Why is it beneficial to urinate after sexual activity? What will be an ideal response?
ANSWER: During sexual activity, microorganisms and/or substances that can feed microorganisms can
end up in the urinary tract. By urinating, both the mechanical action of the flow and the low
pH of the urine itself can clean the urinary tract and reduce the risk of infection.
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Osmosis can only occur if water travels through the
A. cell wall. B. semi-permeable membrane. C. vacuole. D. ER. E. cytoskeleton.
Which of the following statements is false?
A. The rapid depolarization phase of the action potential in pacemaker cells results from the influx of sodium through voltagegated sodium channels. B. The repolarization of the pacemaker cells following an action potential allows for the heart to relax between contractions. C. The resting membrane potential of cardiac pacemaker cells gradually becomes less negative on its own. D. Pacemaker cells repolarize by opening voltage-gated potassium channels. E. None of the answer options is false.
The consensus sequences are 5'TTGACA3' and 5'TATAAT3' at -35 and -10 respectively. Which of the following would be most easily recognized by ? factor?
A. 5'TTGAAA3' B. 5'TAAATT3' C. 5'TATATA3' D. 5'TTCAGA3'
The kingdom Protista is
A. not considered a valid phylogenetic unit. B. composed of organisms that are very similar to one another. C. only contains single-celled organisms. D. not ecologically important.