Helicase
A) causes a bubble of single-stranded DNA to form.
B) unwinds the DNA.
C) creates the replication fork.
D) allows for DNA polymerase III to bind to the DNA.
E) relieves coiling tension that develops as the helix is unwound.
Answer: B
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In conifers, the megasporocyte undergoes meiosis to produce four daughter cells. How many of these survive to develop into gametophyte(s)?
a. two b. three c. one d. four
Arthropods with mandibles, a single pair of antennae, and two legs on most body segments are:A
ribbon worms. B. centipedes. C. millipedes. D. trilobites. E. mites.
A thylakoid that is placed in a basic solution will synthesize ATP. How is this possible?
A. ATP cannot be broken down at low pH. B. ATP is formed spontaneously at low pH. C. A proton gradient is created by the difference in pH. D. An electron gradient is created by the difference in pH. E. The carbon reactions are blocked in the thylakoid at high pH.
Which of the following occurs in prophase??
a. sister chromatids attach
b. DNA replicates
c. chromosomes align in the middle of the cell
d. the nuclear envelope breaks down
e. sister chromatids separate