110 terms

Microbiology Test 1

Metabolism, Growth and Control
Organisms which make their own food using energy from sunlit are called...
Organisms which use energy from inorganic substances to make organic compounds are...
Organisms which need organic chemicals as a source of both energy and carbon are...
The element necessary for all organic compounds is...
The synthesis of both amino acids and nucleotides involves a source of the element...
The element necessary to maintain the shape of complex proteins is...
The element phosphorus is an essential component of...
Nucleotides and Phospholipids
Organisms which require oxygen are called...
Obligate Aerobes
The term Facultative Anaerobe refers to an organism that...
Uses oxygen or grows without oxygen
Organisms which cannot survive the presence of oxygen are...
Obligate Anaerobes
Organisms which are indifferent to the presence of oxygen are...
Which is the most toxic form of oxygen?
Hydroxide Free Radical
Which is a normal by-product of Aerobic Metabolism (type of oxygen)?
Superoxide Free Radical
Which of the following is the least reactive form of oxygen?
Diatomic Oxygen (Regular O2)
Which of the following is the most probable room temperature?
20 degrees C
"Heat Loving" bacteria are called...
"Cold Loving" bacteria are called...
Bacteria which thrive at human body temperatures are called...
The optimum temperature of most pathogenic organisms is...
37 degrees C
A bacteria capable of withstanding abnormally high osmotic pressure is...
Halobacteria Halobium
What is the optimum pH for fungi?
What is the pH range for most bacteria?
Substances used to stabilize pH are called...
Organisms which are able to withstand high pressure are...
A polysaccharide thickener derived from marine alga is...
A reducing medium is needed for the growth of --- organisms.
A medium containing beef extract would be considered a --- medium.
Blood agar is an example of a --- medium.
A medium containing an inhibitor (to keep out unwanted growth) would be considered a --- medium.
The armadillo is used in the study of the organism...
Mycobacterium Leprae
A technique used to preserve bacteria for extended time periods is...
Lyophilization (10+ years)
The most common method of bacterial reproduction is...
Transverse Fission
Most bacterial division occurs as (describe action)...
...the membrane furrows and the cell wall grows inward.
The period of most rapid bacterial growth is...
The time during which organisms are acclimating to their environment is called the...
The most direct measurement of bacteria is...
Petroff-Hauser Counter
Which method involves the most time lapse, but is the most common way to measure bacterial numbers?
Standard Plate Count
An indirect method of measuring bacterial growth which can be used after short growth periods is the...
Spectrophotometer Transmittance
Packed cell density involves the use of a...
A chemical reaction releasing energy is called...
A chemical reaction requiring energy is called...
Vitamins or their derivatives may act as --- in metabolism.
The type of inhibition which denatures the enzyme is...
The type of inhibition in which the active site is blocked is called...
Phosphorylation is involved in the formation of...
NAD, NADP and FAD are important to the metabolic pathways because they are...
Hydrogen Transport Molecules
The vitamin(s) essential for energy transport is/are...
The catabolism of glucose first involves a pathway resulting in the production of the compound...
A widely used pathway involving five-carbon intermediates in the catabolism of carbohydrates is the --- pathway.
Pentose Phosphate
The pathway used by all organisms to catabolize glucose is the --- pathway.
During the fermentation process, which is not a possible product?
The reaction in which Fructose 1, 6-biphosphate is converted to two molecules of Glyceraldehyde 3-phosphate is an example of...
In the transformation of Isocitrate to a-ketoglutarate, carbon dioxide is removed. This process is called...
Rearranging of a molecule's atoms - converting one isomer into another.
The transfer of electrons and hydrogens to the molecule NAD to form NADH2 in the same step is referred to as...
In the Kreb's Cycle, fumarate is converted to malate by the addition of water. This reaction is called...
Citrate is converted to Cis-aconitate by the removal of water. This process is called...
During the initial step of the Kreb's cycle, an acetyl group is added to oxaloaccetate (C2 to C4) to form citric acid (C6). This reaction is a...
Glycolysis is...
The starting material of the glycolysis pathway is...
What is not a product of Glycolysis?
Carbon Dioxide
Glycolysis occurs in the...
The first step in Glycolysis produces (what molecule)...
The initial steps in the glycolysis release energy (True or False)?
