IB Biology Topic C3.2.1 Pathogens as the Cause of Infectious Diseases Revision Notes (SL/HL)

IB Biology Topic C3.2.1 Pathogens as the Cause of Infectious Diseases Revision Notes (SL/HL) | RevisionDojo

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Pathogens Are the Microorganisms That Cause Infectious Disease

Before pathogens were discovered, people blamed illness on bad air or curses.

We now know that many diseases are caused by microorganisms that invade the body.
An infectious disease is one caused by a pathogen and can be passed from one organism to another.
A non-infectious disease, such as diabetes or scurvy, has no pathogen and cannot spread between people.

Definition

Disease

A disease is a disruption to the normal function or structure of the body, often caused by harmful microorganisms.

A Pathogen Is Any Organism or Agent That Causes Disease

Definition

Pathogen

Pathogen refers to any organism or agent capable of causing disease.

A pathogen is a microorganism or agent that causes disease.
Pathogens can be bacteria, viruses, fungi, protists, or abnormal proteins called prions.
They cause a wide range of illnesses, from the common cold to life-threatening diseases like Ebola.

Note

Archaea are another group of microorganisms.
They are not known to cause disease in humans.

Different Types of Pathogen Cause Different Diseases

Bacteria are single-celled organisms that survive in many environments.
1. Most are harmless or helpful, but some are pathogenic.
2. They cause tuberculosis, cholera, and strep throat.
Viruses are genetic material, DNA or RNA, inside a protein coat.

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Excepteur sint occaecat cupidatat non proident

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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.

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Pathogens Are the Microorganisms That Cause Infectious Disease

Before pathogens were discovered, people blamed illness on bad air or curses.

We now know that many diseases are caused by microorganisms that invade the body.
An infectious disease is one caused by a pathogen and can be passed from one organism to another.
A non-infectious disease, such as diabetes or scurvy, has no pathogen and cannot spread between people.

Definition

Disease

A disease is a disruption to the normal function or structure of the body, often caused by harmful microorganisms.

A Pathogen Is Any Organism or Agent That Causes Disease

Definition

Pathogen

Pathogen refers to any organism or agent capable of causing disease.

A pathogen is a microorganism or agent that causes disease.
Pathogens can be bacteria, viruses, fungi, protists, or abnormal proteins called prions.
They cause a wide range of illnesses, from the common cold to life-threatening diseases like Ebola.

Note

Archaea are another group of microorganisms.
They are not known to cause disease in humans.

Different Types of Pathogen Cause Different Diseases

Bacteria are single-celled organisms that survive in many environments.
1. Most are harmless or helpful, but some are pathogenic.
2. They cause tuberculosis, cholera, and strep throat.
Viruses are genetic material, DNA or RNA, inside a protein coat.

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 C3.2.1: Pathogens as the Cause of Infectious Diseases Notes

Pathogens Are the Microorganisms That Cause Infectious Disease

A Pathogen Is Any Organism or Agent That Causes Disease

Different Types of Pathogen Cause Different Diseases

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

Pathogens Are the Microorganisms That Cause Infectious Disease

A Pathogen Is Any Organism or Agent That Causes Disease

Different Types of Pathogen Cause Different Diseases

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