IB Biology Topic A1.2.1 DNA as the Genetic Material of All Living Organisms Revision Notes (SL/HL)

IB Biology Topic A1.2.1 DNA as the Genetic Material of All Living Organisms Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

DNA Is the Hereditary Molecule of All Living Organisms

Every living organism uses DNA (deoxyribonucleic acid) as its genetic material.
DNA carries the instructions needed to build and maintain an organism, passed from parent to offspring.
In eukaryotes, DNA is packed inside the nucleus as chromosomes.
Smaller, separate DNA molecules also exist in mitochondria (mtDNA) and, in plants and algae, in chloroplasts (cpDNA).

Definition

DNA (Deoxyribonucleic Acid)

A double-stranded molecule that stores and transmits genetic information in living organisms.

Note

The presence of DNA in mitochondria and chloroplasts supports the endosymbiotic theory.
These organelles were likely once free-living prokaryotes that were engulfed by an ancestral eukaryotic cell.

In Prokaryotes, DNA Sits Free in the Cytoplasm

In prokaryotes (bacteria and archaea), DNA exists as a single circular chromosome in the nucleoid region of the cytoplasm.

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

DNA Is the Hereditary Molecule of All Living Organisms

Every living organism uses DNA (deoxyribonucleic acid) as its genetic material.
DNA carries the instructions needed to build and maintain an organism, passed from parent to offspring.
In eukaryotes, DNA is packed inside the nucleus as chromosomes.
Smaller, separate DNA molecules also exist in mitochondria (mtDNA) and, in plants and algae, in chloroplasts (cpDNA).

Definition

DNA (Deoxyribonucleic Acid)

A double-stranded molecule that stores and transmits genetic information in living organisms.

Note

The presence of DNA in mitochondria and chloroplasts supports the endosymbiotic theory.
These organelles were likely once free-living prokaryotes that were engulfed by an ancestral eukaryotic cell.

In Prokaryotes, DNA Sits Free in the Cytoplasm

In prokaryotes (bacteria and archaea), DNA exists as a single circular chromosome in the nucleoid region of the cytoplasm.

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 A1.2.1: DNA as the Genetic Material of All Living Organisms Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

DNA Is the Hereditary Molecule of All Living Organisms

In Prokaryotes, DNA Sits Free in the Cytoplasm

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

DNA Is the Hereditary Molecule of All Living Organisms

In Prokaryotes, DNA Sits Free in the Cytoplasm

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