$$\text{Amino acid}_1 + \text{Amino acid}_2 \rightarrow \text{Dipeptide} + H_2O$$

Question 1

Which part of an amino acid determines its unique chemical properties and classification as polar or nonpolar?

Accepted Answer

The R-group (side chain)

Question 2

Which of the following amino acids is classified as nonpolar (hydrophobic)?

Accepted Answer

Alanine

Question 3

What type of reaction forms a peptide bond between two amino acids?

Accepted Answer

Dehydration synthesis (condensation)

Question 4

Which of the following best describes the relationship between monomers and polymers in proteins?

Accepted Answer

Proteins are polymers made of amino acid monomers

Question 5

During the formation of a dipeptide from two amino acids, what molecule is released?

Accepted Answer

Water ($$H_2O)$$

Question 6

Which of the following R-groups would make an amino acid acidic?

Accepted Answer

$$-CH_2COOH$$

Question 7

If a protein is hydrolyzed, what is the result?

Accepted Answer

A water molecule is consumed and amino acids are released

Question 8

Which sequence correctly represents the flow of genetic information for protein synthesis?

Accepted Answer

DNA $$\rightarrow$$ mRNA $$\rightarrow$$ Protein

Question 9

A tripeptide is formed from three amino acids. How many peptide bonds are present in this molecule?

Accepted Answer

Two

Question 10

Which of the following statements about peptide bonds is correct?

Accepted Answer

They form between the amino group of one amino acid and the carboxyl group of another

Question 11

Which amino acid would you expect to find in the interior of a protein that is embedded in a cell membrane?

Accepted Answer

Leucine

Question 12

What is the correct term for a polymer consisting of ten amino acids?

Accepted Answer

Decapeptide

Question 13

Which of the following best explains why the order of amino acids in a protein is important?

Accepted Answer

It determines the protein's function and structure

Question 14

Which amino acid has an R-group of $$-CH_2CH_2CH_2CH_2NH_2$$ and is classified as basic?

Accepted Answer

Lysine

Question 15

If you combine glycine and alanine through dehydration synthesis, what are the products?

Accepted Answer

A dipeptide and water

Question 16

Which of the following is true about the bonds formed by carbon, oxygen, and nitrogen in amino acids?

Accepted Answer

Each carbon forms four bonds, each oxygen forms two bonds, and each nitrogen forms three bonds

Question 17

Which process would you use to break a dipeptide into its constituent amino acids?

Accepted Answer

Hydrolysis

Question 18

A mutation changes the R-group of an amino acid in a protein from $$-CH_3$ to -CH_2$$COOH$$. What is the most likely effect?

Accepted Answer

The amino acid changes from nonpolar to acidic

Question 19

Which of the following best describes the difference between a dipeptide and a tripeptide?

Accepted Answer

A dipeptide contains two amino acids, while a tripeptide contains three

Question 20

Which of the following is a correct example of a dehydration synthesis reaction involving amino acids?

Accepted Answer

$$	ext{Amino acid}_1 + 	ext{Amino acid}_2 ightarrow 	ext{Dipeptide} + H_2O$$

Proteins and Amino Acids: Structure, Classification, and Synthesis

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