Toxicants occurring in aquatic ecosystems are highly subjected to biological magnification, meaning the
A) pollutants take a long time to break down.
B) pollutants occur in higher concentrations in tissues of organisms higher up the food chain.
C) toxic chemicals specifically target primary producers, disrupting the entire food web.
D) chemicals are converted to more toxic compounds once in the water.
E) toxic chemicals accumulate in the upper (photic) zones of the water.
B
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ATP is hydrolyzed by actin
a. in the process of assembly into a filament. b. after assembly but before disassembly. c. in the process of disassociation. d. after disassociation from the filament. e. None of the above
What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized?
A. DNA polymerase can join new nucleotides only to the 3?3? end of a preexisting strand, and the strands are antiparallel. B. The origins of replication occur only at the 5?5? end. C. DNA ligase works only in the 3?3? ?? 5?5? direction. D. Helicases and single-strand binding proteins work at the 5?5? end.
List the types of chromosomal mutations.
What will be an ideal response?
Answer the following questions true (T) or false (F)
1. Microbial contamination always results in infection. 2. Influenza is an example of a chronic disease. 3. Biofilms provide an alternative means for bacteria to attach to surfaces within the body.