Biomolecules and the Chemistry of Life
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Biomolecules and the Chemistry of Life: All Buffered Out Quiz
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Q. An atom is the smallest unit of a(n) ___________ and a molecule is the smallest unit of a(n) _____________.
lipid; nucleic acid
Q. Ions form when
atoms are gained or lost from a molecule.
protons are gained or lost from an atom.
electrons are gained or lost from an atom.
neutrons are gained or lost from an atom.
both options 1 and 2 happen.
Q. Hydrogen bonds differ from ionic bonds in that
electrons are shared in ionic bonds but not in hydrogen bonds.
hydrogen bonds form between charged ends of electrically neutral molecules, whereas ionic bonds form between charged particles.
hydrogen bonds only involve hydrogen, and ionic bonds involve other elements.
ionic bonds lead to polar molecules, and hydrogen bonds do not.
hydrogen bonds result in the formation of compounds, but ionic bonds do not.
Q. A food with a pH of 3 is ________ times more __________ than a food with a pH of 8.
Q. Hydrophobic substances do not dissolve in water because
they are repulsed by water.
they have a lower pH than water.
they cause water to break apart into H+ and OH- ions.
they secrete an anti-dissolving substance that prevents water from approaching.
they are nonpolar so water isn’t attracted to them and, therefore, doesn’t pull them apart.
Q. Dehydration synthesis joins monomers into polymers for
all of the above.
Q. Which of the following are sources of diversity in carbohydrates?
The number of carbons in each monosaccharide
The kinds of bonds that hold subunits of polysaccharides together
The kinds of monomers that comprise a polysaccharide
Options 1 and 3 only
Options 1, 2, and 3
Q. The difference between saturated fatty acids and unsaturated fatty acids is that
saturated fatty acids are longer than unsaturated fatty acids.
saturated fatty acids are organic, and unsaturated fatty acids are inorganic.
saturated fatty acids are used for energy storage, and unsaturated fatty acids are hormones.
saturated fatty acids have the maximum number of single bonds, and unsaturated fatty acids have at least one double bond.
saturated fatty acids are found in phospholipids, and unsaturated fatty acids are found in fats, oils, and waxes.
Q. Which of the following statements about amino acids is NOT true?
An amino acid is formed when polypeptide chains fold together.
The identity of the amino acid is determined by the R group.
Amino acids can be polar, nonpolar, or charged.
Amino acids bind to each other by dehydration synthesis.
The properties of amino acids affect the structure and function of proteins.
Q. DNA is called a double helix because
all the bonds between nucleotides are double bonds.
it is a double stranded and coiled molecule.
DNA molecules are twice as long as RNA molecules.
it was discovered by the Helix brothers.
of all of the above.