Energy is added to a molecule by the addition of phosphate from...
The glycolysis process produces a net gain of --- ATP/Glucose.
The reaction preceeding the Krebs Cycle is a sequence involving...
Coenzyme A
The Krebs cycle starts with the formation of...
Citric Acid
The formation of acetyl CoA involves what catalyst?
A by-product of the Krebs cycle is...
Carbon Dioxide
How many ATP molecules/glucose are produced directly from the Krebs cycle?
How many NADH2 molecules are produced from the Krebs cycle?
How many FADH2 molecules are produced from the Krebs cycle?
Which product of the Krebs cycle pass into the electron transport chain?
A product of the electron transport chain is...
What are the electron carriers based on the heme molecule?
What are the electron carriers based on the quinone molecule?
Coenzyme Q
During cellular respiration in eukaryotes, electron transport occurs in the...
Which of the following is usually not anaerobic? Alcohol production, Electron Transport, Glycolysis, Lactic Acid Production, or All.
Electron Transport
Hydrogen ions involved in energy utilization pass into the --- system.
Electron Transport
Anaerobic respiration in yeasts and plants may result in the production of...
What is not a fuel produced by microorganisms?
Fermentation works to preserve foods because of...
Acids and Alcohols
In the synthesis of biomolecules, which of the following is not completely amphibolic? Calvin, Electron Transport, Fermentation, Glycolysis, Krebs.
A form of bacterial control which inhibits growth, but doesn't kill it is...
A form of bacterial control which kills all life forms, including endospores and viruses...
The control method most likely to be used in cleansing wounds is...
One result of washing regularly with antibacterial agents is the removal of normal microbiota. This can result in...
Increased susceptibility to disease
In general, the type of microbe least difficult to control is a/n...
The classic pasteurization process normally involves a temperature of...
72 degrees C
Which of the following would be the most likely method to be used in sterilizing bandages?
The standard for comparison of chemical disinfectants is...
Alcohols generally destroy microbes by...
Damaging proteins
A/n --- is least likely to be damaged by disinfectants.
Which process is used to preserve foods by affecting osmotic pressure?
The symbol µ represents a...
List requirements which must be considered for optimal growth of microbes (8).
Nutrients, moisture, oxygen level, pH, temperature, sterility, osmotic pressure, and barometric pressure.
Describe the bacterial growth curve. During which period would you measure generation time?
LAG: Little or no cell division, intense metabolic activity, gearing up for next action.
LOG: High activity and growth/division. During this time, generations are measured.
STATIONARY: Growth=Death rate, decline due to exhaustion of nutrients.
DEATH: Growth rate is less than the death rate.
Compare aerobic respiration and fermentation.
Both start in the cytoplasm with glycolysis and yeild 2 ATP. Then, in respiration, the process moves on to acetyl-coA formation, the Krebs cycle and electron transport. Final ATP is 36. For fermentation, the process ends at glycolysis, ending with only 2 ATP.
List characteristics of an ideal disinfectant (8).
Kills germs (antimicrobial), works at normal temperatures, liquid (soluble), works rapidly, stable, nontoxic to pets and humans, homogeneous (same stuff throughout), noncorroding.
List physical methods of microbial control (6).
Heat (autoclave, moist, dry), Filtration, Low Temperatures (freezing), Dessication (drying out), Radiation, Osmotic Pressure (salting or sugaring).
List four mechanisms by which microbial control may work.
1. Damage cell wall
2. Alter membrane permiability
3. Alter proteins or nucleic acid
4. Inhibit enzyme action
List groups of chemicals used to control microbes (specific examples).
PHENOLS: damages plasma membrane and denatures protein.
ALCOHOLS: Dissolves lipids, dehydrates, and denatures proteins.
HALOGEN (Iodine): Combines with proteins and oxidizes.
HEAVY METALS (Silver, Copper, Zinc): Denatures -SH bond and high affinity for all proteins.
Lab precautions.
Utilitarian clothing. Hair tied back. Clear and cleaned workspaces. No eating, drinking or smoking. No objects in mouth. Microscopes should not be plugged in at the same time as the burners. Culture spills should be mopped up immediately. Infectious or used materials should be disposed of properly. Do not move through lab with loop or pipette containing microbes. Label all materials with name, date, specimen and medium used.
Aerobic Respiration
Respiration that requires oxygen.
Process by which cells release energy in the absence of oxygen.

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