In which of the following pairs are the organisms most closely related taxonomically?
A. mushroom...oak tree
B. spider...crayfish
C. Bacterium ... paramecium
D. Sea star..clam
E. rosebush..diatom
Answer: B. spider...crayfish
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Homologous chromosomes pair with each other during meiosis, but are misaligned. Which of the following is a possible outcome if crossing over occurs?
A. One daughter chromosome contains a gene duplication. B. One daughter chromosome contains a gene deletion. C. Two daughter chromosomes each contain a gene duplication. D. Two daughter chromosomes are normal. E. One daughter chromosome contains a gene duplication, one daughter chromosome contains a gene deletion, and two daughter chromosomes are normal.
When ATP levels are high, which enzyme's activity will be directly decreased by feedback inhibition?
a. aconitase b. malate dehydrogenase c. citrate synthase d. isocitrate dehyrogenase e. fumerase
Which of the following is NOT one of the body's nonspecific defenses against pathogens?
A) complement system B) inflammation C) natural killer cell D) cytotoxic T cell E) interferons
Small lakes and ponds usually lack a profundal zone
____________________ Indicate whether the statement is true or false.