Which of the following is the preferred method for cultivating many animal viruses?
a. Growing them in animal cell cultures
b. Growing them on highly enriched agar media
c. Inoculating appropriate laboratory animals
d. Growing them in bacteria
Ans: a. Growing them in animal cell cultures
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A research group claims that they have discovered microscopic fossilized embryos, including some at the blastula stage, but other researchers are skeptical. Finally, one student develops a technique for splitting the embryos in half to reveal the substructure. Cutting open the first blastocyst embryo, the student is very excited. “It is a blastula!" she shouts,"Look, you can see the ____________________ inside!”
A. granulosa cells B. hollow blastocoel C. archenteron D. neural tube Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about a blastula? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A prokaryote that occupies a habitat that is characterized by extreme heat (above 50 degrees Celsius) is a(an):
a. Thermophile b. Acidophile c. Halophile d. Basophile e. Hydrophile
If Na+ channels are opened in a cell that was previously at rest, how will the resting membrane potential be affected?
(a) The membrane potential is not affected by Na+. (b) It becomes more negative. (c) It becomes more positive. (d) It is permanently reset.
Some cyanobacteria are capable of nitrogen fixation, a process that __________.
a. converts N2 to ammonia, making nitrogen available for incorporation into proteins and nucleic acids b. oxidizes nitrogen-containing compounds to produce ATP c. allows these bacteria to live in anaerobic environments d. removes soil nitrogen and returns N2 gas to the atmosphere e. s an essential part of the nitrogen cycle that extracts nitrogen trapped in mineral deposits and makes it available to organisms for their nitrogen metabolism