ACS CP ACS CP Biochemistry & Polymer Chemistry 3

Question 1

Nylon 6,6 is an example of which type of polymer?

Accepted Answer

Condensation polymer formed from a diamine and a diacid

Answer

Addition polymer formed from a single bifunctional monomer

Answer

Ring-opening polymer formed from a cyclic amine

Answer

Cross-linked thermoset formed from epoxy and amine

Question 2

Which protein structural level describes the three-dimensional folding of a single polypeptide chain?

Accepted Answer

Tertiary structure

Answer

Primary structure

Answer

Secondary structure

Answer

Quaternary structure

Question 3

Living polymerization techniques (ATRP, RAFT, NMP) are valued in polymer chemistry primarily because they allow:

Accepted Answer

Precise control of molecular weight, narrow PDI, and synthesis of block copolymers

Answer

Much faster reaction rates than conventional free radical polymerization

Answer

Use of cheaper monomers not suitable for conventional polymerization

Answer

Elimination of the need for initiators or catalysts

Question 4

Enzyme competitive inhibition is characterized by which observation on a Lineweaver-Burk double-reciprocal plot?

Accepted Answer

Different x-intercept (changed apparent Km), same y-intercept (unchanged Vmax)

Answer

Same x-intercept (unchanged Km), different y-intercept (changed Vmax)

Answer

Both x-intercept and y-intercept change

Answer

No change in either intercept

Question 5

Which spectroscopic technique is most useful for determining the degree of crystallinity in a semi-crystalline polymer?

Accepted Answer

X-ray diffraction (XRD)

Answer

UV-Vis spectroscopy

Answer

Nuclear magnetic resonance (NMR)

Answer

Infrared spectroscopy (IR)

Question 6

Post-translational modifications (PTMs) of proteins include all of the following EXCEPT:

Accepted Answer

Methylation of mRNA cap structures

Answer

Phosphorylation of serine residues

Answer

Glycosylation of asparagine residues

Answer

Ubiquitination targeting proteins for degradation