biodiversity, cell specialisation and evolution Flashcards

1
Q

what are the 4 types of eukaryotes

A

animals, plants, fungi, protists

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2
Q

what are the 2 types of prokaryote

A

bacteria and archaea

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3
Q

what are the main differences between prokaryotes and eukaryotes

A

P - smaller
E - larger
P - no nucleus, free floating DNA
E - membrane bound nucleus
P - high replication

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4
Q

what does biodiversity mean

A

the variety of life and how diverse it is

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5
Q

define a species

A

a group of related organisms capable of interbreeding to produce viable offspring

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6
Q

define population

A

a group of individuals of the same species living in a particular geographic area

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7
Q

define community

A

all individual organisms belonging to all of the species which live in a particular geographic area

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8
Q

define community

A

all of the abiotic factors and the entire community of species which co-exist in a certain area

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9
Q

what are extremophiles

A

microorganisms living in extreme conditions such as extreme heat. And cannot live without these extremes

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10
Q

bacteria are ubiquitous. What does this mean?

A

they’re found everywhere

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11
Q

what is the temperature range for psychrophiles

A

optimum = 0
max = 15

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12
Q

what is the temperature range of psychrotrophs

A

20-40

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13
Q

what is the temperature range of mesophiles

A

37-40 (within the body)

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14
Q

what is the temperature range for thermophiles

A

60-80

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15
Q

what’s an example of a psychrophile

A

polarmonas vacuolata

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16
Q

what’s an example of a mesophile

A

eschericha coli

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17
Q

what’s an example of a thermophile

A

baclius stearothermophilius

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18
Q

what is the pH range for acidophiles

A

below 7 (acidic)
optimum 3

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19
Q

what is the pH range for neutrophiles

A

optimum is 7
around 6-9

20
Q

what is the pH range for alkaliphiles

A

above 7
optimum 9.5

21
Q

what are the conditions needed for a halophile

A

needs NaCl to grow

22
Q

what are the conditions needed for a halotolerant

A

optimum is no NaCl but can grow a little in its presence

23
Q

what is the optimum salt concentration for a mild halophile

24
Q

what is the optimum salt concentration for a moderate halophile

A

6-15% NaCl

25
what is the optimum salt concentration for a extreme halophile
15-30% NaCl
26
what are the oxygen requirements for obligate aerobes
needs oxygen for growth
27
what are the oxygen requirements for facultative anaerobes
can switch between requiring and not requiring oxygen. Uses anaerobic respiration
28
what are the oxygen requirements for microaerophiles
require specific reduced levels of oxygen
29
what are the oxygen requirements for aerotolerant anaerobes
oxygen sensitive, grow equally well with or without oxygen. Uses fermentation metabolism
30
what are the oxygen requirements for obligate anaerobes
oxygen is toxic, doesn't need oxygen to grow
31
what is bacterial redundancy
where multiple bacteria can perform the same role in the same environment
32
how can redundancy be helpful to other organisms
helpful in our microbiome, if we have more than one commensal organism, so if one is reduced it can take up its role so no harm is done
33
how can redundancy be bad for the environment
it can lead to one of the bacteria's no longer being needed leaving a gap in the ecosystem, possibly causing further divergence due to selection pressures caused by the change
34
what is a microbiome
all of the genetic material of all the microorganisms in one specific environment or location at one time
35
what do the microbes in the oral cavity do
they aim to avoid build up and flush potential pathogens
36
what is dysbiosis
a diversion from the normal such as a change in the amount of a specific bacteria in a microbiome
37
what is the role of the microbiome in the gastrointestinal tract
break down digested products - bacteria must be able to survive in highly acidic conditions - its impacted by diet and lifestyle
38
what does dysbiosis of the GI tract cause
inflammation, toxicity and disease
39
what is the role of the microbiome in the skin
its a defence mechanism and triggers an immune response - constantly varied across different surfaces and time
40
what does the dysbiosis of the skin microbiome lead to
psoriasis, dermatitis, and eczema
41
what is the role of the microbiome in the reproductive tract
role in maintaining acidic pH
42
what does dysbiosis of the reproductive tracts microbiome cause
pelvic inflammatory disorder, endometriosis, toxic shock syndrome and infertility
43
what elements of diversity do muscle cells contain in comparison to other cells
increased frequency of mitochondria for energy - high endoplasmic reticulum for greater protein synthesis
44
what is keratinisation
45
what is serial endosymbiosis
cells integrate into prokaryotes by engulfment and retain functional capacity
46