Homeostasis is maintained using negative feedback loops. Which part of a negative feedback loop detects conditions?
A. effector
B. sensor
C. response
D. stimulus
E. integrating center
Answer: B
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_____ are close interactions between species that have evolved over long periods of time. When these interactions enhance the reproduction and population growth of both species, they are called _____
A. Symbioses; mutualisms B. Mutualisms; symbioses C. Symbioses; antagonisms D. Antagonisms; symbioses E. Antagonisms; mutualisms F. Mutualisms; antagonisms
When Calvin injected 14C labeled CO2 into cultures of green algae, what led him to conclude that rubisco adds CO2 to ribulose bisphosphate in the Calvin cycle?
A. Radioactivity appeared last in ribulose bisphosphate. B. Radioactivity first appeared in glucose. C. Radioactivity first appeared in ribulose bisphosphate. D. Radioactivity appeared last in glucose. E. Radioactivity first appeared in 3-phosphoglycerate. F. Radioactivity appeared last in 3-phosphoglycerate
Other than the molecules they express, what is the difference between a CD4+ and an CD8+ T cell?
a. When activated, a CD8+ T cell becomes a helper T cell, and a CD4+ T cell becomes a cytotoxic T lymphocyte. b. Stimulated CD8+ T cells are implicated heavily in allergic reactions, and CD4+ T cells are not. c. When activated, a CD4+ T cell becomes a helper T cell, and a CD8+ T cell becomes a cytotoxic T lymphocyte. d. Both are naïve cells, but only CD4+ T cells can differentiate when stimulated.
Which of the following statements about phospholipids is false?
a. They are amphipathic molecules. b. They contain three fatty acids chains. c. They contain a polar organic group attached to a phosphate group. d. They have cylindrical shapes that allow them to associate with water most easily as a bilayer structure. e. They have two distinct regions, one strongly hydrophobic and the other strongly hydrophilic.