IB Biology Topic B1.1.8 Hydrophobic Properties of Lipids Revision Notes (SL/HL)

IB Biology Topic B1.1.8 Hydrophobic Properties of Lipids Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Why Lipids Are Hydrophobic

Lipids are built mainly from carbon and hydrogen atoms bonded together in long hydrocarbon chains or ring structures.
1. The C-H bond is non-polar, meaning electrons are shared roughly equally between the two atoms.
2. Because these bonds carry no partial charges, lipid molecules cannot form hydrogen bonds with water.
Water molecules form a cohesive network held together by hydrogen bonding.
1. Non-polar molecules like lipids cannot join this network, so water molecules preferentially bond with each other and push lipid molecules aside.
2. This is why oil forms droplets in water instead of dissolving: the lipid molecules cluster together because they are excluded from the surrounding water.

Analogy

Think of water molecules as a group of people holding hands at a party.
Lipids don't know the handshake, so they're left to cluster together on the sidelines.

Types of Lipids: Varying Degrees of Hydrophobicity

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

End of article

Why Lipids Are Hydrophobic

Lipids are built mainly from carbon and hydrogen atoms bonded together in long hydrocarbon chains or ring structures.
1. The C-H bond is non-polar, meaning electrons are shared roughly equally between the two atoms.
2. Because these bonds carry no partial charges, lipid molecules cannot form hydrogen bonds with water.
Water molecules form a cohesive network held together by hydrogen bonding.
1. Non-polar molecules like lipids cannot join this network, so water molecules preferentially bond with each other and push lipid molecules aside.
2. This is why oil forms droplets in water instead of dissolving: the lipid molecules cluster together because they are excluded from the surrounding water.

Analogy

Think of water molecules as a group of people holding hands at a party.
Lipids don't know the handshake, so they're left to cluster together on the sidelines.

Types of Lipids: Varying Degrees of Hydrophobicity

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.

Unlock the rest of this chapter with a free account

End of article

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B1.1.8: Hydrophobic Properties of Lipids Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Why Lipids Are Hydrophobic

Types of Lipids: Varying Degrees of Hydrophobicity

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

Why Lipids Are Hydrophobic

Types of Lipids: Varying Degrees of Hydrophobicity

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