IB Biology Topic B2.2.7 Structure and Function of Free Ribosomes and of the Rough Endoplasmic Reticulum Revision Notes (HL)

IB Biology Topic B2.2.7 Structure and Function of Free Ribosomes and of the Rough Endoplasmic Reticulum Revision Notes (HL) | RevisionDojo

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Ribosomes: The Protein Synthesis Machinery

A ribosome is a complex of ribosomal RNA (rRNA) and proteins that catalyses translation, the synthesis of polypeptides from an mRNA template.
1. The small subunit binds mRNA and ensures correct codon-anticodon matching.
2. The large subunit catalyses peptide bond formation and provides an exit tunnel for the growing polypeptide chain.
Eukaryotic ribosomes are 80S (a 40S small subunit and a 60S large subunit), while prokaryotic ribosomes are 70S.
1. Ribosomes are not permanently free or bound: the same ribosome can be free in one round of translation and bound in the next.
2. What determines where it ends up is the protein it is making.

Free Ribosomes: Proteins for Internal Use

Free ribosomes float in the cytoplasm, unattached to any membrane.

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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.

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Ribosomes: The Protein Synthesis Machinery

A ribosome is a complex of ribosomal RNA (rRNA) and proteins that catalyses translation, the synthesis of polypeptides from an mRNA template.
1. The small subunit binds mRNA and ensures correct codon-anticodon matching.
2. The large subunit catalyses peptide bond formation and provides an exit tunnel for the growing polypeptide chain.
Eukaryotic ribosomes are 80S (a 40S small subunit and a 60S large subunit), while prokaryotic ribosomes are 70S.
1. Ribosomes are not permanently free or bound: the same ribosome can be free in one round of translation and bound in the next.
2. What determines where it ends up is the protein it is making.

Free Ribosomes: Proteins for Internal Use

Free ribosomes float in the cytoplasm, unattached to any membrane.

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 B2.2.7: Structure and Function of Free Ribosomes and of the Rough Endoplasmic Reticulum Notes

Ribosomes: The Protein Synthesis Machinery

Free Ribosomes: Proteins for Internal Use

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

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Ribosomes: The Protein Synthesis Machinery

Free Ribosomes: Proteins for Internal Use

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

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics