Insects have compound eyes that are highly sensitive to _______________.
Fill in the blank(s) with the appropriate word(s).
movement
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The function of the phloem companion cells is to
a. assist vessel members to move organic substances. b. supply potassium ions for water absorption. c. help load organic compounds into neighboring sieve tubes. d. store the organic compounds transported by the sieve tubes. e. help transport organic compounds when the sieve tubes become overloaded.
In DNA and RNA, the polymers are polynucleotides and the monomers are _____________.
Fill in the blank(s) with the appropriate word(s).
Any molecule that serves as an electron acceptor will be __________.
(A) reduced (B) oxidized (C) phosphorylated (D) catabolized
Which hormone, when present in a human female's urine, indicates a pregnancy?
a. estrogen b. luteinizing hormone c. human chorionic gonadotropin d. progesterone