The bond dissociation energy for a van der Waals interaction is approximately ________. - answer-2 kJ/mol
The molecule cyclohexane (C6H12) is designated as _____ relative to water. - answer-hydrophobic
If the proton concentration in an aqueous (H2O) solution is increased by 100x, what happens...
BIOCHEM QUESTION BANK !!!
The bond dissociation energy for a van der Waals interaction is approximately ________. -
answer-2 kJ/mol
The molecule cyclohexane (C6H12) is designated as _____ relative to water. - answer-
hydrophobic
If the proton concentration in an aqueous (H2O) solution is increased by 100x, what happens to
the pH of the solution? - answer-It goes down by 2 units.
The pKa for carbonic acid is 3.77. If a solution containing carbonic acid is found to have a pH of
4.77, what is the ratio of bicarbonate/carbonic acid? - answer-10
A covalent bond distance is approximately __________. - answer-1.5 A
Water is polar because _______. - answer-It has a bent molecular structure.
It has a tetrahedral electronic structure.
The O-H bond is polar.
If the proton concentration in an aqueous (H2O) solution is increased by 10x, what happens to
the pH of the solution? - answer-It goes down by 1 unit.
What would be the net charge on the tripeptide Asp-Gly-Phe at pH 7.0? - answer--1
Why is the peptide bond planar? - answer-It exhibits partial double-bond character, preventing
rotation.
Roughly how many amino acids are there in one turn of an α helix? - answer-3.6
A protein is found to contain three different polypeptides. The best representation of its
quaternary structure would be _______. - answer-αβγ
What would be the net charge on the amino acid tyrosine at pH 7.0? - answer-0
In which level of protein structure would hydrogen bonds between R groups participate directly
in stabilization of that structure? - answer-tertiary structure
The Gibbs free energy of activation is the difference in energy: - answer-between the substrate
and the transition state
The formula V0 = (Vmax[S])/(Km + [S]) describes the relationship between _______. - answer-
enzyme activity as a function of substrate concentration
,Ibuprofen is a competitive inhibitor of the enzyme COX. Adding ibuprofen to the COX
catalyzed reaction (and not changing the substrate concentration) would have what effect on the
observed rate? - answer-The rate would go down.
An enzyme is found to contain an organic compound that is a derivative of a B vitamin. What
can be said about this bound derivative? - answer-It is a co-enzyme.
If a chemical reaction is exothermic, which of the following must be true? - answer-Heat is
released as the reaction proceeds from reactants to products.
When the substrate concentration is much greater than Km, the rate of catalysis is almost equal
to: - answer-Vmax
The drug Lipitor is a competitive inhibitor of the enzyme HMGCoA reductase. What effect
would Lipitor have on the apparent Km for the normal substrate of this enzyme? - answer-Km
would go up
Which of the following is correct concerning the differences between hemoglobin and
myoglobin? - answer-Hemoglobin exhibits cooperative binding of O2 while myoglobin does
not.
For hemoglobin, the binding of O2 to one heme has what effect on the binding of O2 to the
other hemes? - answer-It increases the affinity.
Fetal and maternal hemoglobins are examples of ________ regulation. - answer-isozyme
An example of reversible, covalent inhibition of an enzyme is ___________. - answer-
phosphorylation
The activity of the hormone insulin is regulated by ___________. - answer-proteolysis
For hemoglobin, the binding of an O2 to the ______ of heme results in a protein conformational
change that alters the binding of O2 to the other three subunits. - answer-Fe
The effect of binding of one O2 to hemoglobin on the binding of subsequent O2 molecules is an
example of ________ regulation. - answer-allosteric
What does regulation via isozymes mean? - answer-It means that different versions of an
enzyme are produced in different parts of the body.
Ibuprofen regulation of the activity of cyclooxygenase is called ________ regulation. - answer-
reversible, noncovalent
How does a nucleotide differ from a nucleoside? - answer-A nucleotide is a nucleoside with a
phosphate ester linked to the sugar.
, The chemical forces that contribute to the stability of the DNA due to the base stacking present
in the DNA helix are... - answer-van der Waals interactions
The secondary structure of DNA can be stabilized by _______. - answer-hydrogen bonding
The difference in RNA bases compared to DNA bases is _______. - answer-RNA contains
uracil instead of thymine.
In a polynucleotide like RNA, the phosphodiester linkage is between which two sugar positions
on adjacent molecules? - answer-5', 3'
The feature(s) of DNA deduced by Watson and Crick include: - answer-1. two antiparallel
polynucleotide chains coiled in a helix around a common axis
2. that the pyrimidine and purine bases lie on the inside of the helix
3. that the bases are nearly perpendicular to the axis
A common type of secondary structure in RNA is ______. - answer-stem and loop
Carbohydrates are: - answer-1. aldehydes with two or more hydroxyl groups
2. ketones with two or more hydroxyl groups
Plant starch is composed of amylose, a linear polymer of glucose, and a branched polymer of
glucose referred to as _________. - answer-amylopectin
In which polysaccharide are glucose monomers linked through α(1, 4) linkages? - answer-
glycogen, amylopectin, amylose
Monosaccharide isomers that differ about a single asymmetric carbon are also known as
________. - answer-epimers
What would be the correct term for a five-membered ring formed from a monosaccharide? -
answer-furanose
What is the storage form of lipids? - answer-triacylglycerides
Which of the following statements about membranes is correct? - answer-Membranes are
asymmetric.
What type of membrane protein can use the downhill flow of one species to drive the uphill flow
of a different species in the same direction across a membrane? - answer-symporter
Advantages of second messengers include: - answer-1. the signal can be amplified by making
many second messengers
2. second messengers can freely diffuse to other sites within the cell
3. a few common second messengers can be used in multiple signaling pathways
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