During replication, which enzyme unwinds the two strands of the DNA molecule from one another?
A. Primases
B. Helicases
C. Unwindases
D. Ligases
Answer: B
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Which of the following is the best measure of an organism's fitness?
a) its size, compared with other members of the same species b) the number of fertile offspring it produces c) how long it lives d) the number of mutations it acquires during its lifetime e) the amount of care it receives from its parents
Strictly speaking, mitosis and meiosis are divisions of the
A) cytoplasm. B) nucleus. C) nucleus and chromosomes. D) chromosomes. E) nucleus, cytoplasm, and chromosomes.
Hepatitis B virus
A. is transmitted to newborns from chronic carrier mothers. B. has many chronic carriers. C. is principally transmitted by blood. D. transmission risks include shared needles, anal intercourse, and heterosexual intercourse. E. All of the choices are correct.
The skeleton does NOT ________.
a) provide protection for internal organs b) move food and blood in the body c) produce blood cells d) support the weight of the body