A porpoise and a dolphin, both mammals, mate and produce an embryo, but the embryo fails to complete
development. This event describes:a.
hybrid sterility.
b. hybrid inviability.
c. hybrid breakdown.
d. gametic isolation.
e. gestational abortion.
b
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According to the diversity-stability hypothesis:
A. Genetic diversity is the most important part of ecosystem stability. B. A loss of any species from an ecosystem leads to an approximately equal decline in stability. C. The loss of a few species from an ecosystem does significantly affect ecosystem functioning. D. Losing even a few species from an ecosystem causes a drastic decline in ecosystem stability. E. Every species has an important role in ecosystem function, but we cannot predict the effect of species loss.
All of the following methods are employed to identify pathogens in clinical specimens EXCEPT
A. biochemical tests. B. special stains and microscopy. C. culture on a variety of all-purpose, selective, and/or differential media. D. molecular testing for nucleic acids. E. immunoassays. F. There are no exceptions here. All of these methods are used to identify pathogens.
Which of the following is NOT a form of active transport?
a. sodium-potassium pump b. endocytosis c. exocytosis d. diffusion e. ATP pump
Ruminants are herbivorous reptiles, such as tortoises and iguanas, which regurgitate food to further break it down into smaller pieces
Indicate whether the statement is true or false