The plasma membranes of some plant cells use transport proteins to move protons out of the cell against their concentration gradient (from areas of low proton concentration to areas of high proton concentration). This is an example of:
a) simple diffusion
b) active transport.
c) endocytosis.
d) facilitated diffusion.
e) passive transport
Ans: b) active transport.
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Suppose a sample of five econometrics students' heights were: 69 inches, 73 inches, 65 inches, 67 inches, and 71 inches. What is the sample mean of the height of the students?
A. 69 inches B. 71 inches C. 68.5 inches D. 68 inches