ACS CP ACS CP Biochemistry & Polymer Chemistry 2

Question 1

Glass transition temperature (Tg) in polymers represents:

Accepted Answer

The temperature below which amorphous polymer segments become rigid and glassy

Answer

The temperature at which a polymer melts and flows like a liquid

Answer

The decomposition temperature of the polymer backbone

Answer

The melting point of crystalline polymer domains

Question 2

Which coenzyme is essential for oxidation-reduction reactions and acts as an electron carrier in cellular respiration?

Accepted Answer

NAD+/NADH

Answer

Coenzyme A (CoA)

Answer

Pyridoxal phosphate (PLP)

Answer

Thiamine pyrophosphate (TPP)

Question 3

Free radical chain polymerization consists of which three fundamental steps?

Accepted Answer

Initiation, propagation, termination

Answer

Initiation, condensation, termination

Answer

Activation, chain transfer, deactivation

Answer

Nucleation, growth, crystallization

Question 4

DNA replication is described as semi-conservative, meaning:

Accepted Answer

Each new double helix contains one original strand and one newly synthesized strand

Answer

Only half of the DNA is replicated during each cell division

Answer

DNA is replicated conservatively in eukaryotes but dispersively in prokaryotes

Answer

Replication is initiated at only one origin per chromosome

Question 5

Which type of polymer exhibits both viscous and elastic behavior, behaving like a liquid at long time scales and a solid at short time scales?

Accepted Answer

Viscoelastic polymer

Answer

Crystalline thermoplastic

Answer

Thermoset polymer

Answer

Liquid crystalline polymer

Question 6

The citric acid cycle (Krebs cycle) primarily functions to:

Accepted Answer

Oxidize acetyl-CoA to CO2 while generating reduced electron carriers (NADH, FADH2)

Answer

Convert glucose to pyruvate for energy production

Answer

Synthesize glucose from non-carbohydrate precursors

Answer

Convert fatty acids to ketone bodies