IB Biology Topic D1.1.6 Directionality of DNA Polymerases Revision Notes (HL)

IB Biology Topic D1.1.6 Directionality of DNA Polymerases Revision Notes (HL) | RevisionDojo

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DNA Polymerases Work in Only One Direction

Reading a book upside down and backward would be confusing and hard.
DNA polymerases face a similar limit during replication: they can work in only one direction.

Tip

DNA polymerases always add nucleotides to the 3' end of a growing DNA strand.

The 5' and 3' Ends of DNA

DNA strands have a direction, set by the structure of their nucleotides.

Nucleotide Structure

Each nucleotide has three parts:
1. A phosphate group.
2. A sugar (deoxyribose in DNA).
3. A nitrogenous base (adenine, thymine, cytosine, or guanine).

Note

The sugar has carbon atoms numbered 1' to 5'.
These numbers define the direction of the DNA strand.

The 5' and 3' Ends

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DNA Polymerases Work in Only One Direction

Reading a book upside down and backward would be confusing and hard.
DNA polymerases face a similar limit during replication: they can work in only one direction.

Tip

DNA polymerases always add nucleotides to the 3' end of a growing DNA strand.

The 5' and 3' Ends of DNA

DNA strands have a direction, set by the structure of their nucleotides.

Nucleotide Structure

Each nucleotide has three parts:
1. A phosphate group.
2. A sugar (deoxyribose in DNA).
3. A nitrogenous base (adenine, thymine, cytosine, or guanine).

Note

The sugar has carbon atoms numbered 1' to 5'.
These numbers define the direction of the DNA strand.

The 5' and 3' Ends

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.
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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D1.1.6: Directionality of DNA Polymerases Notes

DNA Polymerases Work in Only One Direction

The 5' and 3' Ends of DNA

Nucleotide Structure

The 5' and 3' Ends

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DNA Polymerases Work in Only One Direction

The 5' and 3' Ends of DNA

Nucleotide Structure

The 5' and 3' Ends

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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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics