The contraction of skeletal muscles is based on _____
A) myosin filaments coiling up to become shorter
B) actin and myosin filaments both coiling up to become shorter
C) actin cross-bridges binding to myosin and transitioning from a high-energy to a low-energy state
D) myosin cross-bridges binding to actin and transitioning from a high-energy to a low-energy state
D
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Which of the following is not a function of the eukaryotic glycocalyx?
A. Adherence B. Reception of chemical signals C. Movement D. Protection
Used to carry the genetic code
(A) Proteins (B) Carbohydrates (C) Nucleic acids (D) Lipids (E) Steroids
Autoimmune diseases occur when
a. autoantibodies are not destroyed and target self antigens. b. T cells that react with self antigens are not destroyed and react with self antigens. c. antibodies target T cells. d. both a and b occur.
Among the mammals, only some primates (including most humans) have color vision. What was the likely advantage that probably drove the evolution of primate color vision?
A. the ability to identify grains most appropriate for domestication B. the ability to find ripe fruit C. the ability to identify plants with medicinal value D. the ability to prepare for winter as portended by autumn colors of leaves E. the ability to enjoy the aesthetic value of flowers