IB Biology Topic B1.2.3 Dietary Requirements for Amino Acids Revision Notes (SL/HL)

IB Biology Topic B1.2.3 Dietary Requirements for Amino Acids Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Essential Amino Acids Cannot Be Synthesised

Essential amino acids are like specialized tools your body cannot make on its own.
They must be obtained from your diet because the metabolic pathways needed to synthesize them are absent.
Without these amino acids, your body cannot produce certain proteins, which can lead to health issues such as muscle wasting, weakened immunity, or delayed growth in children.

Example

There are nine essential amino acids for humans
Examples: Lysine, Methionine, (specific names not required for this syllabus)

Non-Essential Amino Acids

Non-essential amino acids are like multipurpose tools that your body can create from other amino acids or molecules.
For instance, tyrosine, a non-essential amino acid, can be synthesized from the essential amino acid phenylalanine.
This adaptability means that even if your diet lacks certain non-essential amino acids, your body can usually compensate.

Tip

Amino acids are not stored in the body like fats or carbohydrates.
This means it's important to consume essential amino acids regularly through your diet.

Example

If your diet provides phenylalanine (an essential amino acid), your body can convert it into tyrosine.
However, if phenylalanine is missing, tyrosine becomes "conditionally essential," meaning it must now come from your diet.

The Role of Amino Acids in Diet

Why Balance Matters

Proteins in your diet are broken down into amino acids during digestion.
Amino acids are absorbed into your bloodstream and used to build the proteins your body needs.
Amino acid profile of the food you eat determines how effectively your body can meet its protein requirements.

Animal-Based Foods

Complete Proteins: Contain all nine essential amino acids in proportions similar to what the human body needs.

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

Essential Amino Acids Cannot Be Synthesised

Essential amino acids are like specialized tools your body cannot make on its own.
They must be obtained from your diet because the metabolic pathways needed to synthesize them are absent.
Without these amino acids, your body cannot produce certain proteins, which can lead to health issues such as muscle wasting, weakened immunity, or delayed growth in children.

Example

There are nine essential amino acids for humans
Examples: Lysine, Methionine, (specific names not required for this syllabus)

Non-Essential Amino Acids

Non-essential amino acids are like multipurpose tools that your body can create from other amino acids or molecules.
For instance, tyrosine, a non-essential amino acid, can be synthesized from the essential amino acid phenylalanine.
This adaptability means that even if your diet lacks certain non-essential amino acids, your body can usually compensate.

Tip

Amino acids are not stored in the body like fats or carbohydrates.
This means it's important to consume essential amino acids regularly through your diet.

Example

If your diet provides phenylalanine (an essential amino acid), your body can convert it into tyrosine.
However, if phenylalanine is missing, tyrosine becomes "conditionally essential," meaning it must now come from your diet.

The Role of Amino Acids in Diet

Why Balance Matters

Proteins in your diet are broken down into amino acids during digestion.
Amino acids are absorbed into your bloodstream and used to build the proteins your body needs.
Amino acid profile of the food you eat determines how effectively your body can meet its protein requirements.

Animal-Based Foods

Complete Proteins: Contain all nine essential amino acids in proportions similar to what the human body needs.

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 B1.2.3: Dietary Requirements for Amino Acids Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Essential Amino Acids Cannot Be Synthesised

Non-Essential Amino Acids

The Role of Amino Acids in Diet

Why Balance Matters

Animal-Based Foods

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

Essential Amino Acids Cannot Be Synthesised

Non-Essential Amino Acids

The Role of Amino Acids in Diet

Why Balance Matters

Animal-Based Foods

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