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 |