What kind of organisms likely perished due to the increase of oxygen in the atmosphere three billion years ago?
a. heterotrophs
b. cyanobacteria
c. obligate aerobes
d. obligate anaerobes
e. facultative anaerobes
d
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When are the oocytes formed in a human female?
a. When she is pre-adolescent b. Each month as part of the menstrual cycle c. During puberty d. During her own embryonic development
Coenzymes such as NAD+ and NADP+
a. are tightly bound to enzymes. b. are associated with metal ions. c. diffuse freely through the cytoplasm. d. are not modified in reactions. e. all of these.
Bacillus thuringiensis israeliensis (Bti) produces a protein that causes the destruction of the lining of the gut of insects that eat it and is therefore
A. a natural insecticide. B. a GM organism. C. the result of somatic cell transfer. D. all the above are true.
Which of the following statements about puerperal sepsis is FALSE?
A) It is transmitted from mother to fetus. B) It is caused by health care personnel. C) It begins as a focal infection. D) It is a complication of abortion or childbirth. E) Its frequency of occurrence has decreased because of antibiotics and aseptic techniques.