Which are responsible for the humoral immune response?
A. neutrophils
B. macrophages
C. T cells
D. B cells
E. helper cells
Answer: D. B cells
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Anthers produce
a. ovules. b. seeds. c. megaspores. d. nectar. e. none of these.
Chronically high blood pressure is called
a. ventricular fibrillation. b. hypertension. c. leukemia. d. sickle-cell anemia. e. a stroke.
Which of the following sequences correctly lists the hierarchical nature of cellular structures, from smallest to largest?
A) organic molecules, supramolecular structures, macromolecules, organelles, cells B) organelles, organic molecules, supramolecular structures, macromolecules, cells C) organic molecules, macromolecules, organelles, supramolecular structures, cells D) organic molecules, macromolecules, supramolecular structures, organelles, cells E) macromolecules, organic molecules, supramolecular structures, organelles, cells
Parthenogenesis is a method of reproduction in which
a) an egg develops without being fertilized by a sperm b) the parent animal divides into two new animals c) an egg develops after being fertilized by a sperm d) the offspring develops as an outgrowth of the parent's body wall