chp 3(3)
DNA and mRNA differ with respect to ...
(a) the kind of sugar they contain.
The information in DNA tells a cell how to make ... proteins. (b) DNA. (c) tRNA. Both (a) and (b). (a), (b), and (c).
(a), (b), and (c).
a) Disulfide bridges bind the proteins together. (b) Each protein is a single long alpha helix. (c) Hair is another example. Both (a) and (b). (a), (b), and (c)
(a), (b), and (c).
Which statement is true of nucleic acids?
(d) DNA carries information for making RNA.
If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain?
75
Which of the following is NOT true of protein quaternary structure?
A single polypeptide may have quaternary structure.
The helical foldings of proteins are stabilized mainly by bonds between ...
CO and NH.
Which statement helps to explain how DNA stores hereditary information?
DNA contains four kinds of nitrogenous bases.
Which of the following statements best summarizes the differences between DNA and RNA?
DNA nucleotides contain a different sugar than RNA nucleotides.
Which of the following best summarizes the relationship between dehydration reactions and hydrolysis?
Dehydration reactions assemble polymers, and hydrolysis reactions break down polymers.
How likely is it that the next base, out of sight at the top of this polymer, is uracil?
Not a chance, since this is a DNA molecule, not an RNA molecule.
What will probably be the effect on a protein if you replace the amino acid proline with the amino acid glycine (side chain -H) at several points?
The altered protein will have longer helices than before.
Which of the following is true of both starch and cellulose?
They are both polymers of glucose.
Which of the following statements concerning unsaturated fats is true?
They are more common in plants than in animals.
Which of the following is true of pleated sheet foldings within a polypeptide?
They depend on regular occurrence of CO and NH.
Which of the following descriptions best fits the class of molecules known as nucleotides?
a nitrogenous base, a phosphate group, and a pentose sugar
The helical foldings in proteins ...
are kept folded by hydrogen bonds.
What is the chemical reaction mechanism by which cells make polymers from monomers?
dehydration reactions
One of the primary functions of RNA molecules is to
function in the synthesis of proteins.
The two strands of a DNA double helix are held together by _____ that form between pairs of nitrogenous bases.
hydrogen bonds
RNA nucleotides contain __________ than DNA nucleotides.
more oxygen
A nucleotide is composed of a(n) _____.
phosphate group, a nitrogen-containing base, and a five-carbon sugar
The structural level of a protein least affected by a disruption in hydrogen bonding is the ________
primary level.
The four main categories of large biological molecules present in living systems are _____.
proteins, nucleic acids, polysaccharides, and lipids
are kept folded by hydrogen bonds.
secondary
Which functional group is not present in this molecule?
sulfhydryl
The bonding of two amino acid molecules to form a larger molecule requires
the release of a water molecule.
The tertiary structure of a protein is the
unique three-dimensional shape of the fully folded polypeptide.
A dehydration reaction (or condensation reaction) is the process in which _____.
water molecules are produced as a polymer is formed from monomers
