In the figure above, which number identifies the cell(s) or portion of the cell(s) that will respond to a
single photon?
a. 1 only
b. 2 only
c. 4 and 7
d. 5 and 8
e. 3 and 6
B
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Eukaryotic-like (possessing a defined nucleus) cells were obtained from a Martian soil sample. The nucleus was carefully isolated and the chromatin obtained. The fibers had a "beads on a string" appearance, suggesting some type of "histones." Following digestion with micrococcal nuclease, protein removal, and gel electrophoresis, DNA fragments were obtained that are multiples of 280 base pairs
in length. Longer incubation with micrococcal nuclease prior to protein removal results in fragments 200 base pairs in length. The amount of DNA that is wrapped around the "core histones" is therefore A) 80 base pairs in length. B) 200 base pairs in length. C) 360 base pairs in length. D) 480 base pairs in length. E) Not enough information is given to determine the answer.
Cytokinesis Role
What will be an ideal response?
What is the main function of DNA helicase in DNA replication?
A) Unzipping the DNA double helix B) Adding complementary DNA bases to the newly forming DNA strand C) Proofreading the DNA molecule D) Fusing DNA fragments together
Which of these results in the production of only one gamete as a result of meiosis?
A. oogenesis B. spermatogenesis C. Both of these are correct. D. Neither of these are correct.