Four of the five answers represent costs of living in groups. Select the exception
a. susceptibility to infectious disease
b. risk of cannibalization of eggs or nestlings
c. risk of predation
d. competition for resources
e. competition for space
c
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Acetylcholine binds this membrane protein, which subsequently opens to allow sodium to enter the cell. Acetylcholine exerts its effect on what type of transport protein?
A. ligand-gated channel B. voltage-gated channel C. mechanosensitive-gated channels D. regulatory protein-gated channels E. stretch-sensitive gated channels
Which of the following is/are means whereby a catalyst can lower the activation energy of a reaction?
A) decreasing the number of reactive molecules B) altering the temperature within the cell to one appropriate for reactions to proceed C) quantum tunneling D) inefficient collisions E) permanently binding substrates
The ABO blood types have ____ different genotypes
a. 4 b. 6 c. 8 d. 12 e. 16
The type of support illustrated in Figure 40-2 is:
a. a hydrostatic skeleton. b. an exoskeleton. c. the integumentary system. d. a shell. e. the dermis.