BIOCHEMISTRY ACS STUDY GUIDE
|LATEST UPDATE {GRADED A+}
Each of the following subcellular structures contains DNA EXCEPT
A. the nucleus.
B. ribosomes.
C. chloroplasts.
D. mitochondria. - ✔✔B
In plant and animal cells, the three-dimensional integrity of the cell
is maintained, in part, by an internal network of filaments called
A. the cell wall.
B. the Golgi apparatus.
C. the cytoskeleton.
D. the endoplasmic reticulum. - ✔✔C
Of the following, which are prokaryotes?
,A. viruses
B. bacteria
C. yeast
D. plant cells - ✔✔B
G° for the conversion of glycerol-3-phosphate to glycerol + Pi is -2.2
kcal/mole. Thus, you can conclude that
A. this reaction will occur spontaneously.
B. this reaction may or may not occur spontaneously, depending on the
actual concentrations of reactants and products.
C. this reaction will only occur spontaneously if it is coupled to
another reaction that has a more favorable G°.
D. this reaction is so strongly favorable that it could be coupled to
drive an otherwise unfavorable cell reaction. - ✔✔B
In most biochemical reactions, ∆PV is
A. negligible
B. positive
C. negative
D. dependent on ∆E - ✔✔A
According to the Second Law of Thermodymnamics,
,A. the total entropy change in any reaction that occurs spontaneously must
be greater than 0.
B. the total entropy change in any reaction that occurs spontaneously must
be less than 0.
C. the total entropy of the universe remains constant.
D. the total entropy of the universe is always decreasing. - ✔✔A
Which of the following is true?
A. Liquid and solid water have the same number of hydrogen bonds per
molecule of water
B. Liquid water has more hydrogen bonds per molecule than does solid
water
C. Solid water has more hydrogen bonds per molecule than does liquid
water
D. Hydrogen bonding is a major factor in the structure of gaseous water
E. None is true - ✔✔C
What is the pH of an aqueous solution that has a [OH-] of 3.45 x 10-5 M?
A. 3.47
B. 4.47
C. 5.53
, D. 9.54
E. none of the above - ✔✔D
A peptide was found to have a molecular mass of about 650 and upon
hydrolysis produced Ala, Cys, Lys, Phe, and Val in a 1:1:1:1:1 ratio. The
peptide upon treatment with Sanger's reagent produced DNP-Cys and
exposure to carboxypeptidase produced valine. Chymotrypsin treatment of
the peptide produced a dipeptide that contained sulfur and has a UV
absorbance, and a tripeptide. Exposure of the peptide to trypsin produced a
dipeptide and a tripeptide. Deduce the sequence of the peptide.
A. Val-Ala-Lys-Phe-Cys
B. Cys-Lys-Phe-Ala-Val
C. Cys-Ala-Lys-Phe-Val
D. Cys-Phe-Lys-Ala-Val
E. Val-Phe-Lys-Ala-Cys - ✔✔D
Which amino acid has an R-group pKa closest to physiological pH?
A. lysine
B. histidine
C. glutamate
D. arginine
E. aspartate - ✔✔B
|LATEST UPDATE {GRADED A+}
Each of the following subcellular structures contains DNA EXCEPT
A. the nucleus.
B. ribosomes.
C. chloroplasts.
D. mitochondria. - ✔✔B
In plant and animal cells, the three-dimensional integrity of the cell
is maintained, in part, by an internal network of filaments called
A. the cell wall.
B. the Golgi apparatus.
C. the cytoskeleton.
D. the endoplasmic reticulum. - ✔✔C
Of the following, which are prokaryotes?
,A. viruses
B. bacteria
C. yeast
D. plant cells - ✔✔B
G° for the conversion of glycerol-3-phosphate to glycerol + Pi is -2.2
kcal/mole. Thus, you can conclude that
A. this reaction will occur spontaneously.
B. this reaction may or may not occur spontaneously, depending on the
actual concentrations of reactants and products.
C. this reaction will only occur spontaneously if it is coupled to
another reaction that has a more favorable G°.
D. this reaction is so strongly favorable that it could be coupled to
drive an otherwise unfavorable cell reaction. - ✔✔B
In most biochemical reactions, ∆PV is
A. negligible
B. positive
C. negative
D. dependent on ∆E - ✔✔A
According to the Second Law of Thermodymnamics,
,A. the total entropy change in any reaction that occurs spontaneously must
be greater than 0.
B. the total entropy change in any reaction that occurs spontaneously must
be less than 0.
C. the total entropy of the universe remains constant.
D. the total entropy of the universe is always decreasing. - ✔✔A
Which of the following is true?
A. Liquid and solid water have the same number of hydrogen bonds per
molecule of water
B. Liquid water has more hydrogen bonds per molecule than does solid
water
C. Solid water has more hydrogen bonds per molecule than does liquid
water
D. Hydrogen bonding is a major factor in the structure of gaseous water
E. None is true - ✔✔C
What is the pH of an aqueous solution that has a [OH-] of 3.45 x 10-5 M?
A. 3.47
B. 4.47
C. 5.53
, D. 9.54
E. none of the above - ✔✔D
A peptide was found to have a molecular mass of about 650 and upon
hydrolysis produced Ala, Cys, Lys, Phe, and Val in a 1:1:1:1:1 ratio. The
peptide upon treatment with Sanger's reagent produced DNP-Cys and
exposure to carboxypeptidase produced valine. Chymotrypsin treatment of
the peptide produced a dipeptide that contained sulfur and has a UV
absorbance, and a tripeptide. Exposure of the peptide to trypsin produced a
dipeptide and a tripeptide. Deduce the sequence of the peptide.
A. Val-Ala-Lys-Phe-Cys
B. Cys-Lys-Phe-Ala-Val
C. Cys-Ala-Lys-Phe-Val
D. Cys-Phe-Lys-Ala-Val
E. Val-Phe-Lys-Ala-Cys - ✔✔D
Which amino acid has an R-group pKa closest to physiological pH?
A. lysine
B. histidine
C. glutamate
D. arginine
E. aspartate - ✔✔B
