Capacitation lasts several ________ and involves removal of ________.
A. seconds; lipids from the surface of the egg
B. weeks; glycolipids from the surface of the sperm
C. days; carbohydrates from the surface of the egg
D. hours; proteins from the surface of the sperm
Answer: D
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Injury to this nerve causes the condition known as sciatica.
A. Genitofemoral nerve B. Sciatic nerve C. Tibial nerve D. Femoral nerve E. Obturator nerve
Skin wrinkles with age because
A) collagen degrades in the subcutaneous layer as the epidermis shrinks. B) the number of sweat glands diminishes. C) fat is lost from the subcutaneous layer and the dermis shrinks. D) epidermal cells undergo a burst of cell division.
The ________ is the gonad and the ________ is the gamete
A) semen; sperm B) sperm; semen C) testis; ovary D) testis; semen E) testis; sperm
Degeneration of the neurons in which of the following structures leads to the muscle tremors associated with Parkinson disease?
A. Tegmentum B. Cerebral cortex C. Pons D. Inferior colliculi E. Substantia nigra