Eating habits - 5th set Flashcards

1
Q

fungi

A

They are heterotrophs and saprophytes; some are parasites Cell wall made of chitin (target for antifungal agents) is present.

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2
Q

Fungi prefers to grow..

A

in acidic pH ( 5 or lower ) with high salt and sugar in slight moist environment and relative humidity of 70 % or more

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3
Q

fungi have a filamentous…

A

body (mycelium); individual filament is called hypha (plural - hyphae)

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4
Q

The hyphae are well adapted to..(eating - sick - kitchen table)

A

absorb food –high surface to volume ratio –releases enzymes to breakdown food; also acts as a repellant

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5
Q

Vegetative hyphae

A

segment of hyphae which obtains nutrition

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6
Q

Aerial hyphae

A

projects above the surface; bears reproductive spores

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7
Q

Specialized hyphae includes

A

haustoria and rhizoids

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8
Q

Dimorphic fungi can grow as…

A

yeast like ( unicellular ) or as mycelia

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9
Q

2 classes of hyphae

A

depending on the presence of septa ( cross wall ) In some, individual cells are separated from one another by septa (septate hyphae vs coenocytic hyphae )

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10
Q

All fungi have lysosomes

A

-digest damaged cells -helps parasitic fungi to invade host

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11
Q

Fungi have unusual reproductive modes

A

Sexual as well as Asexual produces spores. Asexual or sexual spores germinates, develop into new hyphae and mycelium

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12
Q

antifungal drugs target

A

Affects / targets membrane component

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13
Q

Azoles

A

includes Clotrimazole, Miconazole, Fluconazole FYI -inhibits ergosterol synthesis ; interfere in the synthetic pathway-active component of medications (over the counter) to treat localized, superficial yeast infection

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14
Q

Antifungals that target cell division (grease - couch)

A

Gresiofulvin (synthesized by some fungi)-exact mechanism, unknown-thought to interfere with spindle fibers component microtubules during polymerization/depolarmerization; blocks mitotic events used for nail and skin fungal infection treatment.

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15
Q

Antifungal - Nucleic acid synthesis (kitchen counter - cite-o-sine)

A

poor target. Flucytosine: taken by yeast cell’s permease and converted into active, inhibitory form, 5 fluorouracil ( inhibits nucleic acid synthesis )

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16
Q

hetro means…

A

different carbon and energy sources.

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17
Q

facultative anaerobes (flex) and ex.

A

flexible in their oxygen requirement. ex. - yeast (candida)

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18
Q

sabarouds fungi medium

A

high salt and sugar, and acid ph unique.

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19
Q

hyphae…(1)

A

1 filament from hairlike fungi body

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20
Q

hyphae are…(noe)

A

one hyphae close by will release repellants will signal other hyphae to move to different area for nutrients.

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21
Q

part of hyphae on top of and under bread..

A

bread, called arial hyphae. usually has reproductive cells. part under, in bread - called vegetative hyphae

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22
Q

parasitic

A

grows on sikin called haustoria, they are gentle in their actions. others are rhizoids, feeds off dead organic matter, much more aggressive.

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23
Q

fungi are…(missed question)

A

natural decomposers, act upon dead organic matter and recycle most elements to the atmosphere or environ.

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24
Q

most that infect us are…(diana)

A

dimorphic. oval shaped. dimporphic that grow on us - that means morphology is based on temperature (environment).
when outside they have one form, but inside body have a different form.

25
Q

in coenocytic hyphae, no…

A

no septa and cells are multinucleated

26
Q

food moves to all…

A

all cells in fungal body

27
Q

most that infect us are…

A

diamoprhic

28
Q

cellular resources are (nose)

A

nutrients to septae

29
Q

point of growth are…

A

tops of cells of ariel hyphe

30
Q

fungi secretes…

A

keratinase to help it go deeper into the host.

31
Q

reproduction is…(always)

A

sexual as well as asexual - always produce spores.

32
Q

difference btwn bacteria

A

fungal spores can be destroyed by heat, and 2) fungal spore is mainly for multiplication, but bacterial spore is not for multiplication

33
Q

mycelium

A

has male and female hyphae

34
Q

hetrokaryotic (sexual reprod) (skeleton corner)

A

also called dikaryon - when there are 2 nucleus within a cell. it can undergo reproduction a few times by itself.

35
Q

zygote (sexual reprod)

A

zygospore, 2N chromosome. will get transformed into spore producing structure called fruiting bodies.

36
Q

meiosis (#) (sexual reprod)

A

becomes N # of chromosome

37
Q

conidium and sporangium

A

fruiting bodies. will release spore and germinate, blown by wind or inhaled. germinate then cause fungal infection. specifically sexual repro.

38
Q

asexual makes..

A

spore producing structure

39
Q

fungal plasma membrane has (membrane - bedroom)

A

sterols like other eukaryotic cells, besides phospholipids and proteins. most bacteria do not have cholesterol or sterol, but cell wall instead. sterol is called ergosterol.

40
Q

antifungal drugs targets (same)

A

membrane component = erogosterol of fungi membrane

41
Q

azoles

A

superficial yeast infection or fungal

42
Q

fungal cell wall is (glue)

A

fungal cell wall is chitin, it is made up of sugar. glucan sythase are involved in chitin synthesis.

43
Q

aspergillosis

A

lung infection

44
Q

Gresiofulvin (grease 2) - no oral…

A

because stomach epithelial are constantly turning over. no IV, the bone marrow blood cells have limited life span and cont. turnover of blood cells

45
Q

fluorouracil (kitchen floor)

A

stops DNA sythesis, only effective for yeast. incorporated into DNA.

46
Q

Azole blocks..

A

ergosterol, which is needed for stability of cell membrane.

47
Q

majority of fungi are…(ana - lamp)

A

aerobes or facultative anaerobes (can switch to fermentation if O2 is absent) ( Ex. yeast) –few are obligate anaerobes - found in cattle’s and deer’s intestine

48
Q

Haustoria (opposite)

A

are associated with parasitic fungi

49
Q

Rhizoids are…

A

are associated with saprophytic fungi

50
Q

septa have (fingers)

A

microscopic openings -mobilizes cellular resources right to the point of growth

51
Q

septate hyphae (x)

A

cross wall

52
Q

coenocytic hyphae (many co-ed)

A

no septa - cells are multinucleated

53
Q

anti-fungal drugs - Polyenes (poly w/ nya - cat tree)

A

includes Amphotericin and Nystatin-binds to ergosterol component ; forms pores results in leaky membrane -very toxic; limited use in life threatening conditions

54
Q

Saprophytes feed off…

A

of dead cells.

55
Q

dikaryon stage (skelton bedroom)

A

nucleus fuses - 2N. Fruiting bodies that contain spores. break apart and spores are released

56
Q

Echinocandins - antifungal

A

used for Candida and Aspergillosis treatment-interferes with fungal cell wall synthesis inhibiting glucan synthase - involved in chitin synthesis. when chitin is compromised, there is no cell wall.

57
Q

trophs means

A

nutrients. Fungi use carbon from sugar, amino acids.

58
Q

human pathogenic fungi are

A

dimorphic ( thermally dimorphic)

59
Q

obligate anaerobes

A

can’t tolerate atmospheric oxygen