_____is the ability of an organism to produce toxins
Fill in the blank(s) with the appropriate word(s).
Toxigenicity
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Colonization rates from one habitat patch to another are ____ and extinction rates within habitat
patches are ____ in contiguous habitats than on islands.
a. lower; lower b. lower; higher c. higher; higher d. higher; lower e. even; lower
If new genetic variation in the experimental populations arose solely by spontaneous mutations, then the most effective process for subsequently increasing the prevalence of the beneficial mutations in the population over the course of generations is
_____. A) transduction B) binary fission C) conjugation D) transformation
Describe the events that occur in the clotting of blood by choosing the correct sequence of statements that outlines the process.1. Platelets and injured tissue release prothrombin activator.2. The activated fragments join end-to-end, forming long threads.3. Platelets clump at the sight of puncture and partially seal the leak.4. Fibrin threads wind around the platelet plug in the damaged area and provide a framework for the clot.5. Thrombin, acting as an enzyme, severs two amino acid chains (activated fragments) from each fibrinogen molecule.6. Prothrombin activator converts prothrombin to thrombin.7. Red blood cells are trapped within the fibrin framework forming a clot.
A. Sequence: 1, 2, 6, 7, 4, 3, 5 B. Sequence: 3, 1, 6, 5, 2, 4, 7 C. Sequence: 4, 5, 6, 7, 3, 2, 1 D. Sequence: 7, 4, 5, 2, 3, 1, 6
The study of evolutionary biology has influenced the techniques used by the health and livestock industries in which of the following ways?
a. Physicians often prescribe antibiotics in combination. b. Livestock producers have entirely cut back on their inclusion of antibiotics in feed. c. Pharmaceutical companies now recommend that physicians prescribe the highest safely toler-ated doses of new antibiotics. d. A and C. e. All of the above.