Ch. 12 Mastering Microbio – Flashcards

Which of the following statements regarding meiosis is most accurate? -Crossing over occurs during metaphase I. -Homologous (non-sister) chromatids separate during anaphase II. -Haploid cells produce diploid cells. -Meiosis has the same number of stages as mitosis. -A diploid cell produces haploid daughter cells.

The process in which the cytoplasm is divided between daughter cells is known as -coenocytosis. -meiosis. -budding. -cytokinesis. -nuclear division.

Multiple mitoses followed by a single cytokinetic event is known as -encystment. -interphase. -schizogony. -meiosis. -coenocytic division.

Merozoites are a result of -schizogony. -conjugation. -meiosis. -mitosis. -crossing over.

The fever and chills associated with malaria are due to the release of uninucleate daughter cells of Plasmodium called (merozoites/schizonts/coencytes).

What is the key difference between yeast and mold? -Yeast is a fungus, while mold is an alga. -Yeast is colonial, while mold is multicellular. -Yeast have cellulose cell walls, while mold has chitin cell walls. -Yeast is unicellular, while mold is multicellular.

You are given an unknown, pure sample of a eukaryotic organism. Which of the following tests would allow you to determine if the sample contains algae? Determine if the organism is unicellular by microscopy. If it is unicellular, it is an alga. Place the sample in a clear container filled with media containing no sugars, and leave it in a sunny window. After a few weeks, look for growth of the organism. Perform a biochemical test for the presence of chitin. Inject the organism into a lab animal. If it does not cause disease, it is an alga.

Which of the following new chemicals would NOT be effective against Giardia? a chemical that inhibits cell division a chemical that inhibits the Krebs cycle a chemical that inhibits formation of the membrane around the nucleus a chemical that inhibits the formation of cell walls

Which of the following is a protozoan stage that allows for transmission of intestinal parasites from one host to another? -kinetoplast -foraminifera -merozoite -cyst -schizont

Single-celled eukaryotes lacking a cell wall are -algae. -protozoa. -fungi. -water molds. -insects.

A single-celled eukaryote that is both photosynthetic and a chemoheterotroph is a(n) -ciliate. -dinoflagellate. -apicomplexan. -euglenid. -kinetoplastid.

Fungi and insects both use the nitrogenous polysaccharide (cellulose/chitin/silica) as a protective molecule in their outer surfaces.

The ________ is the entire interwoven mass of one multicellular fungal organism. -pseudoplasmodium -mycelium -hyphae -sporangium -conidiophore

Lichens are composed of a symbiosis of fungi and which of the following? -euglenoids or dinoflagellates -euglenoids -cyanobacteria -cyanobacteria or green algae -green algae

Which of the following is a beneficial association between the roots of a plant and a fungus? -mycorrhizae -arthroconidia -haustoria -thallus

Simple eukaryotes that carry out oxygenic photosynthesis and reproduce by means of alternation of generations are known as -arachnids. -fungi. -euglenids. -slime molds. -algae.

Algae can have different types of photosynthetic pigments that allow them to photosynthesize at various depths in water. True False

Multicellular organisms with hard exoskeletons, segmented bodies and four pairs of jointed legs in the adult stage are -insects. -lice. -arachnids. -helminths. -algae.

The only arthropod vectors that can spend their entire lifetime associated with one host are __________. -ticks -mosquitoes -lice -fleas

The classification of algae is based largely on __________. -size -photosynthetic pigments -habitat -reproductive structures

What does it mean for a cell to be haploid? The cell has two sets of chromosomes. The cell is incapable of sexual reproduction. The cell has only one set of chromosomes. The cell is a + mating type.

A dikaryon differs from a diploid cell in that the dikaryon _____. only has chromosomes from the + mating type has one nucleus with two sets of chromosomes has two separate nuclei is haploid

Which stage of sexual reproduction involves the fusion of hyphae tips from opposite mating types to produce cells with two separate nuclei? -the diploid stage -the haploid stage -Meiosis -the dikaryotic stage

Fungi exist as either unicellular yeasts or _____. -uninucleate molds -multicellular yeasts -filamentous molds -fruiting bodies

A mushroom is an example of _____, which is the reproductive organ of a mold. -a hypha -a mycelium -the male portion of a fungus -a fruiting body

If the hyphae of a fungus are septate, this means they _____. -are asexual -are haploid -lack walls separating the cells -have crosswalls separating the cells

Diploid cells undergo meiosis producing _____. -Two haploid nuclei -four haploid nuclei -two diploid nuclei -a dikaryon

Sexual reproduction often involves two haploid sex cells or gametes. A smaller, mobile, male gamete typically fuses with a larger, nonmobile, female gamete. Why are the sex cells of fungi called + and -, instead of male and female? Scientifically, + translates to male and - translates to female. A + cell has one extra chromosome and a - cell is deficient one chromosome. + cells participate in sexual reproduction, and - cells participate in asexual reproduction. The haploid sex cells of fungi are virtually indistinguishable from one another.

Why are archaea and bacteria—both collections of prokaryotic organisms—grouped into different domains while organisms like fungi and animals are in the same domain? Fungi and animals look much more similar than bacteria and archaea. Bacteria and archaea differ significantly in their intracellular organization and structure, but fungi and animals have similar intracellular structure. Bacteria and archaea differ significantly in their rRNA sequences, but fungi and animals share some rRNA characteristics. The DNA sequences of bacteria and archaea are more different than animals and fungi.

While working with a broth culture of archaea in the laboratory, you accidentally spill some of the microorganisms on yourself. Do you need to be concerned about developing an infection? Why or why not? No; archaea are not pathogenic. No; archaea are prokaryotic, so they cannot cause infection. Yes; all infectious prokaryotes are archaea. Yes; certain archaea can be pathogenic, so an infection could occur.

Which of the following methods could be used to differentiate between a member of domain Bacteria and a member of domain Archaea? You could look for the presence of peptidoglycan. You could see if the organism produces rRNA. You could look for the presence of mitochondria. You could see if the organism can survive in an extreme environment. All of the above would work. None of the above would work.