Exam 2 Flashcards
studying
viruses are characterized by all of the following except
being capable of independent reproduction
phages are viruses that can infect
bacteria
which cells does HIV primarily attack
CD4 T cells
Cell stress can induce the formation of proteases that degrade the repressor. What will result?
the virus will enter the lysogenic cycle
what is the primary difference between the lytic and lysogenic cycles in bacteriophages?
the lytic cycle kills the host cell while the lysogenic cycle intergrates the viral DNA into the host genome
Gardasil is marketed as a cervical cancer vaccine, but it is actually a human papilloma virus (HPV) vaccine. Why is this done?
cancer cells are particularly susceptible to viral infection
which of the following is a trait that a virus shares with a living organism
they have genetic material
what is the primary characteristic of a prion
it is a misfold protein that can induce other proteins to misfold
during the replication of a viral genome, what is the role of the host cell’s machinery?
it is used to replicate and transcribe the viral genome
the direction of genetic information transfer in a retrovirus (such as HIV) is
RNA to DNA to mRNA to protein
if the label on a slide reads gram-positive bacillus what would a students expect to see
purple rod shaped cells
why is chlamydia much more common than syphilis
many chlamydia infecitons are asymptomatic
during transformation, how do bacteria incorporate foreign DNA
by taking up DNA from their surrounding environments
certain prokaryotes can withstand drying and hotter temperatures because of their ability to form
endospores
the prokaryotic DNA is located in the
nucleoid region
