In DNA, complementary base pairing occurs between
a. cytosine and uracil.
b. adenine and guanine.
c. adenine and uracil.
d. adenine and thymine.
e. sugar and phosphate.
d
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Postmenopausal women are often advised to take the mineral ________ as a supplement to their diet in order to prevent bone loss due to osteoporosis
Fill in the blank(s) with correct word
In transcription, RNA polymerase binds to a(n) _____________________ sequence near a gene and then assembles a strand of RNA.
Fill in the blank(s) with the appropriate word(s).
What is the fundamental difference between covalent and ionic bonding?
A) In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other. B) In covalent bonding, both partners end up with filled outer electron shells; in ionic bonding, one partner does and the other does not. C) Covalent bonding involves only the outermost electron shell; ionic bonding also involves the next electron shell inside the outermost shell. D) Covalent bonds form between atoms of the same element; ionic bonds form between atoms of different elements.
Many protozoan species can form a ________ that can survive for periods outside a host.
Fill in the blank(s) with the appropriate word(s).