Define metabolism
What will be an ideal response?
ANSWER: Metabolism is the total of all of the chemical reactions in a cell. These reactions can be
catabolic or anabolic and are used to synthesize new molecules or extract energy from
molecules to power cellular work.
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Meiosis I results directly in the production of
a. spermatids. b. spermatogonia. c. primary spermatocytes. d. secondary spermatocytes. e. sperm.
The cell surface receptors that can act only indirectly on plasma membrane-bound enzymes or ion channels are called:
A. G protein-coupled receptors. B. enzymatic receptors. C. gated ion channels. D. second messenger receptors.
Which pair demonstrates a mutualistic relationship?
a. orchid and its host b. rhizobia and strawberry plants c. soil fungus and soil bacteria d. mistletoe and its host e. mychorrhizae and roots
Which of the following is true of intercellular junctions, such as tight junctions, desmosomes, and gap junctions?
a. They are specialized forms of communication among nerve cells. b. They are of primary importance in the contraction of skeletal muscle fibers. c. They are equally distributed among all tissue types. d. They help to integrate cells into a functioning unit. e. They aid in distributing DNA among cells.