Think you’ve got your head wrapped around Biomolecules and the Chemistry of Life? Put your knowledge to
the test. Good luck — the Stickman is counting on you!
Q. Electrons and neutrons are
repulsed by each other because electrons are negative and neutrons are positive.
attracted to each other because electrons are negative and neutrons are positive.
repulsed by each other because both particles are negative.
neither attracted nor repulsed by each other because both particles are neutral.
neither attracted nor repulsed by each other because although electrons are negative, neutrons are neutral.
Q. Atoms that vary in the number of neutrons they contain are called
isotopes.
ions.
molecules.
radioactive atoms.
polar molecules.
Q. Polarity is the result of
the electric attraction between a negative ion and a positive ion.
the equal sharing of electrons between covalently bonded atoms.
the unequal sharing of electrons between covalently bonded atoms.
the charged end of one molecule being attracted to the oppositely charged end of another molecule.
atoms getting so cold that they reach the temperature of the polar ice caps.
Q. When a water strider stands on the surface of a pond without sinking, he is taking advantage of
the hydrogen bonds between water molecules, which give water high cohesion and surface tension.
the fact that water is really good at dissolving substances.
the buffering properties of water.
water’s very high specific heat, heat of vaporization, and heat of fusion.
the fact that ice floats.
Q. Water can act as a buffer because
water is neutral.
it takes a lot of energy to heat water.
water forms hydrogen bonds.
some of the H2O molecules come apart and release H+ and OH- ions.
of all of the above.
Q. Organic molecules
are grown without the use of pesticides or genetically modified organisms.
contain carbon and hydrogen.
include all molecules that have some carbon.
contain oxygen and hydrogen.
contain carbon and oxygen.
Q. Carbohydrates are useful for all the following purposes EXCEPT
energy storage.
energy transport.
structural support.
catalyzing reactions.
making donuts tasty.
Q. Phospholipids are made of
two fatty acids and a phosphate group bound to a glycerol backbone.
three fatty acids bound to a glycerol backbone.
long chains of saturated carbons.
sugars bound to a phosphate group and a nitrogen-containing base.
four carbons rings fused together.
Q. Which of the following are proteins?
ATP synthase – an enzyme that produces ATP.
Collagen – a structural biomolecule that is found in muscle, bone, skin, and hair.
Actin – one of the main components of muscle fibers that allows movement to occur.
Sodium channels – pore-like molecules embedded in cell membranes that allow sodium ions to flow in and out of a cell.
All of the above
Q. Which of the following traits is NOT shared by DNA and RNA?
They are both nucleic acids.
They are both double-stranded.
They both have the nucleotides adenine, cytosine, and guanine.
They both contain five-carbon sugars.
The sequence of nucleotides is information that is used to make proteins.