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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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.
Of all organisms, prokaryotes are the ____
a. smallest b. least abundant c. least metabolically diverse d. least widespread e. least evolved
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?