Exam 1

Question 0

Wireless surface proteins and spikes playing important role in how

Answer 0

Viruses attached to cells

Question 1

Which of the following microbial groups besides eubacteria have prokaryotic cell structure

Answer 1

Archaea

Question 2

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.

Answer 2

Gram-positive cells walls contain multiple peptidoglycan layers

Question 3

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

Answer 3

Gram-positive spherical shaped cells in chains

Question 4

The true phylogenetic tree of life which divides organisms into three domains eubacteria, Arkie bacteria and you eukarya based on

Answer 4

The relatedness of 16 S ribosomal RNA genetic sequences

Question 5

Some bacteria are considered pleomorphic, which means they have no defined shape. The reason some bacteria are pleomorphic is due to

Answer 5

The lack of cell wall

Question 6

How does a bacterium control the direction of motility

Answer 6

The bacteria stops and randomly spins if not going the right direction

Question 7

What is the purpose of bacterial endospores

Answer 7

Lower back to him to survive harsh conditions

Question 8

A benefit of using plate counts to quantify microorganisms in a sample is that

Answer 8

It is a viable count

Question 9

The cell membranes of Archaebacteria are different from cell membranes of eubacteria by all the following except

Answer 9

These use cholesterol for stabilization

Question 10

Which of the following best describes Archea domain of life?

Answer 10

Prokaryotes living in environments of extreme temp, pH, or other unusual environmental conditions

Question 11

Substances in the cell wall of some bacteria that will cause severe symptoms if released into the bloodstream

Answer 11

LPS

Question 12

Although prokaryotic cells do not contain organelles, some may store various substances in internal structures called

Answer 12

Vacuoles

Question 13

The presence of D amino acids In the cross-links of the peptidoglycan layer is most likely because

Answer 13

Most peptidases and the environment can only cleave L amino acids

Question 14

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

Answer 14

Have a free amine group on the R side chain to form a peptide bond

Question 15

Which of the following is not true about capsules and slime layers

Answer 15

They are absolutely required for growth on laboratory media

Question 16

Which of the following would work best to quantify organisms in a relatively dilute sample

Answer 16

Filtration followed by colony counts

Question 17

Capsomeres are proteins which form the viral capsid. What is the rule of these proteins

Answer 17

You protect the genome from environmental conditions

Question 18

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

Answer 18

The type of oligosaccharide in LPS

Question 19

For viral infections, trophism is most often dependent upon this step of the infection cycle

Answer 19

Attachment

Question 20

Which of the following organisms does not always dividing the same plane but instead has random division planes causing a cluster like arrangement

Answer 20

Staphylococcus epidermidis

Question 21

Which of the following statements about bacterial Is incorrect

Answer 21

Maybe used for motility

Question 22

Controls directional flagellar rotation depending on if phosphorylated or not

Answer 22

CheY

Question 23

Combined with calcium creates a strong protective spore coat

Answer 23

Dipicolinic acid

Question 24

Cytoskeleton protein involved in that placement of the division plane in bacteria

Answer 24

FtsZ

Question 25

Forms tight complexes with the DNA in endospores protecting from damage

Answer 25

Small acid soluble protein SASP

Question 26

Carries peptidoglycan precursors inside the cell to cell membrane

Answer 26

Bactoprenol

Question 27

Links the terminal alanine of one peptidoglycan precursor to the lysine or modified lysine on another peptidoglycan precursor

Answer 27

UDP