Which is the first distinctively hominin trait to appear in the fossil record?
A) sophisticated stone tools
B) increased brain size
C) upright walking (bipedalism)
Answer: C
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Of all organisms, prokaryotes are the ____
a. smallest b. least abundant c. least metabolically diverse d. least widespread e. least evolved
Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. The solution inside with respect to outside the cell is
A. hypotonic. B. turgid. C. isotonic. D. saturated. E. hypertonic.
Phenotypically, a female (XX) mouse embryo that was transformed with a small piece of a Y chromosome bearing the SRY gene would develop as
A) a male. B) a female. C) an intersex individual. D) a male initially, then revert to female after birth. E) a female initially, then revert to male after birth.
Otitis media is a bacterial infection of the (ear/pharynx/sinuses)
What will be an ideal response?