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MCB 100 Exam 1
Terms in this set (50)
Which one of the following types of microorganism is characterized by having eukaryotic type cells that lack a cell wall?
Which one of the following groups of microorganisms includes some examples that have genomic information stored as RNA rather than DNA?
Who (and when) is credited with first proving that a specific disease is caused by a specific type of bacteria?
Robert Koch (1876)
The discovery that the Archaea are a group of prokaryotic microorganisms that are distinctly different from the bacteria occurred in the ___________.
Which one of the following types of microorganisms is characterized by having eukaryotic cells, a cell wall that is composed of chitin, does not carry out photosynthesis and is unicellular?
Which one of the following statements about the sizes of microorganisms and the components they are made of is false?
A typical virus is larger than a typical protozoa
To satisfy Koch's postulates you must:
Be able to identify the suspected microorganism, be able to obtain a pure culture of the suspected microorganism, produce the disease of interest in an experimentally inoculated host, and be able to detect the suspected microorganism in all patients that have the disease
Which one of the following structures is a feature of all cellular life forms?
Transfer RNAs (tRNA)
Which one of the following is not an organic compound?
Which one of the following organic functional groups is non-polar?
The chemical bond between an oxygen atom and a carbon atom in an internal carbonyl group (ketone) is:
Formed by sharing of electrons between the carbon and oxygen atoms, polar, an example of a double covalent bond, and similar to a bond between carbon and oxygen in an aldehyde group
Which one of the following statements about proteins is false?
There are four different amino acids found in proteins
Which two of the following statements about ATP are true?
ATP has two high energy phosphoanhydride bonds and ATP is used as a precursor of RNA synthesis
Which one of the following statements about pH is false?
Strong acids have a high pH
According to our current best understanding of the fossil record, which one of the following statements about microorganisms and the natural history of life on our plant is false?
Flowering plants appeared before photosynthetic bacteria
What type of compound is found in the cytoplasmic membranes of eukaryotic cells but not in the cytoplasmic membrane of most bacterial cells?
Which one of these biochemical processes is an example of a hydrolysis reaction?
Breaking down a complex carbohydrate into simple sugars
Which of the following is a trait seen in both eukaryotic and prokaryotic cells?
The genetic material is DNA
Which one of the following statements about mitochondria is false?
Mitochondria are part of the Endoplasmic Reticulum
Which one of these statements about the function of biological molecules is true?
Enzymes are proteins (mostly) that increase the rate of biochemical reactions
Which one of the following substances is found in Gram positive bacterial cells but not in Gram negative cells?
Which one of the following statements about peptidoglycan is false?
All prokaryotic organisms have cell walls composed of peptidoglycan
Which one of the following statements regarding bacterial pili is false?
Pili are rod-like structures that are made of polysaccharides
The upper limit on the practical magnification that can be used with a microscope is:
Higher if the limit of resolution is smaller
The microscope which makes the cells appear bright against a darkened background because the specimen is fluorescent or stand with a fluorescent dye is the:
In the cells of aerobic bacteria, the enzymes and electron carries that are involved aerobic respiration are found in the:
The cytoplasm of many types of bacteria contains granules or inclusion bodies. Which of the following substances can be found in bacterial inclusion bodies?
Starch, sulfur, polyhydroxybutyrate, and polyphosphates
A marine brown alga may form a frond several meters long (seaweed) but it is still considered to be a microorganism because it:
Lacks tissue differentiation and organs
Which of the following types of cell walls are composed in part of peptidoglycan?
The bacterial endospore wall, the cell wall of a Gram positive bacteria, and the cell wall of Gram negative bacteria
Many types of bacteria will excrete a layer of polysaccharides to coat the surface of their cells because a capsule may do all of the following except:
Increase the surface area of the cytoplasmic membrane
In photosynthetic bacteria the membranous structures that contain light harvesting pigments (bacteriochlorophylls) are called the photosynthetic lamellae or the:
What is the term for this type of flagella arrangement?
The temperature at which a culture of bacteria grows at the fastest rate is called the:
Optium growth temperature
Which one of the following lists put the items in the proper order from smallest to largest in size?
Atom, amino acid, protein, virus, a typical bacterium, and a typical protozoa
Which one of the following statements about nucleotides and nucleic acids is false?
The sulfur containing amino acid, methane is found in nucleic acids
The site of energy production by cellular respiration in eukaryotes is/are:
Which one of the following substances is found in a bacterial cell wall but not a plant or fungal cell wall?
Unusual amino acids like D-alanine and diaminopimelic acid
What sort of stain could be used as part of the procedure to identify Bacillus anthrasis or Clostridium botulinum?
The Schaeffer-Fulton Endospore stain
A bacterium that grows best at moderate temperatures but can survive exposure to high temperatures is called:
In a complex medium:
There may be vitamin present that you don't know about
Which of the following methods used to count the number of bacteria in a sample requires an incubation period that is long enough for one cell to grow into a visible colony or a noticeably turbid broth culture?
Membrane filtration, most probably number method. and viable plant count
When a mixture of bacteria from a water sample is spread on a Petri dish of MacConkey agar, most of the Gram negative bacteria grow but most of the other Gram positive bacteria do not grow because of the presence of dyes and bile salts. In this respect MacConkey agar is an example of:
A selective medium
When Esherichia coli is grown on a Petri dish of MacConkey agar, the colonies turn brick red. But when Salmonella typhimurium is grown on this same medium, the colonies are white. In this respect MacConkey agar is an example of:
A differential medium
Bacterial growth by binary fission allows a single cell to produce about 1000 progeny in _______ generations.
Which of the following bacterial identification techniques relies on the differences in the metabolic pathways that are seen in various species?
A bacterium that acquires energy by oxidizing organic compounds and also uses organic compounds as a carbon source is classified as a:
A microorganism that grows best at a high concentration of salt is classified as:
All cells require a source of all of the following except:
The Gram stain divides microorganisms into two groups, purple vs. red, on the basis of differences in the:
Thickness of the cell wall
For a bacterial culture that is growing in exponential phase with a generation time of 30 minutes, how many cells can be produced from one cell in fifteen hours?
Slightly more than a billion
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