Which isolating mechanism is postzygotic?
A. Hybrid sterility
B. Mechanical isolation
C. Temporal isolation
D. Ecological isolation
E. Behavioral isolation
Answer: A
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With injury, illness, anxiety, or starvation
a. cortisol levels in the blood increase dramatically. b. the adrenal medulla releases norepinephrine and epinephrine. c. the respiratory rate increases. d. the fight or flight response is activated. e. all of these occur
Some protobionts have been shown to have the ALL of following features except
a. divide by binary fission. b. maintain a chemical environment different from their external environment. c. metabolize certain compounds. d. grow in size. e. disorganization
Which is the correct sequence of structures through which the filtrate would pass?
1) Bowman's capsule 2) collecting duct 3) distal convoluted tubule 4) proximal convoluted tubule 5) ascending loop of Henle 6) descending loop of Henle a. 1 ? 3 ? 4 ? 5 ? 6 ? 2 b. 1 ? 4 ? 5 ? 6 ? 3 ? 2 c. 1 ? 6 ? 5 ? 4 ? 3 ? 2 d. 1 ? 3 ? 4 ? 2 ? 6 ? 5 e. 1 ? 4 ? 6 ? 5 ? 3 ? 2
Why are nearly all AIDS patients at risk of developing Pneumocystis pneumonia?
A) Pneumocystis jiroveci is becoming a wide-spread contaminant in health care environments. B) Pneumocystis jiroveci is commonly found in a wide variety of soils. C) The pathogen is easily transmitted from infected persons to others. D) Pneumocystis jiroveci is a common member of the respiratory microbiome in humans and opportunistic pathogen. E) Pneumocystis jiroveci is zoonotic in a wide range of vertebrates and exposure is unavoidable.