Some study guide questions for Exam 2
Chapters 6, 7, 11 + parts of chapters 26, 27, 48
Understand Miller-Urey experiment. What were the results?
What are the three domains of life?
Archaea, Bacteria, Eukarya
What are the characteristic components of prokaryotes?
Plasma Membrane, Gas Vacuole, Ribosome, Nucleoid, Cell wall,
Fimbriae and Pille, Gagella, Endospore.
Compare and contrast bacteria and archaea with respect to characteristics
discussed in class.(circle Diagram)
What is the bacterial cell wall made up of? Is this present in Archaea and
What extracellular structures are present outside the cell wall in certain bacteria?
Fagellum and the Pilli(sex organs)
What are the functions of the following in bacteria: plasma membrane, gas
vacuole, endospore, cell wall, flagella, pili, nucleoid, ribosomes.
Plasma Membrane- Permeable barrier, boundry of cell, nutrient and waste
transport, metabolic processes(respiration ect.)
Gas Vacole- Makes it able to float in aquatic environments
Endospore- Makes it able to survive in harsh conditions
Cell Wall- Gives shape and protection from lysis in dilute solutions
Flagella- Helps with movement
Pilli- Sex organs
Nucleoid- Location of DNA
Ribosome- Synthesis of proteins.
Do bacteria have membrane bound organelles? Are ribosomes present in bacteria
Bacteria and Archaea do not have membrane bound organelles.
Ribosomes are present in bacteria and Archaea
What are the energy sources in photoautotrophs and chemoautotrophs? What is
their carbon source?
Photoautotrophs use light as their energy source and CO2 as their carbon
source. Chemoautotrophs use inorganic compounds as their energy source
CO2 as well.
10) What are the energy and carbon sources in photoheterotrophs and
Photeheterotrophs use light as their energy source and
chemoherteroprophs use organic compounds. They both use organic
compounds as their carbon sources.
11) What kinds of environments do extreme halophiles and thermophiles live in?
What are methanogens?
Thermophiles live in very hot environments and halophiles live in highly
Methanogens are a unique was of obtaining energy, they produce methane
from carbon dioxide and hydrogen, and live in swamps and marshes.