ACS CP ACS CP Biochemistry & Polymer Chemistry

Question 1

Which type of bond is primarily responsible for the secondary structure (alpha-helix and beta-sheet) of proteins?

Accepted Answer

Hydrogen bonds

Answer

Disulfide bonds

Answer

Ionic bonds

Answer

Van der Waals forces

Question 2

The Michaelis-Menten equation describes the relationship between:

Accepted Answer

Substrate concentration and initial reaction velocity for an enzyme-catalyzed reaction

Answer

Enzyme inhibitor concentration and reaction rate

Answer

Temperature and enzyme activity

Answer

pH and enzyme denaturation

Question 3

Which polymer property describes the distribution of molecular weights in a polymer sample?

Accepted Answer

Polydispersity index (PDI)

Answer

Degree of polymerization

Answer

Glass transition temperature

Answer

Crystallinity percentage

Question 4

In step-growth polymerization, high molecular weight polymer is obtained only:

Accepted Answer

At very high conversions (>99%) of functional groups

Answer

At the very beginning of the reaction when monomer concentration is highest

Answer

When a large excess of one monomer is used

Answer

When reaction temperature is kept below the ceiling temperature

Question 5

The ATP hydrolysis reaction (ATP → ADP + Pi) releases approximately how much free energy under standard biological conditions?

Accepted Answer

-7.3 kcal/mol

Answer

-14.6 kcal/mol

Answer

-3.6 kcal/mol

Answer

-20.0 kcal/mol

Question 6

Which technique separates proteins based on their isoelectric point (pI)?

Accepted Answer

Isoelectric focusing (IEF)

Answer

SDS-PAGE

Answer

Size exclusion chromatography

Answer

Affinity chromatography