Vertebrate bone consists primarily of a crystalline mixture of
A. Ca2+; SO4?2.
B. Na+; Cl?.
C. Ca2+; Cl2.
D. Ca2+; PO4?2.
E. Adenosine, PO4?2.
Answer: D
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A large number of cases of a particular disease observed in a relatively short period of time in an area that previously experienced only sporadic cases of the disease is known as a(n)
A) pandemic. B) outbreak. C) endemic. D) zoonosis.
Which of the following statements regarding fern alternation of generations is not correct?
A. Ferns have a dominant, diploid sporophyte. B. The fern gametophyte is very small, but very hardy. C. Most fern gametophytes are capable of producing both male and female gametes. D. Chemical signals released by gametophytes producing eggs cause other, nearby gametophytes to also produce eggs. E. The diploid zygote will grow to become the sporophyte.
What is the significance of the acrosomal and cortical reaction?
What will be an ideal response?
As a result of experimentation on lactose-intolerant individuals, scientists found that ___________.
A. a small change in a DNA nucleotide sequence can have a major effect on the production of lactase B. a mutation within the lactase gene is responsible for lactose intolerance C. males are more likely to be lactose intolerant than females D. the enzyme lactase is not encoded by a DNA gene