Small animals such as insects and some lizards are able to “walk on water.” This ability is due
to the
a. strong bonds between oxygen and hydrogen atoms forming the water molecule.
b. attraction among different water molecules due to the unequal attraction of electrons of
hydrogen and oxygen in individual water molecules.
c. bonds that form between two atoms that are oppositely charged.
d. strong bonds that form between water molecules due to sharing of electrons in the same
orbit.
B
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The pattern of leaf arrangement on a stem is called
A. protodermis. B. phyllotaxy. C. nodular termini. D. meristematic spacing. E. axillary arrangement.
Which of the following is incorrect about stimulation of striated muscle contraction by the neuromuscular junction?
A) Acetylcholine is stored in vesicles in the axon terminal. B) Acetylcholine is secreted in response to a nerve action potential. C) Acetylcholine binds to soluble receptors in the extracellular environment. D) Acetylcholine binding stimulates sodium ions to enter the muscle cell. E) T tubules carry action potentials into the muscle cell.
The promoter in Figure 14-1 is labeled __________
a. 6 b. 3 c. 1 d. 2 e. 7
A nonreciprocal crossover causes which of the following products?
A) deletion only B) duplication only C) nondisjunction D) deletion and duplication