Which of the following is a waste product of photosynthesis?
a. carbon dioxide
b. oxygen
c. sugar
d. water
B
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As glaciers in North America melted, formerly glaciated areas were invaded by
A) ice. B) tundralike vegetation. C) boreal forest, dominated by spruce and jack pine. D) various species of trees, including spruce, white pine, oaks, and maples.
A case study. Epidemiologists were working on tracing an infectious disease outbreak. They traced all of the cases back to a specific movie theater, at a specific time, where the index patient saw a movie. Very few of the 34 cases that became infected at the theater ate or drank while watching the movie with the index patient. What do you suppose was the mode of transmission for this infectious disease?
A) Inhalation B) Ingestion C) Direct body contact
How is the development of autoimmunity normally prevented?
A) T lymphocytes that respond to autoantigens in the thymus undergo clonal deletion. B) T lymphocytes require a specific set of cytokine signals to become activated. C) Regulatory T cells suppress autoimmune responses. D) Clonal deletion of T cells and regulatory T cell suppression prevent autoreactive T cell activation. E) Clonal deletion of T cells, lack of necessary cytokine signals, and regulatory T cell suppression prevent activation of autoreactive T cells.
Seth purchased five pounds of live crayfish and realized that the outer shells were made of a tough carbohydrate similar to that used to make the carapace of a cockroach. What do you think the outer shells of the crawfish are made of?
A. Glycogen B. Chitin C. Amylopectin D. Cellulose E. Fibrin