Biochemistry

Small ions in biological fluids:

Small ions in biological fluids:

Small ions in biological fluids:
A) encourage strong electrostatic interactions between oppositely charged macroions at low ionic strengths.
B) encourage strong electrostatic interactions between oppositely charged macroions at high ionic s

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jgosset2

A biochemical reaction will proceed in the direction as written if:

A biochemical reaction will proceed in the direction as written if:

A biochemical reaction will proceed in the direction as written if:
A) △G = zero.
B) △G > 0.
C) △G < 0.
D) △H > 0.
E) △H < 0.

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BurgaskO

Life is an irreversible process, such that it never comes to equilibrium.T/F?

Life is an irreversible process, such that it never comes to equilibrium.T/F?

Life is an irreversible process, such that it never comes to equilibrium.
T/F?

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jgosset2

The equilibrium constant of a reaction:

The equilibrium constant of a reaction:

The equilibrium constant of a reaction:
A) is not related to the change in free energy of the reaction.
B) is the same as the mass action ratio when the reaction is displaced from equilibrium.
C) can change if the concentration of reac

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Nyntti

The change in enthalpy (△H) for the complete oxidation of a fatty acid is different depending on ...

The change in enthalpy (△H) for the complete oxidation of a fatty acid is different depending on ...

The change in enthalpy (△H) for the complete oxidation of a fatty acid is different depending on whether it occurs via a biochemical pathway or combustion to CO2 and H2O.
T/F?

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Nyntti

A reaction at equilibrium can be driven in one direction or the other by changing the ________ of ...

A reaction at equilibrium can be driven in one direction or the other by changing the ________ of ...

A reaction at equilibrium can be driven in one direction or the other by changing the ________ of reactants or products.

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Nyntti

A thermodynamically unfavorable reaction can become favorable if the mass action ratio is ________ ...

A thermodynamically unfavorable reaction can become favorable if the mass action ratio is ________ ...

A thermodynamically unfavorable reaction can become favorable if the mass action ratio is ________ than the equilibrium mass action ratio.

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BurgaskO

Calculate the △G∘' for the reaction fructose-6-phosphate → glucose-6-phosphate given the ...

Calculate the △G∘' for the reaction fructose-6-phosphate → glucose-6-phosphate given the ...

Calculate the △G∘' for the reaction

fructose-6-phosphate → glucose-6-phosphate

given the equilibrium constant is 1.97 and the physiological relevant temperature is 37∘C.

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nobunaga1

A reaction with a large negative free energy of hydrolysis can be coupled to the synthesis of ATP ...

A reaction with a large negative free energy of hydrolysis can be coupled to the synthesis of ATP ...

A reaction with a large negative free energy of hydrolysis can be coupled to the synthesis of ATP from ADP and Pi.
T/F?

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BurgaskO

In a general redox reaction, the reductant becomes oxidized and the oxidant becomes reduced.T/F?

In a general redox reaction, the reductant becomes oxidized and the oxidant becomes reduced.T/F?

In a general redox reaction, the reductant becomes oxidized and the oxidant becomes reduced.
T/F?

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Nyntti

The standard reduction potential is a measure of the ability of a reductant to ________ an electron.

The standard reduction potential is a measure of the ability of a reductant to ________ an electron.

The standard reduction potential is a measure of the ability of a reductant to ________ an electron.

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BurgaskO

The difference between a nucleoside and a nucleotide is:

The difference between a nucleoside and a nucleotide is:

The difference between a nucleoside and a nucleotide is:
A) the presence of uracil.
B) a phosphate group.
C) a phosphodiester bond.
D) a 2' —H group.
E) methylated cytosine.

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BurgaskO

Nucleotides are all weak acids.T/F?

Nucleotides are all weak acids.T/F?

Nucleotides are all weak acids.
T/F?

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Nyntti

Which of the following does NOT describe the secondary structure of DNA as proposed by Watson and ...

