IB Biology Topic B1.2.4 Infinite Variety of Possible Peptide Chains Revision Notes (SL/HL)

IB Biology Topic B1.2.4 Infinite Variety of Possible Peptide Chains Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Amino Acid Sequences: Why Twenty Building Blocks Create Unlimited Proteins

Cells use 20 different amino acids to build proteins.
Because any amino acid can occupy any position in a chain, the number of possible sequences grows exponentially with chain length.
A dipeptide (two amino acids) has 20 × 20 = 400 possible sequences.
A tripeptide has 20³ = 8,000 possible sequences.
For a polypeptide of n amino acids, the number of possible sequences is 20ⁿ.
1. Most functional proteins contain hundreds of amino acids, so the number of possible sequences is astronomically large.
The number of proteins that could theoretically exist far exceeds the number any organism actually makes.
Every species produces a specific subset of possible proteins.
1. This subset defines the species' structure, function, and behaviour at the molecular level.

Tip

To find the number of possible polypeptide sequences of length n, use the formula 20ⁿ, where 20 is the number of amino acid types.

Sequence Determines Shape, Shape Determines Function

The sequence of amino acids in a polypeptide, its primary structure, determines how the chain folds into its three-dimensional shape.
1. Different R-groups along the chain interact with each other and with water, pulling the protein into a specific shape.
2. This shape is what lets the protein do its job.

Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Unlock the rest of this chapter with a free account

Amino Acid Sequences: Why Twenty Building Blocks Create Unlimited Proteins

Cells use 20 different amino acids to build proteins.
Because any amino acid can occupy any position in a chain, the number of possible sequences grows exponentially with chain length.
A dipeptide (two amino acids) has 20 × 20 = 400 possible sequences.
A tripeptide has 20³ = 8,000 possible sequences.
For a polypeptide of n amino acids, the number of possible sequences is 20ⁿ.
1. Most functional proteins contain hundreds of amino acids, so the number of possible sequences is astronomically large.
The number of proteins that could theoretically exist far exceeds the number any organism actually makes.
Every species produces a specific subset of possible proteins.
1. This subset defines the species' structure, function, and behaviour at the molecular level.

Tip

To find the number of possible polypeptide sequences of length n, use the formula 20ⁿ, where 20 is the number of amino acid types.

Sequence Determines Shape, Shape Determines Function

The sequence of amino acids in a polypeptide, its primary structure, determines how the chain folds into its three-dimensional shape.
1. Different R-groups along the chain interact with each other and with water, pulling the protein into a specific shape.
2. This shape is what lets the protein do its job.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B1.2.4: Infinite Variety of Possible Peptide Chains Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Amino Acid Sequences: Why Twenty Building Blocks Create Unlimited Proteins

Sequence Determines Shape, Shape Determines Function

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Amino Acid Sequences: Why Twenty Building Blocks Create Unlimited Proteins

Sequence Determines Shape, Shape Determines Function

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account