IV-C: Eukaryotes Flashcards
feeding and growing stage
tropozoite
multiple fission
schizogomy
haploid sex cells
Gametes (gametocytes)
protective capsule, it permits the
organisms to survive when food, moisture, or
oxygen are lacking, when temperatures are not
suitable, or when toxic chemicals are present.
Cysts
Reproductive structure in which new cells are produced asexually
Oocyst
Two Chlorophyll containing groups
Dinoflagellates and euglenoids
protective covering of Protozoa
Pellicle
mouth-like opening
Cytostome
lack mitochondria and have flagella
Trichomonas and Giardia
single-celled eukaryotes with a feeding groove in the cytoskeleton
Archaezoa
parasite found in the small intestine of humans and other mammals
Giardia intestinalis or G. lamblia/ G. duodenalis
an alga that infects potato crops
Phytophthora infestans
well over 1 million people died
or were displaced because
of the devastating effects
of Phytophthora infestans,
an alga that infects potato
crops
Great Irish
Famine of the mid–
nineteenth century
kills 1 million people, mostly children, annually
Malaria
60 million are infected
Trypanosoma cruzi
belong to several super clades and can reproduce both
sexually and asexually. They are photoautotrophs and produce several different photosynthetic pigments.
Algae
Most are chemoheterotrophic, but a few are
photoautotrophic. They obtain
nutrients by absorption or
ingestion. All are unicellular, and
many are motile. Parasitic
protozoans often form resistant
cysts.
Protozoa
chemoheterotrophs and
acquire food by absorption. With
the exception of yeasts, fungi are
multicellular. Most reproduce with
sexual and asexual spores
Fungi
multicellular animals. They are
chemoheterotrophs. Most obtain
nutrients by ingestion through the
mouth; some are absorptive.
Helminths
are animals with jointed legs. The arthropods that
transmit diseases are important in
microbiology. These include ticks,
and some insects; most often,
members of the mosquito family
are responsible for transmitting
disease
Arthropods
Fungi, protozoa, and
arthropods cause diseases
in humans. Most of these
diseases are diagnosed by
microscopic examination.
Like bacteria, fungi are
cultured on laboratory
media. TRUE OR FALSE
FALSE
Infections caused by
eukaryotes are difficult to
treat because humans
have eukaryotic cells. TRUE OR FALSE.
TRUE
Algal diseases of humans
are infectious; they are
intoxications because the
symptoms result from
ingesting algal toxins. TRUE OR FALSE.
FALSE
Arthropods that transmit
infectious diseases are
called a vector. Arthropod-borne diseases such as
West Nile encephalitis is
best controlled by limiting
exposure to arthropods. TRUE OR FALSE.
TRUE
aerobic or
facultatively anaerobic;
only a few anaerobic fungi
are known.
Fungi
Symbiotic fungi that help the roots absorb minerals and water from the soil
Mycorrhizae
Study of fungi
Mycology
cross walls which divide them into distinct, uninucleate cell-like units
septa
distinct, uninucleate cell-like units
septate hyphae
hyphae contain no septa
and appear as long,
continuous cell with many
nuclei
Coenocytic hyphae
grow by elongating at the tips
Hyphae
the portion of a hypha that
obtains nutrients.
Vegetative hypha
The portion
concerned with
reproduction, bear
reproductive spores
Reproductive or aerial hypha
a filamentous
mass of hyphae
Mycelium
Nonfilamentous,
unicellular fungi, spherical
or oval
Yeasts
capable of
facultative anaerobic
growth, which allows these
fungi to survive in various
environment.
Yeasts
divide asymmetrically
Budding yeasts
divide unevenly
Saccharomyces
short chain of cells from undetached yeast buds
Pseudohypha
attaches to human
epithelial cells as a yeast,
requires pseudohyphae to
invade deeper tissues
Candida albicans
divide symmetrically
Fission yeasts
divide evenly to produce two new cells
Schizosaccharomyces
produce vegetative and aerial hyphae
Moldlike growth
reproduce by budding
Yeastlike growth
yeastlike at 37 degrees Celcius and moldlike at 25 degrees Celcius
Pathogenic dimorphic fungi
Dimorphism in the fungus depends on CO2 concentration
Mucor indicus
can reproduce asexually by
fragmentation of their
hyphae
Filamentous fungi
are formed by the hyphae of
one organism. When these
spores germinate, they
become organisms that are
genetically identical to the
parent
Asexual spores
result from the fusion of nuclei from
two opposite mating
strains of the same species
of fungus
Sexual spores
unicellular or multicellular
spore that is not enclosed
in a sac
Conidia (conidium) or conidiospores
formed by
the fragmentation of a
septate hypha into single,
slightly thickened cells.
Arthroconidia
another
type of conidium, are
formed from the buds of
its parent cell.
Blastoconidia
Blastoconidia are found in some yeasts, such as
Candida albicans and Cryptococcus
species that produces Arthroconidia
Coccidioides immitis
thick-walled spore formed by
rounding and enlargement
within a hyphal segment.
Chlamydoconidia
fungus that produces chlamydoconidia
Candida albicans
formed within a
sporangium, or sac, at the
end of an aerial hypha
Sporangiopore
Sporangium are produced by
Rhizopus
Three phases of sexual reproduction of fungi
Plasmogamy, Karyogamy, Meiosis
Haploid donor cell nucleus (+)
penetrates cytoplasm of
recipient cell (–)
Plasmogamy
+ and – nuclei
fuse to form a diploid
zygote nucleus
Karyogamy
Diploid nucleus
produces haploid nuclei
(sexual spores), some of
which may be genetic
recombinant
Meiosis
a sporangium in which
zygospores are produced.
Zygosporangium
is the capsule structure belonging to
many plants and fungi, in
which the reproductive
spores are produced and
stored
Sporangium
fusion of haploid cells produces one
zygospore; the thick-walled resting cell of
certain fungi and algae,
arising from the fusion of
two similar gametes;
sexual spores of
zygomycetes
Zygospore
formed in a sac. A sexually produced fungal
spore formed within an
ascus of ascomycetes
Ascospore
formed
externally on a pedestal
Basidiospore
a clublike structure with 2-4 apical
sterigmata that bear
basidiospores.
Basidium
Medically important Phyla of Fungi
Zygomycota, Microsporidia, Ascomycota, Basidiomycota, Anamorphs
conjugation
of fungi, are saprophytic
molds that have
coenocytic hyphae
Zygomycota
the common black bread mold
Rhizopus mucor stolonifera
Are unusual eukaryotes
because they lack
mitochondria. Cause chronic diarrhea and
keratoconjunctivitis in
AIDS patients
Microsporidia
in 1857, when they were
discovered,
microsporidians were
classified as fungi. They
were reclassified as
protists in
1983
include molds
with septate hyphae and
some yeasts
Sac fungi
produced in long chains
from the conidiophore produced in a saclike
conidia
opportunistic, systematic mycosis
Aspergillus
systematic mycosis
Blastomyces dermatitidis,
Histoplasma capsulatum
cutaneous mycoses
Microsporum, Trichophyton
also possess
septate hyphae.
club fungi
are formed
externally on a base
pedestal called a basidium
Basidiospores