The permeability of the plasma membrane to mineral ions
A. is only possible because of the hydrophobic interior of the lipid bilayer.
B. is affected by differences in electrical charge on the two sides of the membrane.
C. is the same in all cell types.
D. is zero in all living cells.
E. is not influenced by channels formed by proteins.
Answer: B
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When adenyl cyclase is activated,
A) ATP is consumed. B) cAMP is formed. C) cAMP is broken down. D) ATP is produced. E) ATP is consumed and cAMP is formed.
Which of the following statements regarding vision is FALSE?
A. Cataract is an increase in opacity (clouding) of the lens. B. Presbyopia is a condition in which the lens cannot accommodate adequately for near vision. C. The image of an object that is focused on the retina is upside down relative to the object's actual position in space. D. Myopia is a condition in which the lens focuses light from distant objects behind the retina. E. The cornea refracts light rays more strongly than the lens.
What do sutures, gomphoses, and syndesmoses have in common?
A. These are all bony joints. B. These are cartilaginous joints. C. These are joints found only in the axial skeleton. D. These are all fibrous joints. E. These are joints found only in the appendicular skeleton.
Lacteals are
A. a type of lymphocyte. B. a nonspecific defense. C. lymphatic vessels in the lining of the small intestine. D. the sinuses inside a lymph node. E. germinal centers.