CLS MICRO – In gram staining the stabilizing mordant

15 Jun CLS MICRO – In gram staining the stabilizing mordant

Question
In gram staining the stabilizing mordant is:
Alcohol
Gram’s iodine
Water
None of the above

1. Which is the correct size of the following from SMALLEST TO LARGEST:
a. Virus, b. skin cell, c. bacterial cell, d. yeast cell
a. a,b,c,d
b. c,a,d,b
c. a,c,d,b
b. b,d,c,a

2. Bacterial spores:
a. Have a core that contains RNA
b. The core membrane surrounds the coat
c. The coat conveys chemical resistance
d. Exist only free in the environment
e. C and D

3. Classification of organisms into three domains is based on

A) the presence of a cell wall.

B) the number of cells in the organism.

C) cellular organization.

D) nutritional requirements.

4. Antibiotics are produced by

A) viruses.

B) bacteria.

C) protozoa.

D) fungi.

E) bacteria and fungi.

5. Which of the following are mismatched?

A) Recombinant DNA: DNA resulting when animal genes are inserted in a bacterial genome.

B) Bioremediation: remove toxic waste using bacteria

C) Normal microbiota: organisms naturally occurring on the body.

D) Emerging Infectious Disease; Bird Flu.

E) