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Microbiologyfinalt1
| Question | Answer |
|---|---|
| The process involving the use of techniques to improve the quality of products is more likely related with: | genetic engineering |
| One of the following diseases is the second most common infectious causes of death in developed countries: | AIDS |
| Opportunistic infections are caused by pathogens that penetrate the skin: | false |
| it is characteristic of prokaryotic organisms | to lack ER and golgi complex |
| Viruses are simple particles composed of a nucleic acid and protein | true |
| Regarding size of microorganisms and as general rule, viruses are more likely measured in | nanometers |
| Leeuwenhoek was very important in microbiology because he discovered the microscope | true |
| What is characteristic of a particular hypothesis in science | based on solid data |
| Identify the correct way to write the name of the pathogen causing tuberculosis, when using the first time: | Mycobacterium tuberculosis (underlined only) |
| One of the following invented a meathod to reduce the number of microbes causing fermentation and spoilage: | Pasteur |
| Discovering and recording traits of organisms for placement into taxonomic schemes is more likely related with one of the following: | identification |
| According to evolution, chages favoring survival are lost and less beneficial changes are retained | false |
| Animal and plants belong more likely to one of the following domains: | eukarya |
| The number of protons + neutrons + electrons in an atom is referred to as its | atomic mass |
| If the atomic mass of one atom is 23 and its atomic number is 11, then this atom has: | 12 neutrons |
| Isotopes are 2 or more atoms that differ in its number of protons: | false |
| Only one of these subatomic particles particpates in chemical reactions: | electrons |
| Electrons located in the outermost shell are called valence electrons: | true |
| Elements with a full valence shell are: | Inert or inactive |
| An atom with 5 electrons in the second (outermost) shell has a bonding capacity of | 3 |
| Sharing electrons is a characteristic of | covalent bond |
| Atoms share electrons equally in a nonpolar bond | true |
| An atom that loses electrons becomes a cation | true |
| Covalent bonds between two atoms of the same element are called pure elements | true |
| An atom becomes oxidized when: | gives up electrons |
| If you combine salt in water, salt is more likely called: | solute |
| A solution with pH=5 compared to another with pH=3 is: | 100 times more basic |
| one of the following macromolecules is more likely a monosaccharide: | glucose, fructose, galactose (b,c,d) |
| The formation of a-helix and b-pleated sheets (coils and folds) in a protein is related with its: | secondary structure |
| The following sequence (ATGTACTGCATC)is more likely: | DNA |
| One of the following is not part of one of the methods of culturing microorganisms: | information |
| The separation of one single species of bacterial cells from another species of bacterial cells is referred as: | isolation |
| Synthetic and nonsynthetic media is classifed more likely according to its | chemical composition |
| Media that grow several types of microorganisms, but bring up visible differences among those microorganisms are | differential |
| A medium that contains brain-heart extract is more likely to be: | complex |
| medium containing blood, serum, hemoglobin or special growth factors is more likely: | enriched |
| One of these microscopes has the best resolving power; all of them have objective lenses with the same numerical aperture (NA): | 5nm wavelength |
| The resolving power of a compound microscope depends on | wavelength of light, numerical aperture of lenses (b,c) |
| Transmission electron microscopes (TEM) allow seeing the internal parts of microorganisms | true |
| In a negative staining, microoganisms and not the background are stained | false |
| According to the pattern of flagella in prokaryotic cells, peritrichous refers to: | flagella dispersed everywhere |
| organisms with a thick sheath of peptidoglycan are more likely: | gram positive bacteria |
| regarding gram staining, one of the following is important to increase the size of the primary stain: | Iodine (mordant) |
| regarding bacterial endospores, sporulation more likely related with the formation of endospores | true |
| One of the following terms is part of the diagnostic scheme for medical use based on cell wall structure | gram positive |
| Chlamydia trachomatis is an unusual type of bacteria that causes epidemic typhus | false |
| regarding arragement of bacteria, cells that divide in several planes (more than 2) are more likely: | staphylococcus |
| Subspecies of bacteria showing differences in their susceptibility to bacterial viruses are referred as: | phage type |
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