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bio 1108 exam 3 Questions & answers
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bio 1108 exam 3The hydrolytic digestion of which of the following should produce monomers that are
aminated (i.e., have an amine group attached) molecules of β-glucose?
A) insect exoskeleton
B) plant cell walls
C) fungal cell walls
D) Three of these responses are correct.
E) Two of these responses are correct. - ANS-Two of these responses are correct.
If all fungi in an environment that perform decomposition were to suddenly die, then
which group of organisms should benefit most, due to the fact that their fungal
competitors have been removed?
A) plants
B) protists
C) prokaryotes
D) animals
E) mutualistic fungi - ANS-prokaryotes
When a mycelium infiltrates an unexploited source of dead organic matter, what are
most likely to appear within the food source soon thereafter?
A) fungal haustoria
B) soredia
C) fungal enzymes
D) increased oxygen levels
E) larger bacterial populations - ANS-fungal enzymes
Which of the following is a characteristic of hyphate fungi (fungi featuring hyphae)?
A) They acquire their nutrients by phagocytosis.
B) Their body plan is a unicellular sphere.
C) Their cell walls consist mainly of cellulose microfibrils.
D) They are adapted for rapid directional growth to new food sources.
E) They reproduce asexually by a process known as budding. - ANS-They are adapted
for rapid directional growth to new food sources.
The functional significance of porous septa in certain fungal hyphae is most similar to
that represented by which pair of structures in animal cells and plant cells, respectively?
,A) desmosomestonoplasts
B) gap junctionsplasmodesmata
C) tight junctionsplastids
D) centriolesplastids
E) flagellacentral vacuoles - ANS-gap junctionsplasmodesmata
What do fungi and arthropods have in common?
A) Both groups are commonly coenocytic.
B) The haploid state is dominant in both groups.
C) Both groups are predominantly heterotrophs that ingest their food.
D) The protective coats of both groups are made of chitin.
E) Both groups have cell walls. - ANS-The protective coats of both groups are made of
chitin.
In septate fungi, what structures allow cytoplasmic streaming to distribute needed
nutrients, synthesized compounds, and organelles throughout the hyphae?
A) multiple chitinous layers in cross-walls
B) pores in cross-walls
C) complex microtubular cytoskeletons
D) two nuclei
E) tight junctions that form in cross-walls between cells - ANS-pores in cross-walls
What accounts most directly for the extremely fast growth of a fungal mycelium?
A) rapid distribution of synthesized proteins by cytoplasmic streaming
B) a long tubular body shape
C) the readily available nutrients from their ingestive mode of nutrition
D) a dikaryotic condition that supplies greater amounts of proteins and nutrients -
ANS-rapid distribution of synthesized proteins by cytoplasmic streaming
The vegetative (nutritionally active) bodies of most fungi are
A) composed of hyphae.
B) referred to as a mycelium.
C) usually underground.
D) Three of these responses are correct.
E) Two of these responses are correct. - ANS-Three of these responses are correct.
Both fungus-farming ants and their fungi can synthesize the same structural
polysaccharide from the β-glucose. What is this polysaccharide?
A) amylopectin
B) chitin
,C) cellulose
D) lignin
E) glycogen - ANS-chitin
Consider two hyphae having equal dimensions: one from a septate species and the
other from a coenocytic species. Compared with the septate species, the coenocytic
species should have
A) fewer nuclei.
B) more pores.
C) less chitin.
D) less cytoplasm.
E) reduced cytoplasmic streaming. - ANS-less chitin
Immediately after karyogamy occurs, which term applies?
A) plasmogamy
B) heterokaryotic
C) dikaryotic
D) diploid - ANS-diploid
Which description does not apply equally well to both sexual and asexual spores?
A) have haploid nuclei
B) represent the dispersal stage
C) are produced by meiosis
D) upon germination, will subsequently undergo S phase and mitosis - ANS-are
produced by meiosis
Plasmogamy can directly result in which of the following?
1. cells with a single haploid nucleus
2. heterokaryotic cells
3. dikaryotic cells
4. cells with two diploid nuclei
A) 1 or 2
B) 1 or 3
C) 2 or 3
D) 2 or 4
E) 3 or 4 - ANS-2 or 3
After cytokinesis occurs in budding yeasts, the daughter cell has a
, A) smaller nucleus and more cytoplasm than the mother cell.
B) smaller nucleus and less cytoplasm than the mother cell.
C) larger nucleus and less cytoplasm than the mother cell.
D) similar nucleus and less cytoplasm than the mother cell. - ANS-similar nucleus and
less cytoplasm than the mother cell.
In most fungi, karyogamy does not immediately follow plasmogamy, which consequently
A) means that sexual reproduction can occur in specialized structures.
B) results in multiple diploid nuclei per cell.
C) allows fungi to reproduce asexually most of the time.
D) results in heterokaryotic or dikaryotic cells.
E) is strong support for the claim that fungi are not truly eukaryotic. - ANS-results in
heterokaryotic or dikaryotic cells.
If all of their nuclei are equally active transcriptionally, then the cells of both dikaryotic
and heterokaryotic fungi, in terms of the gene products they can make, are essentially
A) haploid.
B) diploid.
C) alloploid.
D) completely homozygous.
E) completely hemizygous. - ANS-diploid
Which process occurs in fungi and has the opposite effect on a cell's chromosome
number than does meiosis I?
A) mitosis
B) plasmogamy
C) crossing over
D) binary fission
E) karyogamy - ANS-karyogamy
Which of the following statements is true of deuteromycetes?
A) They are the second of five fungal phyla to have evolved.
B) They represent the phylum in which all the fungal components of lichens are
classified.
C) They are the group of fungi that have, at present, no known sexual stage.
D) They are the group that includes molds, yeasts, and lichens.
E) They include the imperfect fungi that lack hyphae. - ANS-They are the group of fungi
that have, at present, no known sexual stage.
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