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Bio 211 Chapter 12 Homework
Terms in this set (11)
Drag each statement into the appropriate bin.
- cell wall contains peptidoglycan or pseudomurein
-singular circular chromosome
-membranous organelles, including mitochondria, lysosomes , endoplasmic reticuum
-nuclear envelope compartmentalizes the chromosomes
Both prokaryotes and eukaryotes:
- has both DNA and RNA
- plasma membrane encloses the cytoplasm
-includes unicellular cells
Select the eukaryotic organisms that are involved in causing or spreading disease.
For each of the following statements, indicate whether it is most appropriately applied to arthropods, helminths, fungi, algae, or protozoa.
-Members of this group serve as vectors, transmitting several different viruses, bacteria, and protozoan parasites between hosts
- Members of this group have hard exoskeletons and jointed appendages
-Members of this group come in flat or round forms, and although many parasitize animals, there are also free-living forms
-Parasitic members of this group often have complex life cycles involving one or more intermediate hosts in which larvae develop
-Members of this group produce a variety of different reproductive spores and filaments referred to as hyphae
-This group includes unicellular as well as filamentous forms, a number of which cause infections
-Members of this group are found predominantly in aquatic environments
-Members of this group generally don't cause infections, but some produce neurotoxins that cause intoxications in animals that consume them
-Members of this group cause malaria and diarrheal illnesses such as amebiasis and giardiasis
-Many members of this group are motile by means of cilia, flagella or pseudopods
Drag the terms in the left-hand column to the appropriate blanks in the sentences on the right. Make certain all sentences are complete before submitting your answer.
1. Asexual spores that form as buds coming off the parent cell are known as blastoconidia and are produced by yeasts such as Candida albicans and Cryptococcus neoformans.
2. Sexual spores known as basidiospores are located on a base pedestal and are found in mushrooms.
3. Candida albicans, a species of pathogenic yeast, is often recognized by its chlamydoconidia, which are large, thick-walled asexual spores within a hyphal segment.
4. Coccidioides immitis is a pathogenic fungus that forms asexual spores called arthroconidia, which result from fragmentation of hyphae.
5. Some fungi reproduce sexually by forming ascospores, which are sexual spores contained within a sac structure.
6. Rhizopus stolonifer, the common black bread mold, forms asexual spores called sporangiospores, which are contained in a sac at the end of aerial hyphae.
Select all of the statements below that accurately describe characteristics of algae.
-Most algae have a plantlike cell wall composed of cellulose.
-Both asexual and sexual reproduction occurs among the diversity of algal species.
-Algae may be green, red, or brown.
-Some marine algae produce neurotoxins that can be concentrated in shellfish and pose a risk of paralytic shellfish poisoning to humans who consume the shellfish.
-Algae lack roots, stems, leaves, and vascular tissues that are found in terrestrial plants.
Select the statements that correctly describe protozoa.
-While living in the gut of their host, intestinal protozoan parasites are usually in the trophozoite form.
-As a group, protozoa exhibit both asexual and sexual reproduction.
-Most protozoa are motile via pseudopods, flagella, cilia, or undulating membranes.
-Protozoan cysts enable protozoan parasites to survive during passage from one host to the next.
Select the statements that correctly describe medically important helminths.
-Either eggs or larval stages of helminths may be infectious, depending on the species.
-The major organ system apparent in tapeworm proglottids is the reproductive system.
-Parasitic helminths lack a complete digestive system and they absorb nutrients directly through their cuticles.
-Some helminth infections involve more than one intermediate host.
-Humans can serve as either definitive or intermediate hosts of flatworms.
Now that we have reviewed the basic groups of pathogenic eukaryotes, let's see if you can identify which group each of the following eukaryotes belongs to.
Drag the description and illustration into the bin in which they belong.
Algae: This was recovered from a sample of pond water
Fungi: These were recovered from a vaginal swab from a woman complaining of a vaginal discharge accompanied by intense vaginal itching
Protozoa: These were observed in a duodenal specimen from a patient with diarrhea. They moved actively by using flagella
-These were passed in a stool specimen from a patient who had NO obvious intestinal symptoms
-This was observed in the stool specimen of a patient. The patient had complained of mild intestinal discomfort and was slightly anemic
What is the key difference between yeast and mold?
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?
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.
Which of the following new chemicals would NOT be effective against Giardia?
a chemical that inhibits the formation of cell walls
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