Nester's Microbiology: A Human Perspective
9th Edition
ISBN: 9781259709999
Author: Denise G. Anderson Lecturer, Sarah Salm, Deborah Allen
Publisher: McGraw-Hill Education
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Chapter 12, Problem 1CT
If you discovered a new type of nucleated cell in a lake near your home, how would you determine whether the cell was from a
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You isolated a new microorganism that has single cells and appear to lack a nucleus.Chemical analysis show the presence of both DNA and RNA in the cytoplasm and pseudomurein in the cell wall. In which of the following groups would the organism be classified?
Protists are a group of eukaryotic organisms that are brought together by scientists mostly by convenience. I) What is the relationship between all protists that ties them together? ii) provide an example of a autotrophic and heterotrophic protists group, iii) what is the relationship between the multicellular eukaryotes and the protists?
You are given five test tubes, each containing an unknown protist, and your task is to read the description below and match these five protists that you know to the correct test tube.
-Paramecium
-Pfiesteria (dinoflagellate)
-Navicula (diatom)
-Plasmodium
-Amoeba
In test tube 1, you sketch the organism and come up with a picture that looks like the one below. You note the organism appears to be “eating” the smaller microorganism.
Chemical analysis of test tube 2 indicates the presence of a chemical that is toxic to fish and humans.
In test tube 3, you detect the presence of substantial amounts of silica.
Microscopic analysis of organisms in tube 4 reveals the presence of an apicoplast in the organism
Microscopic analysis of the contents in tube 5 reveals the presence of one large macronucleus and several small micronuclei in each organism
Match the description with the correct protist
Chapter 12 Solutions
Nester's Microbiology: A Human Perspective
Ch. 12 -
1. What are the major differences between a...Ch. 12 - Prob. 2SACh. 12 -
3. Why are few lichens found in industrial...Ch. 12 - Prob. 4SACh. 12 - Prob. 5SACh. 12 - Prob. 6SACh. 12 -
7. Compare and contrast the organisms that cause...Ch. 12 - Name a disease for which humans are an...Ch. 12 - Prob. 9SACh. 12 -
10. Explain how an insect might act as a...
Ch. 12 -
1. Members of this group have chitinous cell...Ch. 12 - Prob. 2MCCh. 12 - Prob. 3MCCh. 12 - Prob. 4MCCh. 12 - Prob. 5MCCh. 12 - Prob. 6MCCh. 12 - The current phylogeny of eukaryotes is based upon...Ch. 12 -
8. All algae have
a) chlorophyll a.
b) cell walls...Ch. 12 - Prob. 9MCCh. 12 -
10. Which of the following statements regarding...Ch. 12 - Prob. 1ACh. 12 - Paper recycling companies refuse to collect paper...Ch. 12 -
1. If you discovered a new type of nucleated cell...Ch. 12 - Prob. 2CT
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- Are protozoa harmful to humans?arrow_forwardTwenty years ago, Pneumocystis jirovecii, a pathogen of immunocompromised patients that causes pneumonia, was classified as a protozoan because it is a chemoheterotroph that lacks a cell wall. However, taxonomists today classify Pneumocystitis as a fungus. Why do you think it was originally misclassified?arrow_forwardHow are cysts of protozoa similar to bacterial endospores? How are they different?arrow_forward
- Endosymbiosis greatly altered eukaryotes as they acquired organelles. In the red algae shown below, the mitochondria is on left (solid lines), the chloroplast is in the middle (dotted lines), and the nucleus is on the right (dashed lines).arrow_forwarda salt water protist is placed in fresh water. Which of the following events would most likely occur? a.) the cell would shrink b.) the cell would remain the same (no change in shape) c.) the cell would start to cry d.) the cell would swell e.) an increase in the action of its ciliaarrow_forwardWhich of the following statements regarding protozoa is false?a) Some protozoa lack mitochondria.b) Some protozoa contain chlorophyll.c) Some protozoa are parasitic.d) Malaria is caused by a protozoan.arrow_forward
- How are protozoa classified according to: Number of Cells Size of Cells Presence or Absence of Nucleus Form or Shapearrow_forward1:30 Question 18 Mention one method by which wheat rust can be controlled. Use the editor to format your answer Question 19 .. is a protistan that can be autotrophic or heterotrophic A) Giardia B Euglena C) Plasmodium D Amoeba To which Supergroups the following groups of organisms belong? 1. Brown algae 2. Euglenids 3. Amoeboids 4. Fungi Use the editor to format your answer Question 21 Alternation of generation life cycle includes: A) two meiosis division and two mitosis B) three mitosis division and one meiosis c) one mitosis division and one meiosis D) two meiosis division and one mitosis Question 22arrow_forwardThe term protista refers to : a) A kingdom within the superkingom SAR. b) A kingdom within the superkingdom Excavata. c) It is a descriptive term or common name for unicellular, colonial, and some multicellular organisms that lack true tissues. d) A phylum within the Kingdom Metazoa. Which term best describes the following organism: a unicellular (single celled) eukaryote that has a single large mitochondrion, and causes Chagas disease or sleeping sickness. a) Hypermastigophora. b) Diplomonada. c) Algae. d) Trypanosoma. e) Rhizopoda. 4. What term best describes the following organism: a multicellular eukaryote with a chitinous cell wall that is an absorptive heterotroph? a) Fungi. b) Metazoa. c) Plantae. d) Excavata.arrow_forward
- Oscillatoria is a thread-shaped Cyanobacteria, while Spirogyra is a thread-shaped Protist. Make a table the difference!arrow_forwardIn 1985, a 0.5-mm cell was discovered in surgeonfish and named Epulopiscium fishelsoni. It was presumed to be a protozoan. In 1993, researchers determined that Epulopiscium is actually a gram-positive bacterium. Why do you suppose this organism was initially identified as a protozoan?arrow_forwardIf you visit a lake in the middle of the Amazon and take water samples to analyze under a microscope from a nearby university that has good instrumentation and there you detect microorganisms that are not visible to the naked eye. What studies would you do to determine if they are bacteria, archaea, fungi or protozoa? Explain each type of analysis and how would you rule out members of each group? Write at least 3 paragraphsarrow_forward
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