The complement cascade can be activated by binding to
A) natural killer cells only.
B) antibodies attached to bacterial cells only.
C) carbohydrates present on bacterial cells only.
D) either carbohydrates or antibodies on bacterial cells.
E) either natural killer cells or carbohydrates on bacterial cells.
Answer: D) either carbohydrates or antibodies on bacterial cells.
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What biogeochemical cycles have been heavily affected by human activities? Check all that apply.
_____ the water cycle _____ the phosphorus cycle _____ the nitrogen cycle _____ the carbon cycle
The two major categories of extracellular signaling molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones b. steroid hormones and neurotransmitters c. neurotransmitters and vitamins d. growth hormones and vitamins e. peptide hormones and neurotransmitters
Genes may be
a. turned on and off. b. never turned on. c. turned on and left on. d. activated for only a short time in one cell and a long time in another cell. e. all of these
The mating of totally unrelated homozygous strains of corn produced a new strain of corn that was
very different from both parental strains in many characteristics. Give some reasons to explain this phenomenon What will be an ideal response?