18 Ass 9 pt 2 Disease Flashcards

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1
Q

Explain what is meant by the term transmissible.

A

A pathogen passed on from an infected host to a non-infected host that can cause illness/disease

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2
Q

What can cause outbreaks of cholera? 5

A

poverty, war, natural disasters, poor sanitation, lack of available treatments

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3
Q

How can poverty cause cholera outbreaks 3

A

Poor sanitation

lack of access to clean water or sewage systems

lack of access to treatments

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4
Q

How can war cause cholera outbreaks?

A

It destroys infrastructure

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5
Q

How can natural disasters cause cholera

A

destroys infrastructure and can cause poverty

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6
Q

Q 22 b see fig and answer q line is 31 mm

A

A=I/M
I= 31 mm = 31000um
M=21000

A=31000/21000
= 1.47619…
= 1.5 um

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7
Q

What are the features of prokaryotic cells? 7

A

Unicellular

1-5 um, smaller than eukaryotes

no membrane bound organelles

no nucleus,

free floating circular DNA plasmids & a chromosome

Smaller ribosomes, 70s

cell surface membrane & cell wall

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8
Q

What are the features of eukaryotes? 6

A

Unicellular or multicellular

10-100um, bigger than prokaryotes

membrane bound organelles

Membrane-bound nucleus

80s ribosomes, bigger than prokaryotes

cell surface membrane & cell wall

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9
Q

Q22 d Read context & see fig

A student used the data in fig 4.2 to predict that measures to control the spread of HIV will decrease the number of deaths from TB.

Discuss whether the data in fig 4.2 supports this 4

A

Doesn’t support

there’s a larger proportion of TB deaths without HIV/AIDS than with HIV/AIDS

There are also other factors than HIV/AIDS that increase the chances of dying from TB

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10
Q

How does a low number of T-helper cells make it more likely that untreated ppl infected with HIV will die if they also get TB? 4

A

When the number of T-helper cells is low, the immune system can’t fight against pathogens as effectively,

leading to opportunistic infections taking over.

This is because there are lower levels of cytokine produced,

so macrophages and B-lymphocyte response isn’t stimulated and fewer viruses are killed

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11
Q

Explain how malaria is transmitted 3

A

Female anopheles mosquitoes are vectors for malaria,

which is transmitted through blood

if the mosquito drinks blood from an infected host, the parasite can spread through its salivary glands when drinking from an uninfected host

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12
Q

State 3 advantages of using test strips for malaria

A

It’s quicker to diagnose

it’s easy and accessible bc it doesn’t require a trained professional

it doesn’t require expensive equipment

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13
Q

Q20 Read context & see diagram

which statement is correct?

A

N is a control disc showing bacteria R grow when antibiotic Y is not present

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14
Q

Define multiple drug resistant in bacteria

A

Bacteria have DNA with resistant genes for several different types of antibiotic

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15
Q

What’s the initial mechanism by which bacteria become resistant to antibiotics?

A

genetic mutation

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16
Q

What is the name of the bacteria that causes TB? 2

A

Mycobacterium tuberculosis in humans

Mycobacterium bovis in animals and humans

17
Q

What is a narrow spectrum antibiotic?

A

It affects specific types of bacteria

18
Q

What is a broad spectrum antibiotic?

A

it affects a wide range of bacteria

19
Q

What uses of broad spectrum antibiotics can result in antibiotic-resistant bacteria? 2

A

a broad spectrum antibiotic given to reduce effects of influenza virus

a broad spectrum antibiotic to treat Mycobacterium tuberculosis in humans

20
Q

What uses of narrow spectrum antibiotic can result in antibiotic-resistant bacteria?

A

a narrow spectrum antibiotic to treat diarrhoea and sickness in cattle