Freshwater fish are in a hypotonic environment. What keeps the cells in their body from lysing?
A. Freshwater fish have chloride channels
that actively move chloride out of the gills into
the surrounding water, allowing water to
move into the gills.
B. Freshwater fish have chloride channels
that actively move chloride out of the gills into
the surrounding water, allowing water to
move out of the gills.
C. Freshwater fish have chloride channels
that actively move chloride into the gills,
allowing water to move into the gills.
D. Freshwater fish have chloride channels
that actively move chloride into the gills,
allowing water to move out of the gills.
C
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Identify the correct sequence of events that occur during the reproduction of HIV.
A. virus attaches to a host cell - the virus enters the cell - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - viral / host DNA is turned into a viral mRNA code - the viral RNA forms into a mature virus - mature viruses leave the host cell B. virus attaches to a host cell - the virus enters the cell - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - the viral RNA forms into a mature virus - viral / host DNA is turned into a viral mRNA code - mature viruses leave the host cell C. virus attaches to a host cell - the virus enters the cell - reverse transcriptase occurs - viral DNA is incorporated into the host DNA - viral / host DNA is turned into a viral mRNA code - the viral RNA forms into a mature virus - mature viruses leave the host cell D. virus attaches to a host cell - the virus enters the cell - viral / host DNA is turned into a viral mRNA code - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - the viral RNA forms into a mature virus - mature viruses leave the host cell
The process of _______________________ leads to organisms that are ___________________________ that environment.
Fill in the blank(s) with the appropriate word(s).
The loss of which species on the figure above represents the loss of the most significant phylogenetic diver-sity?
a. A b. B c. C d. D e. D and E
Antibody response that occurs upon the first exposure to an antigen
A. Primary Response B. IgM C. Secondary Response D. IgG E. Latent Period F. 1st Exposure G. 2nd Exposure