The action spectrum of higher plants is bimodal, with two major peaks. Which two molecules largely determine the
two peaks?
a. photosystems I and II
b. P680 and P700
c. chlorophyll a and chlorophyll b
d. chlorophyll and carotenoid
e. ATP and NADH
ANSWER: c
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Recombination between homologous chromosomes:
A. can lead to a gene conversion event if the region between the two Holliday intermediates contains base pair differences. B. uses extended synthesis-dependent strand annealing (ESDSA) rather than synthesis-dependent strand annealing (SDSA). C. can occur at completely random sites on the chromosome; there is no apparent regulation of the process. D. occurs between sister chromatids and nonsister chromatids with equal frequency. E. None of the choices given is true.
The ____ gland is associated with biological clocks or biorhythms
a. pineal b. parathyroid c. hypothalamus d. pituitary e. thymus
Which of the following statements is false?
a. Only B cells and their progeny make antibodies. b. The primary immune response is faster and more complete than a secondary immune response. c. Naive B cells already have antibodies but have not yet encountered an antigen. d. Macrophages will digest invading bacterial cells but do not destroy the antigens that eventually become mounted on their surfaces. e. B cell progeny may differentiate into memory cells.
Normal blood pressure in millimeters of mercury is
a. 145/95 for males and 135/85 for femals b. 130/100 for both c. 120/80 for males and 110/70 for females d. 100/50 for males and 120/70 for females