Midterm 1 Mistakes Flashcards
what is a bacillus?
rod shaped bateria
The significance of the plasma membrane is that? (3)
it selectively allows some molecules to pass into the organism
it prevents movement of molecules out of the organism
Plasmids are important to the genetics of many bacteria. This is because
A) they are inherited from one generation to the next.
B) they may carry genes that give their host a selective advantage. C) they can render bacteria drug-resistant.
Some bacteria are considered pleomorphic. This means
they do not have just one shape
Magnetostomes in bacteria ___
help cells to orient in the earth’s magnetic field.
The presence of D-amino acids in the crosslinks of the peptidoglycan layer is most likely because
most peptidases can only cleave L-amino acids.
The third amino acid in the peptidoglycan crosslinking chain is either diaminopimilic acid or lysine because this amino acid must
be positively charged for a salt bridge to form.
Which of the following is not true about capsules and slime layers?
They are required for bacteria to grow normally in culture.
A bacillus bacterium with a single flagellum at each end is described as
amphitrichous
A bacillus bacterium with multiple flagellum is described as
peritrichous
A bacillus bacterium with a single flagellum at one end is described as
mono
A bacillus bacterium with MULTIPLE flagellum at one end is described as
polar/lopho
The flagellar filament grows by what? Is it easily reparable?
self-assembly of subunits traveling through the hollow flagellum to the tip.
Yes, easily reparable since assembled tips first.
How does a bacterium control the direction of swimming?
It does not control the direction
Bacteria accomplish chemotaxis by
Making long, uninterrupted runs when conditions are good.
