A molecule takes 3.0 seconds to diffuse across a membrane. If the thickness of the membrane is doubled, then how long does it take the molecule to diffuse across the thicker membrane?
A. 30 hours
B. 24 hours
C. 20 hours
D. 18 hours
E. 12 hours
E. 12 hours
Physics & Space Science
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The basic molecular building blocks of DNA and RNA are
A) nucleotides B) adenosine triphosphate molecules C) amino acids D) monosaccharides
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During heating, an amorphous material starts to soften at the ______________transition temperature.
Fill in the blank(s) with the appropriate word(s).
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The orbits of the electrons in the hydrogen atom
are a)evenly spaced. b)characterized by a principal quantum number. c)always smaller than that of the ground state. d)all at the same energy level within a given atom.
Physics & Space Science
The figure above shows the geological time scale of Earth. Life has existed for ________ of the Earth's history.
A) all B) about 90% C) about 50% D) about 25%
Physics & Space Science