4.1 Disease & Plant Defences Flashcards Preview

A Level Biology > 4.1 Disease & Plant Defences > Flashcards

Flashcards in 4.1 Disease & Plant Defences Deck (12):
1

What is a disease?

Abnormal condition of an organism impairing its function accompanied by symptoms

2

In what ways can disease be classified?

Timescale
Causes
Infectious or not
Inherited

3

Timescale - what is acute and what is chronic?

Acute - develops quickly e.g angina
Chronic - develops slowly e.g. Chronic bronchitis

4

Causes - disease can be single causal or multi factural give examples of each:

Single - caused by a single mutated gene e.g. Sickle cell anaemia
Multi - genetic and environmental causes E.g. Cardiovascular disease

5

Give examples of infectious and non infectious diseases:

Infectious e.g. HIV
Non e.g. Lung cancer

6

What is a pathogen?

Disease causing organism

7

Pathogens can damage cells e.g. How do malarial parasites work?

By bursting rbc's

8

Some pathogens produce toxins - what is the difference between exotoxins and endotoxins?

Exo - secreted by living pathogen
Endo - released when pathogen is damaged

9

Cell damage - viruses take over what?

Cell metabolism

10

Cell damage - some protoctists take over cells and do what?

Break them open as they produce a new generation

11

Cell damage - fungi digest living cells doing what?

Destroying them

12

Bacteria produce toxins that damage cells by doing what?

Breaking down membranes
Inactivating enzymes
Interfering with hosts genetic material

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