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Analysing Scientific Interrelationships - Example 2
Instructions
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6
The peptide X consists of a chain of 10 amino acids.
Each amino acid is designated by three letters (for example: “Trp”).
The sequence of the amino acids is shown from left to right.
One end of the peptide is formed by the amino acid Gly, the other end by the amino acid Leu.
With the enzyme Ch, the peptide X is split behind the amino acids Tyr and Trp.
The following four parts come about as a result:
- Lys – Gly
- Leu – Ala – Tyr
- ILys – Gly – Trp
- Arg – Tyr
With the enzyme Tr, the peptide X is split behind the amino acids Arg and Lys.
The following four parts come about as a result:
- Gly – Trp – Arg
- Tyr – Lys
- Gly
- Leu – Ala – Tyr – Lys
What is the structure of peptide X?
Degree of difficulty: low to medium
Solution
Sequence A can be composed of the four parts which come about through division with the
enzyme Ch. However, sequence A cannot be composed of the four parts which come about
through division with the enzyme Tr. Sequence A is therefore wrong.
Sequence B is already wrong simply because it starts with the amino acid Gly and ends with Gly.
The amino acid Leu has to form one end of the peptide X.
Sequence C cannot be composed of the four parts which come about through division with the
enzyme Ch. Sequence C is therefore wrong.
Sequence D can be composed of the four parts which come about through division with the enzyme
Ch. Sequence D can also be composed of the four parts which come about through division with
the enzyme Tr. Sequence D is therefore correct.
Instructions
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6