Attributes Of Living Systems
(BIOL 105) Exam 2 with 100%
correct answers (graded A+)
Virion - answer metabolically inert extracellular virus particle
What is a bacteriophage - answer Viruses that infect bacteria
Why are phages a major component of the human virome? - answer They
keep bacteria in check and prevent overgrowth
Viruses can be - answer ssRNA, dsRNA, ssDNA, or dsDNA
How are retroviruses unique? - answer only found in animals
Capsid - answer Protein coat, made up of capsomeres
Envelope of virus - answer some animal viruses have a membrane around
nucleocapsid; lipid bilayer with protein embedded
Why do viruses have a limited number of host species they can infect? -
answer Certain receptors are unique for certain cells
Zoonosis - answer Transmission of disease from animals to humans
What is a key step required for a virus to infect a host cell? - answer Binding
to a receptor
, How do viruses make new viruses once it has penetrated the host cell? -
answer Hijacks the cell to make more viruses
Viroids - answer "naked" RNA, no proteins are coded for, common in plants
and usually spread by insects
Prions - answer entirely made up of proteins; no immune response against
prions and no treatment known
Responsible for scrapie in sheep, bovine spongiform encephalopathy,
Creutzfeldt-Jakob Disease in humans
What are the effects of a prion on the organism? - answer refolds all of the
DNA in the brain
Phospholipids bilayer - answer Membrane around a cell
Why is it called a "fluid mosaic model" - answer Not solid and constantly
moving
1st Function of Phospholipid bilayer - answer Limits what comes in and out
What does transport depend on? - answer Size of molecule and charge
2nd Function of Phospholipid Bilayer? - answer Anchor site for membrane
proteins
What are the function of membrane proteins? - answer transport, enzymatic
activity, signal transduction, cell-cell recognition, intercellular joining,
attachment to cytoskeleton and ECM
(BIOL 105) Exam 2 with 100%
correct answers (graded A+)
Virion - answer metabolically inert extracellular virus particle
What is a bacteriophage - answer Viruses that infect bacteria
Why are phages a major component of the human virome? - answer They
keep bacteria in check and prevent overgrowth
Viruses can be - answer ssRNA, dsRNA, ssDNA, or dsDNA
How are retroviruses unique? - answer only found in animals
Capsid - answer Protein coat, made up of capsomeres
Envelope of virus - answer some animal viruses have a membrane around
nucleocapsid; lipid bilayer with protein embedded
Why do viruses have a limited number of host species they can infect? -
answer Certain receptors are unique for certain cells
Zoonosis - answer Transmission of disease from animals to humans
What is a key step required for a virus to infect a host cell? - answer Binding
to a receptor
, How do viruses make new viruses once it has penetrated the host cell? -
answer Hijacks the cell to make more viruses
Viroids - answer "naked" RNA, no proteins are coded for, common in plants
and usually spread by insects
Prions - answer entirely made up of proteins; no immune response against
prions and no treatment known
Responsible for scrapie in sheep, bovine spongiform encephalopathy,
Creutzfeldt-Jakob Disease in humans
What are the effects of a prion on the organism? - answer refolds all of the
DNA in the brain
Phospholipids bilayer - answer Membrane around a cell
Why is it called a "fluid mosaic model" - answer Not solid and constantly
moving
1st Function of Phospholipid bilayer - answer Limits what comes in and out
What does transport depend on? - answer Size of molecule and charge
2nd Function of Phospholipid Bilayer? - answer Anchor site for membrane
proteins
What are the function of membrane proteins? - answer transport, enzymatic
activity, signal transduction, cell-cell recognition, intercellular joining,
attachment to cytoskeleton and ECM
