Q: A peptide is synthesized using solid-phase synthesis. If each coupling step has a yield of 95% and the peptide is 10 residues long, what is the overall yield of the peptide?

$$0.95^{10}$$ \times 100 = 59.87\%$$

Q: Which bond is formed during the condensation reaction between two amino acids?

$$\text{Peptide (amide) bond}$$

Question 1

Which of the following statements best describes the difference between biopolymers and synthetic commodity polymers?

Accepted Answer

Biopolymers have a defined monomer sequence that determines their function, whereas synthetic polymers often have random or repeating sequences.

Question 2

A peptide is synthesized using solid-phase synthesis. If each coupling step has a yield of 95% and the peptide is 10 residues long, what is the overall yield of the peptide?

Accepted Answer

$$0.95^{10}$$ 	imes 100 = 59.87\%$$

Question 3

Which bond is formed during the condensation reaction between two amino acids?

Accepted Answer

$$	ext{Peptide (amide) bond}$$

Question 4

Why is solid-phase synthesis preferred for biopolymer synthesis in the laboratory?

Accepted Answer

It allows for easy automation, minimal purification between steps, and high yields.

Question 5

Which of the following is NOT a major class of biopolymers?

Accepted Answer

Polyesters

Question 6

At neutral pH, what is the charge of a peptide with a free N-terminus, a free C-terminus, and one lysine residue?

Accepted Answer

$$+1$$

Question 7

Which property is shared by most biopolymers but not by most synthetic commodity polymers?

Accepted Answer

Defined monomer sequence

Question 8

Which of the following is a desirable feature for a biopolymer synthetic strategy?

Accepted Answer

High excesses of reagents to increase yield

Question 9

Which functional group is present in all amino acids?

Accepted Answer

Amine and carboxylic acid

Question 10

What is the main reason that the sequence of monomers in a biopolymer must be precisely controlled during synthesis?

Accepted Answer

The sequence determines the structure and function of the biopolymer.

Question 11

Which analytical technique is most commonly used to confirm the correct sequence of a biopolymer after solid-phase synthesis?

Accepted Answer

High resolution mass spectrometry

Question 12

Which of the following statements about amino acids is correct?

Accepted Answer

Natural amino acids are L-configuration and are \alpha-amino acids.

Question 13

Which bond is responsible for linking monosaccharides in polysaccharides?

Accepted Answer

$$	ext{Glycosidic bond}$$

Question 14

A peptide sequence is written as H-Ser-Ile-Gly-OH. Which terminus is represented by 'H'?

Accepted Answer

N-terminus

Question 15

Which of the following is a limitation of biosynthesis for biopolymers compared to laboratory synthesis?

Accepted Answer

Limited ability to make unnatural polymers

Question 16

What is the effect of missing a coupling step during biopolymer synthesis?

Accepted Answer

A different biopolymer with potentially different properties is produced.

Question 17

Which of the following is NOT a step in solid-phase synthesis?

Accepted Answer

Characterization of intermediates after each step

Question 18

Which property of amino acids allows them to be useful as enantiopure building blocks?

Accepted Answer

Chirality

Question 19

Which bond links nucleotides in DNA and RNA?

Accepted Answer

$$	ext{Phosphodiester bond}$$

Question 20

Which of the following is a real-world application of biopolymer synthesis?

Accepted Answer

Development of peptide drugs for diabetes and weight loss

Biopolymers: Structure, Synthesis, and Properties

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