The rusts and smuts that seriously affect crop plants are
A. basidiomycetes.
B. zygomycetes.
C. ascomycetes.
D. actinomycetes.
E. chytrids.
Answer: A
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During anaphase I, which best represents segregation of the chromatids that make up one pair of homologues? (M represents a maternal chromatid and P represents a paternal chromatid. Assume no crossing over occurs.)
A. M and M to one pole; P and P to the other pole. B. M and P to one pole; M and P to the other pole. C. M to one pole; P to the other pole. D. half of M and half of P to each pole. E. the segregation of these chromatids is completely random.
Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. epistasis. B. nondisjunction. C. crossing over. D. pleiotropy. E. chromosome inactivation.
An antigen is:
a. a phagocytic cell. b. used to combat infections. c. a molecule used by bacteria to destroy antibodies. d. any molecule that is recognized as foreign by the immune system. e. produced by a white blood cell.
Out of the estimated total of 9 liters of material passing through the small intestine, how much of it is absorbed in the small intestine?
A. about 8.5 liters B. about 4.5 liters C. about 350 milliliters D. about 50 milliliters E. all of it