A(n) __________ is a hybrid, with two nonidentical alleles (Aa). Fill in the blank(s) with the appropriate word(s)
ANSWER: heterozygote
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Why does DNA synthesis only proceed in the 5? to 3? direction?
a. Because DNA polymerases can only add nucleotides to the 3? end of a polynucleotide strand. b. Because the 3? end of the polynucleotide molecule is more electronegative than the 5? end. c. Because that is the direction in which the two strands of DNA unzip. d. Because that is the only direction that the polymerase can be oriented. e. Because the chromosomes are always aligned in the 5? to 3? direction in the nucleus.
Based on the accompanying figure, which label describes diploid cells?
a. 2
b. 3
c. 4
d. 5
e. 6
Superoxide dismutase protects cells from damage caused by ________.
A) ?O2- B) O32- C) H2O2 D) H3O+
Which of the following is not an example of a connective tissue?
(a) bone (b) the layer of photoreceptors in the eye (c) the jellylike interior of an eye (d) cartilage