BIO250 exam 4 (A+++++ Answer)

Question 1

Keratin is an important aspect of non-specific defense because

Select one:

a. It is toxic to pathogens

b. It creates a physical barrier against pathogens

c. It destroys pathogens

d. It physically restricts pathogens to a specific region

e. None of the choices are correct

Question 2

Which antimicrobial does not interfere with protein synthesis?

Select one:

a. Aminoglycosides

b. Tetracyclines

c. Erythromycin

d. Trimethroprim

e. Chloramphenicol

Question 3

Which is mismatched?

Select one:

a. Fimbriae - adherence to substrate

b. Capsules – antiphagocytic factor

c. Coagulase - dissolve fibrin clots

d. Leukocidins - damage white blood cells

e. Hemolysins - damage red blood cells

Question 4

The embryonic yolk sac, the liver and the bone marrow are sites where

Select one:

a. Immune responses to antigen occur

b. Stem cells give rise to immature lymphocytes

c. Antigen is filtered from the blood

d. Antigen is filtered from tissue fluid

e. T lymphocytes complete maturation

Question 5

Infections that go unnoticed because there are no symptoms are called

Select one:

a. Syndromes

b. Malaise

c. Inflammation

d. Asymptomatic

e. Secondary infection

Question 6

Which of the following is incorrect about blood cells?

Select one:

a. After birth produced in red bone marrow sites

b. Develop from undifferentiated stem cells

c. Include mast cells

d. Include leukocytes that are either granulocytes or agranulocytes

e. Include erythrocytes that, when mature, lose their nuclei

Question 7

The dried residues of fine droplets from mucus or saliva that harbor and transmit pathogen are

Select one:

a. Fomites

b. Aerosols

c. Mechanical vectors

d. Droplet nuclei

e. Biological vectors

Question 8

Which of the following is not a primary target of milk pasteurization?

Select one:

a. Salmonella

b. Campylobacter jejuni

c. Lactobacilli

d. Listeria monocytogenes

e. Brucella

Question 9

The process of using a cleansing technique to mechanically remove and reduce microorganisms and debris to safe levels is

Select one:

a. Disinfection

b. Sterilization

c. Antisepsis

d. Sanitization

e. Degermation

Question 10

Transfusion of the wrong blood type can cause

Select one:

a. Recipient antibody activating the complement cascade to attack the RBCs

b. Fever and anemia

c. Systemic shock and kidney failure

d. Massive hemolysis of the donor RBCs

e. All of the choices are correct

Question 11

The molecular fragment on an antigen molecule that a lymphocyte recognizes and responds to is called a/an

Select one:

a. Epitope

b. Hapten

c. Antigen binding site

d. Variable region

e. None of the choices are correct

Question 12

A person who has anti A and anti B serum antibodies will have blood type

Select one:

a. A

b. B

c. AB

d. O

e. Rh

Question 13

Which test is used to diagnose polio?

Select one:

a. ELISA

b. Western blot

c. Widal test

d. Complement fixation

e. VRDL

Question 14

The Western blot test is confirmatory for HIV because

Select one:

a. It is more sensitive than the ELISA

b. It has fewer false positives than the ELISA

c. It tests for more HIV antibodies than ELISA

d. It is easier to interpret than ELISA

e. All of the choices are correct

Question 15

Precipitation tests involve all the following except

Select one:

a. They rely on formation of visible clumps for detection

b. They include the VDRL test for syphilis

c. They are often performed in agar gels

d. They can be done in a test tube by carefully adding antiserum over antigen solution

e. A cloudy or opaque zone developing where antigen and antibody react

Question 16

_____ function in humoral immunity, while _____ function in cell-mediated immunity.

Select one:

a. B cells, T cells

b. T cells, B cells

c. Monocytes, Basophils

d. Basophils, T cells

e. B cells, neutrophils

Question 17

Drugs that act by mimicking the normal substrate of an enzyme, thereby blocking its active site, are called

Select one:

a. Inhibitors

b. Blockers

c. Competitive inhibitors

d. Non-competitive inhibitors

e. None of the choices are correct

Question 18

The potential for hemolytic disease of the newborn occurs when

Select one:

a. Maternal Rh+ cells enter an Rh- fetus

b. Fetal Rh+ cells enter an Rh- mother

c. Maternal Rh- cells enter an Rh+ fetus

d. Fetal Rh- cells enter an Rh+ mother

e. Fetal Rh+ cells enter an Rh+ mother

Question 19

Destruction of lymphocytes with self-specificity is called

Select one:

a. Immune tolerance

b. Proliferation

c. Clonal selection

d. Differentiation

e. Hypersensitivity

Question 20

What drug is used in cases of penicillin and methicillin resistance and also used to treat endocarditis?

Select one:

a. Penicillin G

b. Vancomycin

c. Tetracycline

d. Erythromycin

e. Isoniazid