Which general genetic process is believed to account for the variety of cellular structures and functions in eukaryotic cells?
A) negative control exclusively
B) variable gene activity
C) intron processing
D) RNA processing
E) maternal environmental activities
B
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Arrange the following three lines of defense from earliest to latest
1 = Adaptive immune system 2 = Physical barriers 3 = Innate immune system
a. 1, 2, 3 b. 2, 1, 3 c. 2, 3, 1 d. 3, 1, 2 e. 3, 2, 1
In temperate-zone lakes, spring and fall _______ cause vertical mixing of waters and trigger a burst of productivity.
Fill in the blank(s) with the appropriate word(s).
Which of the following diseases is NOT caused by endospore-forming bacteria?
A. pneumonia B. botulism C. anthrax D. tetanus E. lockjaw
In female mammals, germ cells are
A. not produced until puberty. B. arrested in meiosis I until puberty. C. fully mature gametes at birth. D. arrested in meiosis II until puberty. E. arrested in mitosis until puberty.