Mature fungal spores are ____
a. always haploid
b. always diploid
c. always dikaryotic
d. either diploid or dikaryotic
e. either haploid or diploid
ANSWER: a
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All cells in an individual organism contain the exact same DNA, but they can perform
different functions.
a. False, different cells have different functions and thus different genes. b. True, each cell only activates specific portions of its DNA. c. False, cells divide repeatedly and DNA changes occur during this time. d. True, all cells are inherited from a single parent.
According to scientists, about what percentage of men currently living in Central Asia may be descended from the Mongolian ruler Genghis Khan?
A) 4% B) 8% C) 25% D) 40%
During muscle contractions, ____
a. the sarcomeres lengthen b. the actin and myosin filaments slide in the same direction c. the actin filaments move toward the middle of the sarcomere d. the muscle fibers elongate e. the muscle fibers are motionless
Bacteria protect their own DNA from restriction enzyme damage by adding ________ groups to certain nucleotides
A) methyl B) hydroxyl C) phosphate D) amino E) carboxyl