Which of the following describes the distribution of the polar and nonpolar portions of lipids in the lipid bilayer?
A) Both polar heads are on the inside of the bilayer and both hydrophobic tails are on the outside of the bilayer.
B) Both polar heads are on the outside of the bilayer and both hydrophobic tails are on the inside of the bilayer.
C) Both the inside and outside of the bilayer consist of alternating polar heads and nonpolar tails.
D) Some polar heads are on the inside of the bilayer and some are on the outside; the hydrophobic tails are similarly distributed.
B
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The commonest form of the Carbon atom that exists is at times referred to as C12 . An isotope of this atom is called C14 . C14 must have a different number of___________than C12
a. Ions b. Protons c. Atoms d. Neutrons e. Electrons
Pollen morphologies change in response to atmospheric pollution and UVB radiation
a. True b. False
The type of stresses needed to produce a thrust fault can be described by which of the following statements?
a. the maximum principal stresses are vertical b. the maximum principal stresses are horizontal and compressional c. the maximum principal stresses are horizontal and tensional d. none of the above
If the earth were the center of the universe and the moon, planets, and sun all moved around the earth, logic would say that all of these celestial objects should move in the same direction across the sky, and relative to the celestial background
The sun and moon both follow this pattern, but the other planets have periods of retrograde motion. How did the Ptolemaic model explain retrograde motion and how is it more easily explained by the heliocentric model.