exam 1 questions Flashcards
The human body only contains bacteria during illness
- T/F
False
Viroids are naked (lacking a protein shell) pieces of RNA that infects plants
- T/F
True
Spontaneous generation refers to the idea that organisms came from other organisms
- T/F
False
The structures present in the hay infusions used in experiments on spontaneous generation that made them difficult to sterilize are
Endospores
The outbreak of measles within the last few years is due to…
a decline in the vaccination of children in the previous years
Ulcers previously thought to be caused by stress are in fact often caused by…
a bacterial infection
Which of the following regarding normal microbiota is TRUE…
normal microbiota protect us from disease by competing with pathogenic bacteria
The cell types that lack a membrane bound nucleus and have a rigid cell walls of peptidoglycan are…
bacteria
DNA is always double-stranded but RNA is always single stranded
- T/F
True
Lipids are polar, hydrophilic molecules
- T/F
False
Saturated fats have no double bonds in the hydrocarbon chain of fatty acids
- T/F
True
This reaction occurs when two monomers are joined together through the loss of a water molecule…
dehydration synthesis
Sharing of electrons between two atoms forms a(n)
covalent bond
Which statement regarding pH is correct…
pH is a measure of the hydrogen ion concentration in a solution
Which is the uncharged component of the atom
neutron
The carbohydrates found in nucleic acids is…
ribose or deoxyribose
A fly is considered a mechanical vector
- T/F
True
The natural habitat of a pathogen is referred to as its…
Reservoir
An epidemic that spreads worldwide is called a(n)…
Pandemic
Important sources of contamination in crowded locations are
saliva or mucus
Which of the following is NOT a political or societal factor that might lead to emerging disease…
microbial evolution
When an infectious disease cannot spread in a population because it lacks a significant number of susceptible hosts, the phenomenon is referred to as…
herd immunity
LPS is found in the outer membrane of gram neg bacteria
- T/F
True
Lysosomes are bags of digestive enzymes found in prokaryotic cells
- T/F
False
The resolving power of a microscope is described as the ability of the microscope to…
separate two objects that are very close together
The cytoplasmic membrane of BOTH eukaryotes and prokaryotes functions to…
Regulates movement of molecules that enter and leave the cell
