Please help with the attached micro questions. Several questions have not been answered as I cannot find anything referring to the topic in my text.
1. Passive immunity can
a. Involved an injection of antibodies
b. Be acquired by a child from its mother
c. Be administered with a convalescent serum
d. All the above are correct
6. In the secondary anamnestic response
a. The booster injection stimulates an immediate antibody response
b. Phagocytosis is stimulated by lymphokines
c. The body is exposed to antibodies
d. Polyvalent serum is injected to the body
7. An example of a second generation vaccine is that for
a. Measles, mumps and rubella
c. Diphtheria and tetanus
d. Streptococcal pneumonia
8. Antibodies produced against bacterial pili would inhibit
a. Capsular polysaccharide production
b. Penetration of bacteria through human tissues
c. Bacterial motion
d. Attachment of bacteria to human tissue
11. When the immune system recognizes a foreign protein in a serum injection and complement is activated, a person may develop a type of allergy called
a. Immune complex disease
d. Serum Sickness
15. Innate immunity is the same as
a. Natural passive immunity
b. Acquired active immunity
c. Nonspecific defense
d. Specific immunity
23. The antigenic substance that sets off an anaphylactic reaction
a. Interacts with the body's T-Lymphocytes
b. Is known as an allergen
c. Induces smooth muscle contraction directly
d. Contains cyclic AMP molecules
28. The major histocompatibility genes encode
a. The individual's blood type
b. The development of the Rh antigen
c. A series of cell-surface antigens
d. The mediators that develop in anaphylaxis
30. If a woman with blood type A+ has a child by a man whose blood type is A-
a. The child will have type B blood
b. Hemolytic disease will occur in the second child to be conceived
c. The child will not suffer from hemolytic disease nor will a future child
d. The woman will develop Rh antibodies at the conclusion of pregnancy
34. In a blood transfusion, the
a. Recipient should not contain antibodies to the donor's antigens
b. Recipient should not contain antigens to the donor's antibodies
c. Recipient should not contain antigens or antibodies cross-reactive to the donor's
d. All the above are correct
43. The indicator system in the complement fixation test is used to determine whether complement was used up in the test system
45. In the preparation of toxoids, the antigenicity of the toxin remains while the toxigenicity is destroyed
47. The application of the ELISA test is in the AIDS test for the detection of HIV antigens.
48. Immunizing agents include toxoids, subunit vaccines containing parts of microorganisms, and synthetic vaccines such as that used for hepatitis B
Please see attachment for answers and explanations.
Microbiology Questions- Direct and Viable Counts
The depth of the hemocytometer sample box is 0.1mm for all questions.
Please show all calculations.
1. Why might the direct and variable counts of a suspension disagree?
2. You dilute an original sample 1:30. You then count the number of yeast in the 1:30 dilution. You count an average of 7 cells in the 1/25 mm^2 sized boxes. What is the density, in cells/ml, of the original sample?
3. You count the number of bacteria in 5 of the 1/400 mm^2 boxes of the central grid on the hemocytometer. Your results are: 12 cells in box #1, 17 cells in box #2, 17 cells in box #3, 14 cells in box #4 and 16 cells in box #5. You are counting a 1:10 dilution of the original sample. What is the density of the original culture (in cells/ml)?