IB Biology Topic A2.3.1 Structural Features Common to Viruses Revision Notes (HL)

IB Biology Topic A2.3.1 Structural Features Common to Viruses Revision Notes (HL) | RevisionDojo

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Virus Structure: What Makes Viruses Different from Cells

Definition

Virus

A virus is a non-cellular particle composed of genetic material (DNA or RNA) enclosed in a protein coat called a capsid.

A virus is a non-cellular particle composed of genetic material (DNA or RNA) enclosed in a protein coat (capsid).
Viruses lack the structures and processes for independent life and can only reproduce by infecting a host cell.
They are obligate intracellular parasites, depending entirely on host cells to replicate.

Core Features: Five Traits All Viruses Share

Small and Fixed Size:
Viruses range from 20 to 300 nanometers, much smaller than bacteria and cells.
Their small size allows them to invade host cells and evade immune defenses.
Viruses do not grow after assembly, and their size is set by capsid protein arrangement.

Hint

Viruses are assembled inside host cells, much like a car is built in a factory.
They do not grow or develop like living organisms.

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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

Virus Structure: What Makes Viruses Different from Cells

Definition

Virus

A virus is a non-cellular particle composed of genetic material (DNA or RNA) enclosed in a protein coat called a capsid.

A virus is a non-cellular particle composed of genetic material (DNA or RNA) enclosed in a protein coat (capsid).
Viruses lack the structures and processes for independent life and can only reproduce by infecting a host cell.
They are obligate intracellular parasites, depending entirely on host cells to replicate.

Core Features: Five Traits All Viruses Share

Small and Fixed Size:
Viruses range from 20 to 300 nanometers, much smaller than bacteria and cells.
Their small size allows them to invade host cells and evade immune defenses.
Viruses do not grow after assembly, and their size is set by capsid protein arrangement.

Hint

Viruses are assembled inside host cells, much like a car is built in a factory.
They do not grow or develop like living organisms.

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 A2.3.1: Structural Features Common to Viruses Notes

Virus Structure: What Makes Viruses Different from Cells

Core Features: Five Traits All Viruses Share

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

Virus Structure: What Makes Viruses Different from Cells

Core Features: Five Traits All Viruses Share

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