Midterm Flashcards
Bacteria and archea are the only organisms characterized as
Prokaryotic
Bacteria can be classified according to their
Type of cell walls, methods of obtaining energy, gram stain
When tested with gram stain, gram positive are…
Purple
Bacteria lack a true nucleus and membrane bound organelles therefore they are classified as
Prokaryotes
One difference between human body cells and bacterial cells is that bacterial cells have
A cell wall made of peptidoglyn
Structures found in a eukaryotic cell but not in a bacterial cell
Cell nuclei, multiple chromosomes, membrane bound organelles
Found In cytoplasm of bacterial cell
None of above
Bacterial cells
Have cell membrane and wall
E. coli and other bacteria have in common with eukaryotes
DNA
Bacterial endpapers
Allow certain species to survive harsh conditions
Used at least by some bacteria for movement
Flagella
Conditions unsuitable for bacteria to grow
None of the above
Prokaryotes transfer pieces of genetic info by a process called
Conjugation
A pathogen is an agent that is
Harmful to living organisms
Food not a product of fermentation
Milk
Antibiotics
Include penicillin and tetracycline, prevent bacteria from making new cell walls, effective treatment for bacterial disease
Not habitat of archea
Human skin
Not a way of preventing food borne illness at home
Washing kitchen utinsils thouroughly in cold water
Viruses are considered non living because
Cannot: reproduce by themselves nor carry out metabolism
Not made up of cells
Study of viruses is part of biology bc
They are active inside living cells
Biologists know that viruses
Contain RNA or DNA In a protein or lipid coat
The capsid of a virus is the
Protective outer coat
All viruses have
None of the above
Tobacco mosaic virus
Able to be crystallized,causes disease in tobacco plants, smaller than bacterium.
Scientists first began to study viruses because
Couldn’t be seen but caused disease
Viruses that use reverse transcriptase…..called
Retrovirus
Contains RNA only
Viroid
Unlike viruses, prions
Composed only of protein
Typical virus consists of
A protein coat and a nucleus acid core
Viruses
Reproduce only in living cells
Animal viruses often infect only specific host cells because
The host cell must have specific receptors for proteins on the virus surface