Which of the following does NOT describe the secondary structure of DNA as proposed by Watson and ...

Which of the following does NOT describe the secondary structure of DNA as proposed by Watson and Crick?
A) The two strands of the double helix are stabilized by hydrogen-bonding between A and T and between G and C.
B) The two strands of th

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BurgaskO

The mode of replication of DNA is BEST described as ________.

The mode of replication of DNA is BEST described as ________.

The mode of replication of DNA is BEST described as ________.

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jgosset2

Which of the following statements about nucleic acid secondary structure is FALSE?

Which of the following statements about nucleic acid secondary structure is FALSE?

Which of the following statements about nucleic acid secondary structure is FALSE?
A) The width of the major and minor grooves is more equal in the A-from of DNA than in the B-form.
B) Triple helices and G-quadruplexes can form at specific

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Nyntti

Calculate the superhelix density of a circular DNA molecule with 210 base pairs and two negative ...

Calculate the superhelix density of a circular DNA molecule with 210 base pairs and two negative ...

Calculate the superhelix density of a circular DNA molecule with 210 base pairs and two negative supercoils, assuming that there are 10.5 bp per turn of the double helix.

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Nyntti

Calculate the linking number in vivo for a plasmid that is 4200 bp in size if there is normally 1 ...

Calculate the linking number in vivo for a plasmid that is 4200 bp in size if there is normally 1 ...

Calculate the linking number in vivo for a plasmid that is 4200 bp in size if there is normally 1 negative supercoil in every 20 base pairs of a circular DNA. Assume there are 10.5 bp per turn of the double helix.

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Nyntti

Nucleic acids absorb light strongly in the ultraviolet region of the spectrum because they have ...

Nucleic acids absorb light strongly in the ultraviolet region of the spectrum because they have ...

Nucleic acids absorb light strongly in the ultraviolet region of the spectrum because they have ________ double-bond systems.

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BurgaskO

The melting temperature of DNA ________ with increasing G plus C content.

The melting temperature of DNA ________ with increasing G plus C content.

The melting temperature of DNA ________ with increasing G plus C content.

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BurgaskO

Restriction endonucleases are useful in gene cloning because:

Restriction endonucleases are useful in gene cloning because:

Restriction endonucleases are useful in gene cloning because:
A) they can cut DNA at specific sequences.
B) they can join DNA molecules that have been cut at specific sequences.
C) they all make cohesive ends when they cut DNA.
D)

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Nyntti

Viral genomes cannot be used as vectors for making recombinant DNA molecules.T/F?

Viral genomes cannot be used as vectors for making recombinant DNA molecules.T/F?

Viral genomes cannot be used as vectors for making recombinant DNA molecules.
T/F?

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BurgaskO

Which of the following is a feature of X-diffraction?

Which of the following is a feature of X-diffraction?

Which of the following is a feature of X-diffraction?
A) Radiation passing through a structure will be scattered only if the structure contains repeating units.
B) Scattered radiation from repeating units in a structure will be weakened by

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Nyntti

Which of the following amino acids would most likely be found on the surface of a protein?

Which of the following amino acids would most likely be found on the surface of a protein?

Which of the following amino acids would most likely be found on the surface of a protein?
A) Aspartic acid
B) Leucine
C) Proline
D) Valine
E)  Phenylalanine

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BurgaskO

Protein biosynthesis uses only L-amino acids.T/F?

Protein biosynthesis uses only L-amino acids.T/F?

Protein biosynthesis uses only L-amino acids.
T/F?

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BurgaskO

All amino acids have a chiral α-carbon EXCEPT ________.

All amino acids have a chiral α-carbon EXCEPT ________.

All amino acids have a chiral α-carbon EXCEPT ________.

3493954   124   1 Reply

jgosset2

All amino acids have a chiral α-carbon EXCEPT ________.

All amino acids have a chiral α-carbon EXCEPT ________.

All amino acids have a chiral α-carbon EXCEPT ________.

