Which of these is an example of maintaining a constant internal environment?

A. sweating in the sun
B. running from a dog
C. eating a sandwich
D. laughing at a joke
E. bleeding from a cut


Answer: A. sweating in the sun

Biology & Microbiology

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Which of the following is a source of carbon skeletons that are used in the synthesis of amino acids?

A. Acetyl-CoA B. Glycolysis intermediates C. TCA cycle intermediates D. All of the choices are correct.

Biology & Microbiology

Anions are _____ charged ions and cations are _____ charged ions

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Arthropods were the first terrestrial animals because their exoskeletons allowed them to withstand

A) the force of gravity. B) ultraviolet radiation. C) starvation. D) high oxygen concentrations. E) lower atmospheric pressure.

Biology & Microbiology

Aerobic bacteria in the genus ________ are metabolically diverse soil-dwellers which also cause opportunistic disease in cystic fibrosis patients.

A. Burkholderia B. Coxiella  C. Enterobacter D. Prevotella E. Hafnia

Biology & Microbiology