The major structural component of bacterial cell walls is ____
a. cellulose
b. chitin
c. proteoglycan
d. peptidoglycan
e. arabinogalactan
ANSWER: d
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Outside a host cell a virus is called a(n):
a. capsid. b. virion. c. nucleocapsid. d. envelope. e. glochidia.
Bees C and D differ from bees E and F because ____
a. bees C and D had a different father than bees E and F b. bees C and D had a different mother than bees E and F c. bees C and D inherited different alleles than bees E and F from their mother d. bees C and D inherited different alleles than bees E and F from their father e. bees C and D are haploid drones while bees E and F are diploid female workers
For a span of 248 mya to 65 mya, the Mesozoic era, in which dinosaurs appeared, dominated, and became extinct, lasted approximately ___ of the geologic timescale.
A. 4% B. 50% C. 7% D. 20% E. 15%
Recombinant DNA technologies are most often used for
A) creating billions of copies of a target gene in a few hours. B) genetic screening of newborns for inherited diseases. C) measuring expression levels of a gene in a particular cell. D) producing large amounts of a particular protein quickly and easily. E) creating billions of copies of a target gene in a few hours, measuring expression levels of a gene in a particular cell, producing large amounts of a particular protein quickly and easily, and genetic screening of newborns for inherited diseases.