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Nyntti

The side chain of ________ has a pKa in the physiological pH range and is therefore often involved ...

The side chain of ________ has a pKa in the physiological pH range and is therefore often involved ...

The side chain of ________ has a pKa in the physiological pH range and is therefore often involved in proton transfer during enzymatic catalysis.

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Nyntti

At physiological pH, the carboxylic acid group of an amino acid will be ________, while the amino ...

At physiological pH, the carboxylic acid group of an amino acid will be ________, while the amino ...

At physiological pH, the carboxylic acid group of an amino acid will be ________, while the amino group will be ________, yielding the zwitterion form.

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BurgaskO

An amide bond between the α-carboxylic acid group of one amino acid and the α-amino group on ...

An amide bond between the α-carboxylic acid group of one amino acid and the α-amino group on ...

An amide bond between the α-carboxylic acid group of one amino acid and the α-amino group on another is called a ________.

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Nyntti

The chemical ________ can cleave amide bonds on the C-terminal side of methionine residues.

The chemical ________ can cleave amide bonds on the C-terminal side of methionine residues.

The chemical ________ can cleave amide bonds on the C-terminal side of methionine residues.

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BurgaskO

Most proteins have blocked amino and carboxyl terminals.T/F?

Most proteins have blocked amino and carboxyl terminals.T/F?

Most proteins have blocked amino and carboxyl terminals.
T/F?

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BurgaskO

Recombinant proteins containing a ________ can be purified using immobilized metal affinity ...

Recombinant proteins containing a ________ can be purified using immobilized metal affinity ...

Recombinant proteins containing a ________ can be purified using immobilized metal affinity chromatography and eluted by the addition of imidazole, a low pH buffer or a buffer containing EDTA.

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Nyntti

Applications of mass spectrometry include:

Applications of mass spectrometry include:

Applications of mass spectrometry include:
A) determination of the mass of a protein.
B) determining the primary structure of proteins.
C) detection of post-translational modifications on proteins.
D) A and B.
E) A, B, and C.

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Nyntti

In considering protein secondary structure which of the following is INCORRECT?

In considering protein secondary structure which of the following is INCORRECT?

In considering protein secondary structure which of the following is INCORRECT?
A) An α helix repeats after 18 residues and has 3.6 residues per turn.
B) A network of main-chain hydrogen bonds connect β strands in a β sheet.
C) The mos

3493954   104   1 Reply

BurgaskO

A ________ plot describes which structures in a polypeptide are sterically possible and which are ...

A ________ plot describes which structures in a polypeptide are sterically possible and which are ...

A ________ plot describes which structures in a polypeptide are sterically possible and which are not based on the angles of rotation about the backbone Namide —Cα and Cα-Ccarbonyl bonds.

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Nyntti

Which of the following statements about α-keratins is FALSE?

Which of the following statements about α-keratins is FALSE?

Which of the following statements about α-keratins is FALSE?
A) They include a major class of protein that comprises hair, fingernails and animal skin.
B) Individual molecules are α-helical.
C) There is a strip of contiguous hydrophobi

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Nyntti

Scurvy results in weakness in collagen fibres because the enzymes that catalyze ________ of proline ...

Scurvy results in weakness in collagen fibres because the enzymes that catalyze ________ of proline ...

Scurvy results in weakness in collagen fibres because the enzymes that catalyze ________ of proline and lysine residues in collagen require Vitamin C.

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BurgaskO

Proteins cannot self-assemble into a functional conformation after they have been denatured.T/F?

Proteins cannot self-assemble into a functional conformation after they have been denatured.T/F?

Proteins cannot self-assemble into a functional conformation after they have been denatured.
T/F?

3493954   72   1 Reply

BurgaskO

The interactions that stabilize multisubunit complexes are different to those that stabilize ...

The interactions that stabilize multisubunit complexes are different to those that stabilize ...

The interactions that stabilize multisubunit complexes are different to those that stabilize tertiary structure.
T/F?

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BurgaskO