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43 terms

Micro Final Fall 2012 Part 1 of 5

moronic.
STUDY
PLAY
Microorganisms are not involved in this process:
smog production
Microorganisms are involved in these processes:
Oxygen production, food production, infection, decomposition of organic material
The term used to describe a disease-causing microorganism:
pathogen
Viruses are not considered living organisms because:
they cannon reproduce by themselves
If you were setting up an experiment to disprove spontaneous generation in a liquid medium, which of the following would be essential to the experiment?

a. adding antibiotics to the liquid
b. supplying the liquid with nutrients
c. starting with a liquid that contains microorganisms
d. adding carbon dioxide to the liquid
e. using a sterile liquid and elimination of exposure to microorganisms
e. using a sterile liquid and elimination of exposure to microorganisms
The arguments supporting spontaneous generation were finally disproved by
Louis Pasteur
Which of the following is the type of bond holding K+ and I- ions in KI?
ionic bond (a metal and a nonmetal)
Which is the type of bond holding hydrogen and oxygen atoms together in a H20 molecule?
covalent bond (they share electrons)
Which type of molecule is composed of CHO units?
carbohydrates
Which type of molecule contains -NH2 groups?
proteins (and nucleic acids)
Which molecule is composed of a chain of amino acids
protein
Streptococci are are shaped like:
chains of circular/round units
Staphylococci are shaped like:
clusters of circular/round units (think cluster of grapes)
What are the functions of the glycocalyx?
protection against dehydration, increases the cell's virulence, source of nutrition, biofilm formation
The glycocalyx does not have this function:
binary fission
Which structure acts like an "invisibility cloak" and protects bacteria from being phagocytized?
capsule
The terms "run" and "tumble" are generally associated with:
taxic movements of the cell
Which of the following statements is INCORRECT regarding prokaryotic cells?

a. they lack a plasma membrane
b. they typically have a circular chromosome
c. they reproduce by binary fission
d. they lack membrane-enclosed organelles
e. their DNA is not enclosed within a membrane
b. they typically have a circular chromosome
What is NOT part of the passive transport process?
ATP
Which of the following uses CO2 for carbon and H2 for energy?
chemoautotrophs
(they get energy through oxidation of electron donors in their environments and obtains carbon source externally)
Teichoic acids are found in the cell walls of which type of cells?
Gram-positive
How do spirochetes and spirilla differ?
Spirilla have an external flagella but spirochetes have axial filaments.
Which mechanisms allows a cell to transport a substance from a lower to a higher concentration?
Active transport
Define fermentation
Any metabolic process that releases energy from a sugar or other organic molecule, does not require oxygen or an electron transport system, and uses an organic molecule as the final electron acceptor.
What is not necessary for respiration?
oxygen
What uses glucose for carbon and energy?
chemoheterotrophs
T/F: Anabolic reactions are degradative?
False
How does oxygen cross the plasma membrane?
simple diffusion
In a hypertonic solution, a bacterial cell with typically
plasmolyze/crenate
T/F: Catabolic reactions are generally degradative and hydrolytic
True (cat: cat jumping down/cat: catastrophe)
T/F: The use of enzymes is necessary to increase the activation energy requirements of a chemical reaction
False
T/F: Infectious disease is almost totally eradicated in our world.
False
T/F: Spontaneous generation refers to living cells arising only from other living cells.
False
T/F: A student has obtained a sample of pond water from study. Using the high-power lens, he observes several cells with nuclei. He can conclude that the cells are NOT bacteria.
True
T/F: The cell walls of bacteria are responsible for the shape of the bacteria and the difference in the gram stain reaction.
True
T/F: Antibiotics that target the cell wall are an effective treatment against many pathogen bacteria
True
T/F: Cells placed in a hypotonic solution tend to lose water due to osmotic pressure
False
T/F: If you observe rod-shaped red cells after the gram stain, you can assume their cell walls contain endotoxin
True
T/F: All chemical reactions are, in theory, reversible
True
T/F: Individual covalent bonds are stronger than individual ionic bonds
True
T/F: Both respiration and photosynthesis require the use of an electron transport chain
True
T/F: Some viruses can contain both DNA and RNA
False
T/F: Once an enzyme has converted substrates into products, the active site reverts back to its original form
True