Exam (elaborations)
BIO 115 EXAM 3 questions well answered to pass
- Course
- Institution
BIO 115 EXAM 3 questions well answered to pass
[Show more]
Content preview
BIO 115 EXAM 3 questions wellanswered to pass
Prokaryotes - correct answer ✔✔•Dominate life-form in the biosphere
•First organisms to live on Earth
•Adapted to a broad range of habitats
•Some adapted to extremely harsh conditions
•Most prokaryotes are unicellular, although some species aggregate in colonies
Describe the basic structure of prokaryotic cells. - correct answer ✔✔Prokaryotes are small
• Diameters in the range of 0.5-5 μm, compared to 10-100 μm for most eukaryotic cells.
• Bacterial cells in the human body outnumber human cells by a factor of 9 to 1
• The most common shapes are spheres (cocci), rods (bacilli), and spirals
Nearly all prokaryotes have a cell wall external to the plasma membrane (peptidoglycan)
Many prokaryotes secrete another sticky protective layer of polysaccharide or protein (capsule)
Pili = "long hairs"
Fimbriae = "short hairs"
, Many prokaryotes are motile (move) - flagella ("tail"- how it moves).
A taxis is the movement of an organism in response to a stimulus.
• Simpler than those of eukaryotes in both internal structure and genomic organization
• DNA in a ring (1 chromosome)
• Nucleoid
• Plasmid
Prokaryotic cells Reproduction - correct answer ✔✔Asexual: binary fission
Be able to discuss nutrition in prokaryotic cells. - correct answer ✔✔• Autotrophs
• Phototrophs (sunlight)
• Chemotrophs - hydrogen sulfide, ammonia
• Heterotrophs (Animals/Fungi)
metabolism in prokaryotic cells - correct answer ✔✔• Obligate aerobes - require O2 for cellular
respiration
• Mycobacterium tuberculosis
• Obligate anaerobes - poisoned by O2
• Clostridium botulinum
• Facultative anaerobes - use O2 if it is present but can also grow by fermentation in an anaerobic
environment
• Escherichia coli
Why are prokaryotic cells able to evolve so rapidly? - correct answer ✔✔• Short generation time - rapid
population growth - large population size
• Mutation
• Genetic recombination
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller BravelRadon. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now