You are comparing the events of meiosis I in cells from several different organisms. You come across one species in which you do not observe any chiasmata. The best conclusion to make is
A. there is no crossing over between non-sister chromatids
B. kinetochores of sister chromatids do not fuse
C. the chromosome pairs will not assort independently
D. chiasmata will form during meiosis II
A. there is no crossing over between non-sister chromatids
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Which of the following choices is not an effect of cortisol?
a. controls sodium and water reabsorption in the kidneys b. signals skeletal muscles to degrade proteins c. induces liver cells to break down glycogen d. triggers adipose cells to degrade fats
Osmosis in capillary exchange takes place in
response to
a. high oxygen concentrations. b. low oxygen concentrations. c. high plasma protein concentrations. d. low plasma protein concentrations. e. high carbon dioxide concentrations.
One important regulation point in the aerobic respiration of mammals occurs in glycolysis at the site of
the enzyme phosphofructokinase, which is: a. inhibited by high levels of ATP. b. inhibited by low levels of ATP. c. inhibited by high levels of AMP. d. activated by the presence of O2. e. activated by the introduction of glucose
Crossing-over is
A) the place on a homologous pair of chromosomes at which a physical exchange occurs. B) an extremely rare event. C) an event that only takes place during meiosis. D) the reciprocal exchange of homologous regions of chromatids. E) not useful in mapping genes.