Many plants wind up with a Na+ concentration that is considerably lower than that of the surrounding soil. What plays a key role in allowing for such a difference to exist?
a. endodermis
b. tonoplast
c. aquaporin
d. water potential
Answer: a. endodermis
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The resistance of Archaeans to extremes of temperature, salinity, and pH is thought to be due to what structural feature?
a. covalent crosslinking among membrane phospholipids b. phospholipids that spin, drift, and wiggle without leaving the bilayer c. membrane proteins that are covalently bonded together d. high proportion of unsaturated fatty acids in phospholipids
Which muscle lifts and braces the shoulder?
a. biceps brachii b. pectoralis major c. triceps brachii
d. deltoid e. trapezius
The formation of female gametes is termed:a
oogenesis. b. macrogenesis. c. spermatogenesis. d. ovogenesis. e. microgenesis.
A sexually active 27-year old man complains of a greenish-yellow discharge from his urethra and difficulty urinating. A Gram-negative diplococcus was seen on the gram stain. Confirmation by culture requires plating on which of the following media?
A. EMB Agar B. Lowenstein-Jensen agar C. MacConkey agar D. Mannitol salts agar E. Choclate agar