In photosynthesis, water is used as a source of replacement electrons for _______.
a) the Calvin cycle
b) the citric acid cycle
c) photosystem II
d) the electron transport chain
Answer: c) photosystem II
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Members of the genus Rhizobium
A. infect broad-leaved plants and cause crown gall disease. B. are important nitrifying bacteria that convert nitrite to nitrate. C. are free living soil bacteria that fix nitrogen. D. grow symbiotically in root nodules of legumes where they fix nitrogen.
After mutations begin a cancer, other factors that influence whether the disease proceeds include
A) how old a person is and whether he or she smokes. B) whether a person has had cancer before and its location in the body. C) location of the cancerous cell in the tissue and how specialized the cell is. D) whether or not a person's relatives have cancer.
Before a prokaryotic mRNA can be translated, it must be modified by the addition of a polyA tail
Indicate whether the statement is true or false
The ________ stage of a protozoan is the actively feeding and reproducing stage.
A. trophozoite B. cyst C. cysticercus D. encysted E. merozoite