Complement proteins can form a system of proteins that create a pore in the membranes of bacteria
This system is called the _________________. Fill in the blank(s) with the appropriate word(s).
ANS: membrane-attack complex (MAC)
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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
An oak tree can support hundreds of beetles, caterpillars and other primary consumers. This is an example of
A. a pyramid of biomass. B. excessive levels of primary production. C. an unusually diverse group of primary consumers. D. primary parasitism. E. an inverted pyramid.
The cell junctions labeled "A" in the figure
a. prevent movement of materials between cells. b. are found in tissues subjected to stretching. c. allow the free passage of materials between cells. d. are found mostly in heart muscle. e. are found in most tissues except in the stomach.
At rest, the partial pressure of oxygen (PO2) is most veins is approx. 40 mm Hg. At this PO2, approx. ______ of hemoglobin molecules are associated with oxygen.
A. 25% B. 40% C. 50% D. 75%