Amino acids and protein structure

Overview

Reaction joins two amino acids, primary structure of a protein and two forms of secondary structure found in proteins.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   Name the four groups attached to the central carbon atom of an amino acid.

   Model answer

   An amino group, a carboxyl group, a hydrogen atom and a variable R group are attached to the central carbon.

2. 2

   Which part of an amino acid differs from one amino acid to another?

   Model answer

   Only the R group, or side chain, differs between amino acids.

3. 3

   What type of reaction joins two amino acids, and what is released?

   Model answer

   A condensation reaction joins them and one molecule of water is released.

4. 4

   Which two groups react when a peptide bond is formed?

   Model answer

   The carboxyl group of one amino acid reacts with the amino group of the next.

5. 5

   Define the primary structure of a protein.

   Model answer

   The primary structure is the number and sequence of amino acids in a polypeptide chain, joined by peptide bonds.

6. 6

   Name the two forms of secondary structure found in proteins.

   Model answer

   The two forms are the α-helix and the β-pleated sheet.

Other ways to work this

The same content, four other ways.

What is inside Levo

Six ways to work the same material.