Hummingbirds are
a. heterotherms.
b. endotherms.
c. ectotherms.
d. ectotherms during the day and endotherms at
night.
e. none of these.
Answer: a
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When added to water at neutral pH (7.0), an acid will ____
a. act as a proton donor, raising the pH of the solution b. act as a proton acceptor, raising the pH of the solution c. act as a proton donor, lowering the pH of the solution d. act as a proton acceptor, lowering the pH of the solution e. do nothing since the aqueous solution is neutral
The above organism is responsible for fish
kills and belongs to which of the following groups? a. chrysophytes b. dinoflagellates c. flagellated protozoans d. ciliates e. oomycotes
The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added because lactose binds to the _______ and inactivates it.
A: low; high; lac operator B: high; low; lac operator C: low; high; lac promoter D: low; high; lac repressor E: high; low; lac inducer
Emerging viruses arise by
a) the spread of existing viruses more widely within their host species. b) mutation of existing viruses. c) the spread of existing viruses to new host species. d) all of the above e) none of the above