Sperm are stored in the:
a. vas deferens
b. epididymis
c. prostate
d. scrotum
e. urethra
b
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Rhizobium is considered an endosymbiont with plants
Indicate whether this statement is true or false.
The several species of finches that developed on the group of islands in the Galápagos are an example of
A. convergent evolution. B. adaptive radiation. C. divergent evolution. D. polyploidy.
Phosphofructokinase is an important control enzyme in the regulation of cellular respiration. Which of the following statements concerning phosphofructokinase is not true?
A) It is activated by AMP (derived from ADP). B) It is inhibited by ATP. C) It is activated by citrate, an intermediate of the citric acid cycle. D) It specifically catalyzes the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate, an early step of glycolysis. E) It is an allosteric enzyme.
Why do new red blood cells survive for only a few months?
A) The oxygen that red blood cells carry damages their organelles. B) Red blood cells do not have most organelles or a nucleus. C) The heart pumps red blood cells so often that their membranes deteriorate. D) The hemoglobin that red blood cells carry is toxic.