Another technique that could be used to demonstrate the organisms shown in Image B is the:
a) Brown and Hopps
b) Gridley
c) Ziehl-Neelsen
d) Dieterle
Answer: c) Ziehl-Neelsen
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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.
One of the science-related concerns associated with the use of genetically modified (GM) foods is that
A) overreliance on GM crops may lead to genetic uniformity. B) GM foods are not natural. C) genetic modification degrades the nutritional value of food crops. D) buffer zones of GM crops halt the pollination of non-GM crops.
Certain cell types in humans, such as skeletal muscle cells, have several nuclei per cell. Based on your
understanding of mitosis, how could this happen?
a. The cell undergoes repeated cytokinesis but not mitosis. b. The cell undergoes repeated mitosis with concomitant cytokinesis. c. The cell undergoes repeated mitosis but not cytokinesis. d. The cell undergoes anaphase twice before entering telophase. e. The cell goes through multiple S phases before entering mitosis.
The optimum temperature for coral formation occurs where the average annual temperatures are between ____ ?C and ____ ?C
a. 18, 20 b. 20, 23 c. 23, 25 d. 25, 27 e. 30, 40