Which of the following is true of proteins?
A) All proteins are acidic.
B) All proteins are basic.
C) All proteins are neutral.
D) The acid/base properties of a protein depend on the identity of its side chains.
D
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When a star collapses to become a black hole, its mass
A. decreases. B. increases. C. remains unchanged.
The attachment of a water molecule to other water molecules within the xylem of a plant is called ________ and occurs due to ________
A) cohesion; tension B) adhesion; transpiration C) cohesion; hydrogen bonds D) adhesion; diffusion
Your friend shows you a purple-colored mineral sample he recently found while walking the beach. He claims that it must be quartz, because the color matches that of another quartz sample he saw in a museum. Do you think his identification is accurate?
A. Yes; the mineral quartz is almost always the color purple. B. Maybe; further tests must be done to positively identify the mineral, since quartz can come in many different colors. C. No; the mineral quartz is never purple.
The concept that the earth was a sphere was not known until the Renaissance, in Columbus's time
Indicate whether the statement is true or false