Which of the following is the least reliable form of contraception?
a. condoms
b. sterilization
c. withdrawal
d. oral hormonal
c. withdrawal
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For each structure described below, choose the cytoskeletal element that it best characterizes: a. microtubules b. microfilaments c. intermediate filaments
________ the cytoskeletal elements with the widest diameter ________ the cytoskeletal elements with the narrowest diameter _______ double helices of polymerized actin proteins ________ strong fibers of more than a hundred different types ________ hollow tube-like structures made of polymerized tubulin protein dimers ________ proteins in the nucleus which give shape and support the nuclear envelope What will be an ideal response?
A marine biologist makes a presentation about crustaceans to your biology class. He explains that he has recently received an NSF grant to study sessile crustaceans. You are only aware of one group of sessile crustaceans. This crustacean must be
A. a lobster. B. a crayfish. C. a shrimp. D. a barnacle. E. the nauplius.
Chromosomes condense during what phase of mitosis?
a. prophase b. prometaphase c. metaphase d. anaphase
Which macronutrient serves a role in enzyme function support, as well as nutrient transport regulation?
a. magnesium b. potassium c. calcium d. nitrogen