TEST 2 CARDS

Question 1

medium 1 is ___

Answer 1

both

Question 2

Medium 2 is ___

Answer 2

selective

Question 3

The antifungals polyenes and azoles are used to treat fungal infections by

Answer 3

effecting sterols in plasma membrane

Question 4

Which of the following is not a characteristic of biofilms

Answer 4

monolayer

Question 5

Which of the following choices best describes the optimum growth temperature of mesophiles

Answer 5

25-40 celsius

Question 6

Plasmolysis occurs in what type of solution and why?

Answer 6

Hypertonic solution; water leaves the cell

Question 7

What element is the structural backbone of organic molecules

Answer 7

carbon

Question 8

What kind of media should be used to culture fastidious, autotrophic bacteria?

Answer 8

Chemically defined media

Question 9

Which group of microorganisms causes food spoilage?

Answer 9

psychotrophs

Question 10

What enzyme catalayzes the joining of strands during crossing over?

Answer 10

RecA

Question 11

Which of the following microbial control agents is used to treat infections of gram negative bacteria and pseudomonas spp?

Answer 11

polymyxin B

Question 12

Which one of the following is not a form of ionizing radiation

Answer 12

UV

Question 13

Which of the following is not a method of disinfection

Answer 13

all of the above

Question 14

Is the minimal time for all bacteria in a liquid to be killed at a particular temp?

Answer 14

thermal death time

Question 15

Which formula accuratley describes bacterial growth?

Answer 15

2 x 2 (24)

Question 16

WHat type of chemical dentatures proteins, dissolves lipids, no efect on endospores?

Answer 16

alcohol

Question 17

What chemical cross links with functional groups?

Answer 17

aldehydes

Question 18

Surgical hand scrubs?

Answer 18

biguadines

Question 19

Which chemical is used as gaseous sterilant?

Answer 19

ethylene oxide

Question 20

Which microbial control agent reduces microbial numbers by disrupting lipids in plasma membrane?

Answer 20

phenols

Question 21

Which of the followign bases are pyrimidnes?

Answer 21

thymine and cytosine

Question 22

What is this ATUTAC

Answer 22

nothing

Question 23

Complementary base pairs are stabilized by?

Answer 23

hydrogen bonds

Question 24

What component of DNA stores information?

Answer 24

the base

Question 25

What describes the lac operon?

Answer 25

When lactose is present, it binds with a repressor protein, keeping it from binding to the operator

Question 26

Constituitve genes are NOT transcribed unless inducer is present

Answer 26

false

Question 27

Which of the following is not a method of horizontal gene transfer?

Answer 27

binary fission

Question 28

Which choice below best describes the genetic recombinant transduction?

Answer 28

Dna transferred from donor to recipient by bacteriophage

Question 29

Best describes conjugation?

Answer 29

none of the above

Question 30

What type of mutation causes a base subsitution?

Answer 30

missense mutation

Question 31

Broad spectruym antibiotic

Answer 31

streptomycin

Question 32

Alternative to penicillin

Answer 32

erythromycin

Question 33

Broad spectrum antibiotic

Answer 33

streptomycin

Question 34

Inhibits RNA synthesis in fungi

Answer 34

flucytosine

Question 35

Chemical inhibits DNA synthesis

Answer 35

Quinolones

Question 36

Enzyme that removes introns

Answer 36

ribozyme

Question 37

Makes covalent bond to join DNA strands

Answer 37

dna ligase

Question 38

Cuts DNA backbone in a strand of DNA

Answer 38

endonuclease

Question 39

Breaks hydrogen bonds between dna base pairs

Answer 39

helicase

Question 40

Low temperature has effect on what bacteria?

Answer 40

bacteriostatic

Question 41

What % of bacteria cell is composed of water?

Answer 41

80-90%

Question 42

What organisms require high osmotic pressure?

Answer 42

Obligate halophile

Question 43

What enzyme proofreads and repairs DNA?

Answer 43

DNA polymerase