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Biochemistry I- Rutgers Exam 1 Questions and Answers – Updated 2024

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Biochemistry I- Rutgers Exam 1 Questions and Answers – Updated 2024 Which will show the greater degree of dissociation: formic acid (pKa = 3.75) or acetic acid (pKa = 4.76) if dissolved in water at 0.1 M concentrations? A. Formic acid C. Within the accuracy of measurement they will be equally...

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FIRST PUBLISH OCTOBER 2024

Biochemistry I- Rutgers Exam 1
Questions and Answers – Updated 2024

Which will show the greater degree of dissociation: formic acid (pKa = 3.75) or acetic acid (pKa = 4.76) if

dissolved in water at 0.1 M concentrations?

A. Formic acid C. Within the accuracy of measurement they will be equally dissociated. B. Acetic acid D.

Cannot tell from data given. - Ans:✔✔-A. Formic acid

Which will show the greater degree of dissociation: formic acid (pKa = 3.75) or acetic acid (pKa = 4.76) if

dissolved at 0.1 M concentrations in solutions whose pH is 11.0?

A. Formic acid C. Within the accuracy of measurement they will be equally dissociated. B. Acetic acid D.

Cannot tell from data given. - Ans:✔✔-C. Within the accuracy of measurement they will be equally

dissociated.

Which of the following experimental observations disproved the vitalist claim that the substances of

which living matter is composed are qualitatively different from those which compose the non-living

world?

A. the demonstration by the Buchner brothers that broken and therefore dead yeast cells could convert

sugar into ethanol B. the crystallization by Sumner of the enzyme urease C. Pasteur's proof that living
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organisms arise only from other living organisms rather than by spontaneous generation caused by the

"vital force" D. Wöhler's synthesis of urea from ammonium cyanate E. none of the above - Ans:✔✔-D.

Wöhler's synthesis of urea from ammonium cyanate

At pH 6.5 ribonuclease-A has a net charge of +4. At pH 2 the protein has a net charge of +19. If the

protein is dissolved in 0.1 M KCl at both pHs, and if the solution contains no other solutes, in which case

will the protein molecules have a larger number of chloride ions in their immediate vicinity?

A. pH 2 C. a pH midway between 2 and 6.5 B. pH 6.5 D. It will have the same number of chlorides at the

two pHs. E. cannot tell from data given. - Ans:✔✔-A. PH 2

The free energy of a reaction which is not at equilibrium, such as is the case in nearly all cellular

reactions, involves two terms: the standard free energy at equilibrium and a term expressing the

deviation of the actual

conditions from equilibrium. In the Henderson-Hasselbalch equation governing buffers, the equivalent of

the standard free energy term occurs at the pH at which

A. the weak acid is fully dissociated. D. half the weak acid is dissociated. B. the weak acid is fully in the

undissociated form. E. none of the above. C. the pH = the pI. - Ans:✔✔-D. the weak acid is fully in the

undissociated form

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Which of the following is best described as an entropy driven reaction?

A. H = -82 kJ/mol, -TS = -136 kJ/mol D. none of the above is entropy driven B. H = -1367 kJ/mol, -TS =

+41 kJ/mol E. all the above are entropy driven. C. H = +110 kJ/mol, -TS = -140 kJ/mol - Ans:✔✔-C. delta

H= +110 kJ/mol

Rank the following vitalist statements in order of decreasing breadth of their claims about the living

world.

1. Living matter may be composed of the same materials as non-living matter, but organisms arise from

non-living matter by spontaneous generation by intervention of the "vital force." 2. The substances

composing living mater are qualitatively different from those of the non-living world. 3. The structure of

enzymes is too complex to be described in chemical terms, and the nature of biological catalysis is not

comprehensible. 4. We may be able to make some of the substances of living matter, but the reactions

which constitute life occur only in living cells.

A. 1,2,3,4 B. 4,3,2,1 C. 2,1,4,3 D. 3,2,4,1 E. none of these - Ans:✔✔-C. 2, 1, 4, 3

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