The cellular fragments in the blood that function in blood clotting are
(a) erythrocytes.
(b) leukocytes.
(c) platelets.
(d) none of the above.
(c) platelets.
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The question(s) below are included here for courses that are structured to include written exercises. This may also serve as an exercise for a recitation or discussion section where students work alone or in groups on more difficult conceptual problems
Core Concept 21.6 is also covered in other suites for the chapter, so these questions can be left out if they are not appropriate for your course. What are the fates of new mutations in DNA sequence? What forces are primarily responsible for determining the fate of a new mutation? What will be an ideal response?
Which group of plants emerged first?
A) angiosperms B) gymnosperms C) pteridophytes D) conifers
Delayed-type hypersensitivity skin tests are used to screen for:
A. humoral immunodeficiencies. B. cell-mediated immunodeficiencies. C. phagocyte immunodeficiencies. D. complement deficiencies.
To reduce one molecule of O2, ________ electron(s) must be passed through the electron transport chain and ________ molecule(s) of NADH is(are) oxidized.
A) 4; 2 B) 2; 1 C) 1; 1 D) 1; 2 E) 4; 4