Viral cultivation is used for
A. observing the effects of viral infection on host cells.
B. studying the viral life cycle within host cells.
C. diagnosis of viral infections.
D. preparation of vaccines.
E. producing adequate numbers of viruses for research purposes.
F. All of these choices are correct.
Answer: F
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The first colonizers of bare rock are often:
a. angiosperms b. lichens c. mycorrhizae d. sac fungi e. zygote fungi
The brains of patients with Alzheimer’s disease have a reduced level of
1.serotonin. 2.dopamine. 3.acetylcholine. 4.aspartic acid. 5.GABA.
What argument do scientists who support the metabolism-first model use to dispute the replicator-first model?
A) RNA can only be used to make proteins, not other nucleic acids. B) The replicator nucleic acid molecule would be too large and complex. C) Replicators cannot exist without metabolism. D) DNA cannot replicate without the help of proteins.
Xylem ________.
a. is a vessel that carries water in plants b. is a partial division between fungal cells c. is found in nonvascular plants d. makes spores in fungi