The protection provided through transfer of antibodies from mother to fetus is an example of
A. active immunity.
B. autoimmunity.
C. clonal selection.
D. passive immunity.
E. cell-mediated immunity.
Answer: D
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Given that fertility rate is defined as each woman producing exactly enough offspring to replace herself and her offspring's father, if the fertility rate is sustained for a generation, then _____
A) r = 0 and there is zero population growth B) 0 < r < 1 C) r = 1 D) r > 1 E) population size is at carrying capacity
You have to light a fuse before a firecracker will explode. Would you classify this as an energy- releasing or an energy- absorbing reaction? Please explain your answer
What will be an ideal response?
Gas exchange in the aquatic salamander known as the axolotl is correctly described as
A) active transport to move oxygen into the salamander from the water. B) carrier-mediated transport to move oxygen into the salamander from the water. C) facilitated diffusion of carbon dioxide from the salamander into the water. D) simple diffusion of oxygen into the salamander from the water. E) active transport of carbon dioxide from the salamander into the water.
The thick filament is composed almost entirely of ________ molecules.
A. myosin B. thrombin C. troponin D. tropomyosin E. actin