Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 56806
TLS Online TPP Program

#Question id: 12330

Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?

#Unit 10. Ecological Principles
  1. Essentially all of the other species depend on the presence of the elephants to maintain the community
  2. Grazing animals depend upon the elephants to convert forests to grassland.
  3. Elephants prevent drought in African grasslands.
  4. Elephants are the biggest herbivore in this community.

More Questions
TLS Online TPP Program

#Question id: 4571

#Unit 11. Evolution and Behavior

Evolutionary trees such as this are properly understood by scientists to be
TLS Online TPP Program

#Question id: 742

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following

Conformation

Phi

Psi

Omega

A. Alpha helix

I. -57

P. -47

X. 180

B. B sheet

II. -135

Q. +135

Y. 0

C. Polyproline I

III. -83

R. +158

D. Polyproline II

IV. -78

S. +149

TLS Online TPP Program

#Question id: 2655

#Unit 2. Cellular Organization

Lac Operon will be turned on when
TLS Online TPP Program

#Question id: 4582

#Unit 11. Evolution and Behavior

 Fossils found in strata reveal that ________.
TLS Online TPP Program

#Question id: 3616

#Unit 8. Inheritance Biology

If the parents are AO and BO genotypes for the ABO blood group, their children could include which of the following genotypes?