Hemoglobin in the embryo consists of
A) two epsilon chains and two zeta chains.
B) two gamma chains and two alpha chains.
C) two gamma chains and two beta chains.
D) one alpha chain, one beta chain, one epsilon chain, and one gamma chain.
A) two epsilon chains and two zeta chains.
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Species of the genus Gardnerella
A. are normal flora found on the skin of humans. B. are motile spore-forming cocci. C. are thought to be a major cause of bacterial vaginitis. D. All of the choices are correct.
Protein digestion begins in the _____
a. mouth b. stomach c. small intestine d. large intestine
The portion of the bone labeled I in the accompanying figure is called the:a
periosteum. b. lacunae. c. epiphysis. d. osteon. e. metaphysis
Thick, smooth muscle located at the junction of the bladder and urethra that aids in pushing stored urine into the urethra is called the ________
A) medial urethral sphincter B) internal urethral sphincter C) external urethral sphincter D) urinary sphincter