Archaeal membranes contain which of the following lipids?
A. Glycolipids
B. Phospholipids
C. Sulfolipids
D. All of the choices are correct.
Answer: D
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In temperate-zone lakes, a __________ and a fall
overturn cause vertical mixing of waters and trigger a burst of productivity. Fill in the blank(s) with the appropriate word(s).
Embryonic endoderm gives rise to:
a. muscle. b. the lining of the digestive tract. c. the nervous system. d. skin. e. skeletal tissue
In DNA, a purine must always pair with a pyrimidine and vice versa in order to ensure that
A. each base pair is held together by three hydrogen bonds. B. the distance between the two phosphodiester backbones remains constant. C. the two strands are antiparallel. D. the distance between one base pair and the next remains constant.
Officials associated with international track and field competitions have noted an increase in the number of athletes who use a synthetic form of erythropoietin. Athletes use this drug because it
A) stimulates the release of ADH, which then goes on to cause an increase in the number of red blood cells and helps athletes increase their aerobic capacity for an event. B) increases urine output so that they can shed weight just prior to an important competition. C) increases the number of oxygen-transporting red blood cells, which helps athletes increase their aerobic capacity for an event. D) decreases blood pressure so that they can be more focused and relaxed during a competition.