A cell that is 98% water is placed in a solution containing 3% salt. This cell is now _________ compared to its surroundings.
A. isotonic
B. hypertonic
C. hypotonic
D. hydrophilic
C. hypotonic
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In a study often referred to as the "casual sex study," randomly selected men and women were asked if they would like to have sex with the experimenter. Men turned out to be more likely to accept this proposal than women. This is most likely because:
a) men are trying to get in as many matings as possible to lower the variance reproductive success, but women already have low variance in reproductive success. b) men are consciously trying to maximize their reproductive success while women are responding by rules of thumb. c) the female experimenter propositioning the men was far more attractive than the male experimenter propositioning the women thus the experiment was poorly designed giving biased results. d) men have a lower initial investment than women so they will be less discriminating in choosing a mate. e) men benefit from additional matings while women do not.
Which of the following bacteria can cause life-threatening pseudomembranous colitis?
A) Clostridium difficile B) Staphylococcus aureus C) Streptococcus pyogenes D) Enterococcus species E) Clostridium botulinum
Phospholipase C hydrolyzes a membrane phospholipid to produce
A. IP3 only. B. protein kinase C only. C. diacylglycerol only. D. both IP3 and protein kinase C. E. both IP3 and diacylglycerol.
A neurotransmitter that was excitatory would produce an ______ that would ____ the postsynaptic neuron.
A. EPSP, depolarize B. EPSP, hyperpolarize C. IPSP, depolarize D. IPSP, hyperpolarize E. IPSP, not affect