Mutations can be good, bad or result in no change depending on:
a) The type of change.
b) Where the change in DNA occurs.
c) If the change is detected and fixed before replication.
d) How it affects the organism and its survival.
e) all of the above
Ans: e) all of the above
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Which of the following best explains why "carbs" (carbohydrates) are advertised by manufacturers of candy bars and sports drinks as a "quick energy boost"?
A) The energy in them can be stored as fat, which has high energy per unit weight. B) The carbons in carbohydrates are rich in energy because they are highly oxidized. C) Carbohydrates are reduced molecules that have high-energy electrons. D) This is an advertising gimmick that has no scientific evidence to support it.
Which components are required in plasmids? (check all that apply)
_____ A selectable marker, usually antibiotic resistance _____ A bacterial artificial chromosome _____ One or more unique restriction sites where foreign DNA can be added _____ An origin of replication to allow it to replicate in E. coli independently of the host chromosome
At what temperature are most household freezers kept?
A) 4 °C B) 0 °C C) -20 °C D) -80 °C
The movement of chemicals through ecosystems is known as
A. gross primary production. B. biogeochemical cycling. C. community ecology. D. net primary production. E. biomagnification.