DNA polymerase cannot start a new DNA strand
a. true
b. false
Ans: a. true
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The base sequences that appear in eukaryotic DNA and are used to make mRNA for a specific protein are the _____ of a gene.
Fill in the blank(s) with the appropriate word(s).
In sickle cell anemia, glutamic acid is
substituted for
a. valine b. lysine c. serine d. arginine e. phenylalanine
Embryonic plants are nourished by nutrients in endosperm, cotyledons, and fruits
Touching a jellyfish can be a very painful experience whereas touching a comb jelly is not painful. Why is there a difference?
A. Ctenophores only use nematocycts for feeding, not for defense. B. Ctenphores do not possess nematocysts. C. Nematocysts in ctenophores lack venom. D. Ctenophores have very reduced nematocysts that cannot penetrate human skin.