Test 4

Question 1

Tc cell differs from Th cell in that

Answer 1

Tc cell once activated will search for infected cells to destroy while Th cells activate other immune cells in response.

Question 2

Selective toxicity

Answer 2

target pathogens leave host cells unharmed

Question 3

which most likely accounts for antibiotic resistance?

Answer 3

indiscriminate use of antibiotics

Question 4

mechanisms of action of antibiotics?

Answer 4

interfere with cell wall synthesis
interfere will protein synthesis
interfere with nucleic acid synthesis

Question 5

antibiotic in animal feed leads to antibiotic resistance in bacteria because

Answer 5

antibiotic kills susceptible bacteria but few that are naturally resistant live and reproduce and their progeny repopulate the host cell

Question 6

best describe definition of virulence for pathogen

Answer 6

ability to invade, spread, establish an infection, damage it causes doing so

Question 7

sequence reaction initiated after a phagocytic cell engulfs invading microbes

Answer 7

complement cascade

Question 8

which of these immune responses may directly contribute to bacterial endotoxin release by cell lysis?

Answer 8

MAC formation

Question 9

During what viral processes does a point mutation occur that contribute to the antigenic DRIFT?

Answer 9

translation by host ribosome

Question 10

benefit of normal microbiota

Answer 10

competition for nutrition against pathogen

Question 11

recognized or classified as a PAMP recognized by PRR

Answer 11

G+ teichoic acid
G- LPS
RNA double stranded viral genome

Question 12

adaptive immune system activity

Answer 12

occurs in lymph nodes

Question 13

how does MAC affect G- cells?

Answer 13

G- cells have outer membrane that is targeted by MAC

Question 14

classified as opsonin

Answer 14

antibody

Question 15

a single antibody can bind to any antigen

Answer 15

false

Question 16

get bitten by a bug and gets yellow fever and has not been vaccinated. What type of immune defense against pathogen during first week of infection?

Answer 16

innate because it will react to the first time infected

Question 17

IgA transferred thru breast milk absorbed into the blood but present in the mucus membrane to protect the infant. since phagocytes and complement proteins do not reside in mucus. What is the main function of IgA antibody?

Answer 17

prevention of attachment

Question 18

MCH I was prevented from being displayed on the cell surface. What would be the result?

Answer 18

Tc cell would not monitor the cell for infection

NK would identify the lack of MHC I and kill the cell

Question 19

What is not true of memory cells?

Answer 19

memory cells are NK cells

Question 20

ability of population to resist severe epidemic b.c of significant proportion of its

Answer 20

herd immunity

Question 21

which one of this is not a professional APC?

Answer 21

NR cell (does she mean NK cell?)

Question 22

Humoral immunity is carried out by __ while cell-mediated immunity is mainly carried out by ___

Answer 22

B cell; T cell

Question 23

Not an example of host’s innate protection against microbial invasion

Answer 23

antibodies

Question 24

Mutation occurs that knocks out formation of complement protein C3b. Which of the following activities would be less effective?

Answer 24

complement activation

opsonization