Spermatogenesis takes place in which of the following structures?
a. seminiferous tubules
b. seminal vesicles
c. prostate gland
d. bulbourethral glands
e. glans
a
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According to Donald Perry, how do rainforest birds interact with the Norantea sessilis vine?
a. Birds nest within the shelter of the thorny vine, which repels predators. b. Birds feed on the fruits of the vine, distributing the seeds around the forest in their droppings. c. Birds appear to be overfeeding on the vine's succulent fruits, probably limiting the plant's chances of long-term survival. d. Birds that feed on the nectar of the flowers inadvertently transfer pollen from one vine to another on their feet. e. Birds that feed on the nectar of the flowers inadvertently transfer pollen from one vine to another on their beaks.
Enzymes can catalyze a reaction only if
a. they encounter a molecule of ATP. b. their active site is sufficiently oxidized. c. they have both products in their active site at the same time. d. they encounter a substrate that fits their active site.
Isotopes of atoms ____.
A. have the same number of neutrons but a different number of protons B. behave the same chemically and biologically from other isotopes C. are the same physically and biologically but differ from other isotopes chemically D. have the same number of protons but a different number of electrons E. are produced when atoms lose electrons
The therapeutic range of an antimicrobial is the
A) ratio of the dose a patient can tolerate to the effective dose. B) range of microorganisms the antimicrobial effects. C) range of concentrations at which the antimicrobial is both effective and non-toxic. D) ratio of the concentration of antimicrobial in the blood to the oral dose. E) length of time the medication persists in the body after a single dose.