#Question id: 1156
#Unit 4. Cell Communication and Cell Signaling
Which of the following mechanisms cannot terminate an intracellular signaling pathway once the concentration of an external signal decreases?
#Question id: 3487
#Unit 11. Evolution and Behavior
Which of the following is true of innate behaviors?
A) Genes have very little influence on the expression of innate behaviors.
B) Innate behaviors tend to vary considerably among members of a population.
C) Innate behaviors are limited to invertebrate animals.
D) Innate behaviors are expressed in most individuals in a population across a wide range of environmental conditions.
E) Innate behaviors occur in invertebrates and some vertebrates but not in mammals.
#Question id: 1678
#Unit 4. Cell Communication and Cell Signaling
What does the MHC class I heavy chain consists of?
#Question id: 12131
#Unit 10. Ecological Principles
Use the following diagram of a hypothetical food web to answer the following questions. The arrows represent the transfer of food energy between the various trophic levels.
Which letter represents an organism that could be a producer?
#Question id: 15894
#Unit 12. Applied Biology