Question

1. how many amino acids are involved in the reaction to make a dipeptide? 5. in model 1 the original amino acids are combined through a condensation reaction to make the dipeptide. a. what does r₁ represent in the dipeptide? b. what does r₂ represent in the dipeptide? 6. put a box around the atoms in the amino acids that become the h₂o molecule produced by the reaction in model 1. 7. a peptide bond is a covalent bond linking two amino acids together in a peptide. a. circle the peptide bond in model 1. b. between which two atoms in the dipeptide is the peptide bond located? c. between what two functional groups is the peptide bond located? 8. there are 22 different amino acids found in nature. two were shown in model 1. additional examples are shown below. write one or two grammatically correct sentences to describe how these amino acids are similar and how they are different. use the terms r - group, amine group, and carboxyl group in your description. glycine (gly) cysteine (cys) asparagine (asn) phenylalanine (phe)

Explanation:

Step1: Answer question 4

A dipeptide is formed by the reaction of 2 amino - acids.

Step2: Answer question 5a

In a dipeptide, $R_1$ represents the side - chain of the first amino acid.

Step3: Answer question 5b

In a dipeptide, $R_2$ represents the side - chain of the second amino acid.

Step4: Answer question 6

In a condensation reaction to form a dipeptide, the hydrogen from the amine group ($-NH_2$) of one amino acid and the $-OH$ from the carboxyl group ($-COOH$) of the other amino acid combine to form $H_2O$. So, box the $H$ of the amine group and the $OH$ of the carboxyl group.

Step5: Answer question 7a

The peptide bond in a dipeptide structure is the $-CO - NH-$ bond. Circle this bond in Model 1.

Step6: Answer question 7b

The peptide bond is located between the carbon (C) atom of the carboxyl group of one amino acid and the nitrogen (N) atom of the amine group of the other amino acid.

Step7: Answer question 7c

The peptide bond is located between the carboxyl group ($-COOH$) and the amine group ($-NH_2$).

Step8: Answer question 8

Similarity: All amino acids have an amine group ($-NH_2$) and a carboxyl group ($-COOH$) attached to the central carbon atom. Difference: They have different R - groups. For example, Glycine has a simple $H$ as its R - group, Cysteine has a $-CH_2SH$ R - group, Asparagine has a $-CH_2CONH_2$ R - group and Phenylalanine has a $-CH_2C_6H_5$ R - group.

Answer:

1. 2

5a. The side - chain of the first amino acid
5b. The side - chain of the second amino acid

1. Box the $H$ of the amine group and the $OH$ of the carboxyl group

7a. Circle the $-CO - NH-$ bond
7b. Between the carbon (C) of the carboxyl group and the nitrogen (N) of the amine group
7c. Between the carboxyl group and the amine group

1. Similarity: All have an amine and a carboxyl group attached to the central carbon. Difference: Different R - groups.