Peptide links/Formation of a Protein Flashcards Preview

Home Economics: 01.3 - Proteins > Peptide links/Formation of a Protein > Flashcards

Flashcards in Peptide links/Formation of a Protein Deck (14)
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1

How are proteins formed?

When two amino acids join together

2

What is a peptide link?

The join of two amino acids

3

What happens when a peptide link is formed?

A water is lost at the join

4

What is the first step of the formation of a peptide link?

The COOH group of one amino acid reacts with the NH2 group of another (The carboxyl end of one amino acid joins with the amino end of the next with the lost of a water)

5

What happens to the carboxyl end during the formation of a peptide bond?

The COOH group loses an OH group

6

What happens to the amino group during the formation of a peptide bond?

The NH2 group loses a hydrogen atom

7

What happens when the OH has been lost from the carboxyl end and the H has been lost from the amino end?

They OH and H combine to form a water molecule which is lost

8

What is the resulting bond that is formed between the carboxyl end and the amino end after the loss of a water?

CO-NH

9

What is two amino acids bonded together called?

A dipeptide

10

What is more than 20 amino acids bonded together called?

A polypeptide

11

What is more than 50 amino acids bonded together called?

A protein

12

How many polypeptides are present in a protein?

One or more

13

What is the loss of water at the join between a COOH and NH2 group called?

A condensation reaction

14

Outline how a protein is formed.
(3)

The COOH of one amino acid combines with the NH2 amino group an another amino acid with the release of a water (condensation reaction) to form a peptide bond.
The COOH loses an OH group and the NH2 group loses a H
The resulting bond is CO-NH