id: 12554

#Unit 10. Ecological Principles

Long-term studies of Belding's ground squirrels show that immigrants move nearly 2 km from where they are born and make up 1 to 8% of the males and 0.7 to 6% of the females in other populations. On an evolutionary scale, why is this significant?
TLS Online TPP Program

#Question id: 12555

#Unit 10. Ecological Principles

Demography is the study of
TLS Online TPP Program

#Question id: 12556

#Unit 10. Ecological Principles

Natural selection has led to the evolution of diverse natural history strategies, which have in common
TLS Online TPP Program

#Question id: 12557

#Unit 10. Ecological Principles

Natural selection involves energetic trade-offs between