The genes that play a role in the biological clock form part of gene storing structures in the
nucleus known as
a. nucleotides.
b. chromosomes.
c. tissues.
d. proteins
B
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Low-growing, hardy plants of the __________ occur at high latitudes, where there is a layer of
__________. At high altitudes, similar plants grow as __________. Fill in the blank(s) with the appropriate word(s).
Viruses that infect bacteria are:
a. Not known to exist b. Prions c. Bacteriophages d. Composed of protein only e. Also capable of causing disease in humans
A given chromosome and its genes may end up in any of ____ gametes
a. 2 b. 4 c. 6 d. 8 e. 10
Which conclusion can best be drawn from this study?
A) Women of age 20 or younger never have a child with Down syndrome. B) Women in this study who were 45 years old had three times the incidence of babies with Down syndrome as did 40-year-old women. C) Many babies with Down syndrome die before birth. D) For 40-year-old women around the world, ten births per thousand have Down syndrome.