Some study guide questions for Exam 2
Chapters 6, 7, 11 + parts of chapters 26, 27, 48
(Dependent on how much we cover before exam 2)
1) Understand Miller-Urey experiment. What were the results?
Compounds such as hydrogen cyanide and formaldehyde were formed.
Urea was created.
What are the three domains of life?
Bacteria, Archaea, Eukarya
What are the characteristic components of prokaryotes?
Plasma membrane, cell wall, gas vacuole, ribosomes, fimbrae and pili, flagella,
Compare and contrast bacteria and archaea with respect to characteristics
discussed in class.
Bacteria – cell walls have peptidoglycan
Archaea – cell walls do not have peptidoglycan, lipids have ether linkages
What is the bacterial cell wall made up of? Is this present in Archaea and
Peptidoglycan; It is present in bacteria
What extracellular structures are present outside the cell wall in certain bacteria?
Pili (sex organ), flagella, fimbrae, capsule outside the cell wall
What are the functions of the following in bacteria: plasma membrane, gas vacuole,
endospore, cell wall, flagella, pili, nucleoid, ribosomes.
Plasma membrane – controls what goes in and out
Gas vacuole – for buoyancy
Endospore – protect the DNA; for survival under harsh conditions
Cell wall – shape and protection
Flagella – mobility
Pili – sex organ
Nucleoid – site of DNA
Ribosomes – for protein synthesis
Do bacteria have membrane bound organelles? Are ribosomes present in bacteria
No; Ribosomes are present in both domains.
What are the energy sources in photoautotrophs and chemoautotrophs?
Photoautotrophs – Light
Chemoautotrophs – Inorganic compounds
What is their carbon source?