Which of the following statements about nosocomial infections is not true?
A) They occur in compromised patients.
B) They are caused by opportunists.
C) They are caused by drug-resistant bacteria.
D) They are caused by normal microbiota.
E) None of the above.
Ans: B) They are caused by opportunists.
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During gastrulation in sea urchins, invagination produces a cavity called the ____
a. archenteron b. primary mesenchyme c. secondary mesenchyme d. blastocoel e. blastocyst
Which of the following is not a symptom of
premenstrual syndrome? a. tender breasts. b. headaches. c. water retention. d. irritability. e. all of these
Old World monkeys have a prehensile tail and a flattened nose.
Answer the following statement true (T) or false (F)
Evolution is sometimes described as the change from preexisting life-forms to modern-day organisms. What actually changes, in every case of evolution, is the
A) ability of organisms to respond to external stimuli. B) energy and nutritional demands of the organism. C) species' physical appearance. D) rate of reproduction. E) genetic makeup of the species, due to mutations.