The acidic pH inside the lysosomes is maintained by
A. a proton [H+] pump
B. simple diffusion
C. a Na+ pump
D. facilitated diffusion
E. an antiport
Answer: A. a proton [H+] pump
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Skin is very tough but extremely sensitive. Explain how some structures in the skin allow it to withstand a vigorous pinch and tug, while other structures allow it to detect the presence of a mosquito on your arm
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The left lung contains some features the right lung does not. Which of the following are only found in the left lung?
A) cardiac notch B) cardiac impression and root C) cardiac impression D) root E) cardiac impression and notch
Structures that carry tears from the eyes to the nasal cavity are called
A. nasolacrimal ducts. B. internal nares. C. paranasal sinuses. D. auditory tubes. E. nasal septa.
Each of the following is true concerning mitochondria except
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