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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Small lakes and ponds usually lack a profundal zone

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

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

Biology & Microbiology