DOC PREVIEW
ISU BIOL 211 - Worksheet and Answer

This preview shows page 1 out of 4 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 4 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 4 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

Week 2, Session 1Chapters 26-27Important text sections: 26.1, 26.3, 26.6,27.1, 27.2, Supplemental InstructionIowa State UniversityLeader: KelseyCourse: Bio 211Instructor: Dr. HolscherDate: 8-31-09Phylogeny1. Who first developed the binomial nomenclature system? Carolus Linneausa. What are the two components of the binomial nomenclature format? genus and speciesb. Give an example of this format: homo sapiens Cladistics1. What is the primary criterion in the methodology of cladistics? Common ancestry is the primary criterion used in cladistics. 2. A true clade is: a. monopyleticb. paraphyleticc. polyphyletic3. Draw an example of a clade: Three Domain System1. What are the domains are found in the three-domain system? Eukarya Bacteria ArchaeaSupplemental Instruction1060 Hixson-Lied Student Success Center v 294-6624 v www.si.iastate.eduCharacteristics of Prokaryotes1. List four characteristics of prokaryotes: able to live in extreme environments first organism on earth unicellular have a diameter of around 0.5-5 micrometers2. Name and draw the three common shapes of prokaryotes:Cocci (spherical) Bacilli (rod-shaped) Spriochetes (spiral)3. A gram-positive__ bacteria has a thick cell wall made of peptidoglycan that causes it to appearpurple_ during gram staining. 4. A gram-negative bacteria has a thin layer of peptidoglycan sandwiched between two membranes that causes it to appear _pink/red_ during gram staining. 5. Match the following prokaryotic cell structures with their function: 1. capsule __a__ 2. fimbriae __c__3. sex pili __d__ 4. flagellum __b__5. endospores __e__6. List and describe the three ways in which prokaryotes perform genetic recombination: Transformation Transduction ConjugationA prokaryotic cell takes up foreign DNA from its surroundings.Bacteriophages move bacterialgenes from one host to a different host.Two bacterial cells temporarily join and transfer the material between them.7. Describe the four modes of nutrition in prokaryotes:Photoautotrophs Chemoautotrophs Photoheterotrophs ChemoheterotrophsUse light energy to drive synthesis of organic compounds.Oxidize inorganic substances to use as a carbon source.Use light energy and must obtain carbon in organic form.Must consume organicmolecules for energy and carbon. a. a sticky layer that allows prokaryotes to adhere to other thingsb. a structure that enables motility by propulsionc. hair-like appendages that aid the cell in sticking to otherthingsd. an appendage used to pull two cells together for DNA transfere. resistant cells that form when nutrients are lacking8. Write in the name of the oxygen-use type that matches the given definitions: Obligate aerobe Obligate anaerobe Facultative anaerobeRequire oxygen for cellular respiration, cannot grow without oxygen.Are poisoned by oxygen, cannot grow in the presence ofoxygen.Use oxygen if it is present but can also grow without oxygen.9. What is the most important role that prokaryotes play in the biosphere? Decomposers- break down corpses, waste, and dead plants which releases carbon and nitrogen. 10. Describe the four types of ecological interactions that exist between prokaryotes and other organisms:  Symbiosis: a relationship in which two species live in close contacto Mutualism: both species benefito Commensalism: one species benefits, the other is neither harmed nor helpedo Parasitism: a parasite eats the tissues or fluids of its host, which harms the hostArchaea1. Name the three types of extremophiles, and describe their living conditions/preferences:Halophiles Thermophiles MethanogensEither tolerate or prefer highlysaline environments.Thrive in extremely hot environments.Obtain energy by using carbondioxide to oxidize hydrogen gas, releasing methane as a waste product. Bacteria1. True or false: All bacteria are pathogenic (harmful). _Falsea. If this is false, give an example of a non-pathogenic (beneficial) type of bacteria:Many are found in human intestines. We have a mutualistic relationship with these bacteria and depend on them to help digest some foods we eat.2. __Exotoxins___ are poisonous illness-causing proteins secreted by bacteria and other organisms. An example of this type of toxin is _cholera_. 3. _Endotoxins______ are components of the outer membrane of some types of bacteria that are released when the cell walls break down. An example of this type of toxin is _salmonella_.4. List four ways in which bacteria and/or archaea are being used in research, technology, and industry today:  Food production- cheese and yogurt Bioremediation- use of organisms to remove pollutants from soil, air, and water Production of natural plastics Modification of vitamins, antibiotics, and


View Full Document

ISU BIOL 211 - Worksheet and Answer

Documents in this Course
Meiosis

Meiosis

2 pages

Mitosis

Mitosis

2 pages

Fungi

Fungi

2 pages

Review

Review

7 pages

Review

Review

4 pages

Exam 4

Exam 4

2 pages

Meiosis

Meiosis

2 pages

Quiz

Quiz

3 pages

Exam 1

Exam 1

4 pages

Review

Review

4 pages

Load more
Download Worksheet and Answer
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Worksheet and Answer and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Worksheet and Answer 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?