Reiji Okazaki discovered what are now called "Okazaki fragments" produced during DNA replication. These
fragments are ____.
a. short lengths of new DNA on the leading strand
b. RNA primers on the lagging strand
c. RNA primers on both the lagging and leading strand
d. short lengths of new DNA on the lagging strand
e. RNA primers on the leading strand
ANSWER: d
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Which of the following substances helps make cells of xylem rigid to avoid collapse?
A. cellulose B. lignin C. chitin D. spongin E. parenchyma
The influenza virus is typical of many animal viruses in that is has an envelope composed of lipids and glycoproteins. Which of the following statements about the envelope is ACCURATE?
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There is an ozone "hole" over:
a. the Northeastern United States b. Western Europe c. Antarctica d. Central America e. North Africa