What is the effect of TSST-1 exotoxin on the body?
A) It causes red blood cell lysis.
B) It damages the endothelial cells of capillaries.
C) It binds to receptors on T cells and activates them.
D) It is a pyrogen, causing fever.
E) It kills epithelial cells of mucous membranes.
C
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Sexual selection affects male characteristics more than female characteristics. Sexual selection operates by which of the following methods?
A. Intrasexual selection, where one sex directly competes with each other for the opportunity to mate with the opposite sex. B. Intersexual selection, where females select mate on the bases of their physical attributes. C. intersexual selection, cryptic female choice. D. Intrasexual selection where one sex directly competes with each other for mates and intersexual selection where females select their mate because of physical attributes and through cryptic female choice. E. Predatory sexual selection, where females only choose mates that can avoid predators.
Based on the endosymbiosis theory that highlights where chloroplasts come from, how would you expect chloroplasts to divide when a plant cell divides?
A. Via mitosis B. Via meiosis C. Via endosymbiosis D. Via binary fission
Contemporary hypotheses concerned with the origin
of life focus on what two characteristics of living systems? a. energy conversion and biosynthesis b. self-replication and energy conversion c. plasma membranes and self-replication d. growth and development e. adaptation and responsiveness
A positive tuberculin skin test is an example of
A) delayed cell-mediated immunity. B) autoimmunity. C) acute contact dermatitis. D) psoriasis. E) innate immunity.