Some proteins are important biological buffers because:a
they react with water to produce carbon dioxide, which neutralizes acids.
b. they contain acidic as well as basic groups.
c. they are able to absorb great amounts of carbon dioxide during condensation reactions.
d. they produce carbonic acid upon hydrolysis.
e. they contain nonpolar groups that exclude water molecules
B
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Would ID50 and LD50 necessarily be the same for a given virus? Why or why not?
A. Yes, because the number of viruses that infect 50% of a test population should also kill 50% of that test population. B. No, because a virus may be highly infectious (very low ID50 value) but only marginally lethal (very high LD50 value). A prime example of this is the rhinovirus (common cold virus). C. No, because very few viruses are lethal, yet many are highly infectious. The two values should ALWAYS be different. D. Yes, because what we're actually describing here is infection/killing of individual CELLS, not of entire organisms. If a cell is infected, it will always be killed.
Changing day length, as well as variations in precipitation and temperature, are environmental cues
that exert an important influence on: a. the kinds of genes a plant has. b. the number of mutations that genes undergo. c. whether a plant is an annual, biennial, or perennial. d. which genes will be expressed in a plant. e. whether a plant reproduces sexually or asexually.
The descriptive groupings of virus into categories such as icosahedral and helical are based on
A. the presence or absence of an envelope. B. the type of nucleic acid. C. the shape of the nucleocapsid. D. the mechanism of entry into host cells.
At the end of the Gram stain, gram-positive bacteria will be seen as purple cells.
Answer the following statement true (T) or false (F)