What type of species, if removed from the community, could lead to the collapse of the entire community?
A. Invasive species
B. Indicator species
C. Keystone species
D. Flagship species
Answer: C
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Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
A) The light reactions provide ATP and NADPH to the Calvin cycle, and the Calvin cycle returns ADP, i, and NADP+ to the light reactions. B) The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions. C) The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP. D) The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides the light reactions with water to split. E) There is no relationship between the light reactions and the Calvin cycle.
Antibody molecules ____
a. are secreted by B cells and T cells b. stay attached to the B cell membrane as B cell receptors c. inactivate complement proteins d. prevent phagocytosis e. can each bind to many different antigens
The erythrocyte anion exchange protein "ping-pong" transport mechanism involves
A) binding of Cl? on one side of the membrane. B) binding of bicarbonate ion on one side of the membrane. C) unidirectional transport of Cl? only out of the cell. D) two conformational states of the protein. E) All are involved in the mechanism.
Proteins contain twenty different subunits ____
a. that are the carriers of genetic information b. arranged in a double helix attached to DNA c. including thymine, cytosine, guanine, and adenine d. in the form of nucleotides e. in the form of amino acids