What is the function of tropomyosin in muscle cells?
A. Tropomyosin binds to actin molecules and
brings about shortening of the muscles.
B. Tropomyosin covers the myosin binding
sites on the actin molecules, preventing
contraction from occurring.
C. Tropomyosin is the contractile unit of the
muscle cell.
D. Tropomyosin stores calcium.
B
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The equation (N/t)/N1 (where N denotes the size of a population and t represents time) is used to calculate:
A. a habitat's carrying capacity. B. the "available" percentage of a habitat's carrying capacity. C. a population's density. D. a population's intrinsic growth rate. E. Euler's number.
During glycolysis molecules of glucose are
A. broken down by enzymes to form two molecules of pyruvate. B. bonded by enzymes to form three molecules of pyruvate. C. broken down into three molecules of pyruvate. D. broken down in oxidation, and releasing carbon atoms as CO2. E. bonded covalently to form two molecules of pyruvate.
Skin is able to prevent most microorganisms from entering the body by
A) producing alkaline secretions. B) having keratin in the uppermost layer. C) production of antibodies. D) the adhesion junction in the skin preventing bacteria from entering. E) releasing macrophages on the skin surface.
Character displacement makes competing species less similar, which facilitates __________.
Fill in the blank(s) with the appropriate word(s).