Exam 1 Flashcards
Wireless surface proteins and spikes playing important role in how
Viruses attached to cells
Which of the following microbial groups besides eubacteria have prokaryotic cell structure
Archaea
Which of the following would is a primary reason as to why gram-positive cell walls withstand significantly more pressure than gram-negative cell walls.
Gram-positive cells walls contain multiple peptidoglycan layers
You do a throat swab from a patient with strep throat and performing Gram stain on it. On the microscope you see causative agent Streptococcus pyrogenes. Describe what you were looking at
Gram-positive spherical shaped cells in chains
The true phylogenetic tree of life which divides organisms into three domains eubacteria, Arkie bacteria and you eukarya based on
The relatedness of 16 S ribosomal RNA genetic sequences
Some bacteria are considered pleomorphic, which means they have no defined shape. The reason some bacteria are pleomorphic is due to
The lack of cell wall
How does a bacterium control the direction of motility
The bacteria stops and randomly spins if not going the right direction
What is the purpose of bacterial endospores
Lower back to him to survive harsh conditions
A benefit of using plate counts to quantify microorganisms in a sample is that
It is a viable count
The cell membranes of Archaebacteria are different from cell membranes of eubacteria by all the following except
These use cholesterol for stabilization
Which of the following best describes Archea domain of life?
Prokaryotes living in environments of extreme temp, pH, or other unusual environmental conditions
Substances in the cell wall of some bacteria that will cause severe symptoms if released into the bloodstream
LPS
Although prokaryotic cells do not contain organelles, some may store various substances in internal structures called
Vacuoles
The presence of D amino acids In the cross-links of the peptidoglycan layer is most likely because
Most peptidases and the environment can only cleave L amino acids
The third amino acid in the peptidoglycan cross-linking chain is either lysine or modify form of lysine known as Diaminopimilic acid because this amino acid must
Have a free amine group on the R side chain to form a peptide bond
Which of the following is not true about capsules and slime layers
They are absolutely required for growth on laboratory media
Which of the following would work best to quantify organisms in a relatively dilute sample
Filtration followed by colony counts
Capsomeres are proteins which form the viral capsid. What is the rule of these proteins
You protect the genome from environmental conditions
Bacteria are classified in the same genus species format used for other organisms: however, we must further classify them below the species level using a stain designation… What does the O designation represent
The type of oligosaccharide in LPS
For viral infections, trophism is most often dependent upon this step of the infection cycle
Attachment
Which of the following organisms does not always dividing the same plane but instead has random division planes causing a cluster like arrangement
Staphylococcus epidermidis
Which of the following statements about bacterial Is incorrect
Maybe used for motility
Controls directional flagellar rotation depending on if phosphorylated or not
CheY
Combined with calcium creates a strong protective spore coat
Dipicolinic acid
