Prezygotic reproductive isolation occurs ____
a. just after the union of the egg and sperm nuclei
b. during embryo development
c. during fetal development
d. after birth
e. before the mating pair comes into contact
ANSWER: e
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____ is the first stage of aerobic respiration and fermentation.
A. Anaerobic B. Substrate-level phosphorylation C. Glycolysis D. Cellular respiration E. Pyruvate
Antigen-antibody complexes trapped in tissues and triggering complement activation or mast cell degranulation are characteristic of
A) type I hypersensitivity. B) type II hypersensitivity. C) type III hypersensitivity. D) autoimmunity. E) graft rejection.
What do tabun, sarin, soman, and V agent all have in common?
A) They all enter the body through the respiratory tract. B) The onset of symptoms following exposure is immediate. C) They are all colorless and odorless chemical nerve agents. D) They all possess the same level of volatility and persistence.
Intermediate filaments help protect animal cells from mechanical stress because ____________
(a) filaments directly extend from the interior of the cell to the extracellular space and into the next cell, linking one cell to the next, helping to distribute locally applied forces. (b) filaments in each cell are indirectly connected to the filaments of a neighboring cell through the desmosome, creating a continuous mechanical link between cells. (c) filaments remain independent of other cytoskeletal elements and keep the mechanical stress away from other cellular components. (d) filaments make up the desmosome junctions that connect cells; these junctions are more important than the internal network of filaments for protecting cells against mechanical stress.