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Name 5 characteristics of fungi
1. eukaryotes, 2. mold from hyphae, 3. have a cell wall, 4. are unicellular.... 5. they are NOT photosynthetic.
5 characteristics of a virus
1. they are acellular, 2. they are composed of genetic material and protein, 3. they are smaller than prokaryotic cells, 4. they are obligatory parasites, 5. they are NOT visible under a light microscope
Inserting a gene from the hepatitis B virus into yeast so that the yeast produces a viral protein is an example of......
What term synonymous with immunization, is derived from the latin name of the cowpox virus?
The ability of a lens to gather light is referred to as its
numerical aperture (wavelength + resolution)
Why does immersion oil improve resolution?
It increases numerical aperture and maintains a uniform light speed
If a microbiology lab tech. left the safranin out of the gram stain procedure what would be the result?
Gram-positive cells would be purple, and Gram negative cells would be colorless.
Name four components common to both the Gram-stain and the acid -fast stain
Primary stain, counterstain, a decolorizing agent and a counterstain. (a mordant is NOT common to both procedures)
Name four components af electron microscopy stains
tungsten, lead, uranium and osmium....... Eosin is NOT
Carl Woese proposed the concept of the domain based on differences of which cellular molecules?
Name four components associated with smear preparation
spreading the specimen onto the slide, fixation using heat, killing the microbes in the specimen and fixation using methanol or formalin. .....NOT agglutination of the specimen
Do acid-fast cells such as Mycobacterium lose the color of the primary stain in the presence of hydrochloric acid?
Which refracts more, light rays passed through the edge of a curved lens, or those which pass through the center?
The type of bond produced when atoms with significantly different electronegativities share electrons is
a polar covalent bond
what are associated with ionic bonds?
cations, electrolytes, salts and anions...... NOT radioactivity.
which PH would be alkaline?
8.0... PH with numbers lower than 7 are acidic, while PH with higher numbers are basic or alkaline.
Which of the following is NOT a characteristic of phoshpolipids
they contain fatty acids that associate with water.
Which of the following statements concerning nucleic acids is FALSE?
the nucleic acid polymer is composed of peptide bonds
An increase in the PH of a solution by 2 whole numbers represents a change in the number of hydrogen ions by what factor?
Using a microscope, you observe an amoeba moving toward a food source. This is an example of:
Which of the following bacterial cell structures plays an important role in the creation of biofilms?
both fimbriae and glycocalyces
Which of the following statements concerning prokaryotic flagella is FALSE?
Prokaryotic flagella are composed of tubulin
Bacteria of the genus Mycoplasma are distinguished from other bacterial cells by
the absence of a cell wall
Which of the following statements concerning osmosis is FALSE?
During osmosis, water crosses to the side of the membrane with a lower solute concentration.
ATP is expended in which of the following processes?
both active and transport and group translocation
when cells are placed in a hypertonic solution, they lose water and shrivel. This process is called?
Which of the following processes requires a carrier protein?
both facilitated diffusion and active transport
which of the following chemical substances contributes to the unique characteristics of acid-fast bacteria?
True or False: Peroxisomes contain enzymes used to digest nutrients that have been brought into the cell through phagocytosis
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