In plants, sporogenous cells divide by mitosis to form spores
___________________ Indicate whether the statement is true or false.
F, meiosis
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Memory cells may take the form of
A. B cells. B. T cytotoxic cells. C. T helper cells. D. All of the choices are correct.
Your friend has a dog Rex that she feeds every night immediately after she gets up from the dinner table. You are dog-sitting one weekend and you decide to keep Rex at your house rather than leave him alone in hers. After you eat dinner and get up to clear the table, Rex starts salivating profusely and runs to his food bowl. Rex's behavior is an example of:
A. an automatic reflex. B. a conditioned response. C. an irrelevant response. D. the anticipatory response. E. permanent conditioning.
A receptor protein in a membrane that recognizes a chemical signal is most similar to __________
A) the active site of an allosteric enzyme in the cytoplasm that binds to a specific substrate. B) RNA specifying the amino acids in a polypeptide. C) a particular metabolic pathway operating within a specific organelle. D) an enzyme with an optimum pH and temperature for activity. E) genes making up a chromosome.
In estimating a fixed effects model using panel data, which of the following variables will not be effective controls if you use a full set of (cross sectional) fixed effects for individuals?
A. Yearly (cumulative) education attainment for individuals B. Birthplace of the individual C. Income taxes paid D. Year to year changes in income for individuals