If the syringe contains live R strain Streptococcus
pneumoniae
a. the mouse will die.
b. live S strain will be detected in the mouse’s
blood.
c. the mouse will live.
d. no live R strain will be detected in the mouse’s
blood.
e. the live R strain bacteria will develop
pathogenicity.
Answer: c
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All cells in an embryo have the same genes, but they express different subsets of this genome. Selective gene expression is the basis of:
a. cleavage b. cell differentiation c. fertilization d. gamete formation e. organ maturation
A human X-linked recessive gene may be
a. found on the Y chromosome. b. passed to daughters from their fathers. c. passed to sons from their mothers. d. expressed more commonly among females. e. both passed to daughters from their fathers and passed to sons from their mothers.
Which of the following is an example of an herbivore?
a. an earthworm b. a sheep c. a human d. a pig e. a fish
The total amount of energy fixed by photosynthetic organisms minus the energy used in their own metabolic activities is
A. net secondary productivity. B. primary productivity. C. secondary productivity. D. net primary productivity.