Hey there! Sign in to join this conversationNew here? Join for free

What is the difference between a polar R-group & a charged R-group on an amino acid? watch

    • Thread Starter
    Offline

    0
    ReputationRep:
    I have read that hydrogen bonds form between polar R-groups and ionic bonds form between charged R-groups on an amino acids, forming the tertiary structure of the protein.
    But what is the difference between a polar/charged R-group? When will a hydrogen bond form & when will an ionic bond form?
    Offline

    3
    ReputationRep:
    Hydrogen bonds are generally between a hydrogen atom and an atom of nitrogen, oxygen, fluorine or chlorine. An example of a hydrogen bond would be between the hydrogen of one water molecule and the oxygen of another molecule. Hydrogen bonds arise because of the difference in electronegativity between the hydrogen (not very electronegative) and the other atom (which is very electronegative). The more electronegative atom, e.g. the oxygen in water, attracts electrons more strongly, so is described as being slightly negative (you will see this represented as δ-) and the hydrogen is slightly positive (δ+). Hydrogen bonds would lead to a polar bond, because of the partial charges.

    Ionic bonds only form between ions, e.g. Cl- and Na+. As opposed to the slightly negative charges (polarity) seen in hydrogen bonds, the ions in ionic bonds have an actual charge because they have lost or gained electrons. Ionic bonds result in a charged R-group because there are charged particles (ions) involved.

    Remember: charged means there is a full charge, e.g. Na+, and polar means the is only a partial charge, e.g. H δ+.

    Hope this helps!
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

Sponsored content:

HEAR

HEAR

Find out how a Higher Education Achievement Report can help you prove your achievements.

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.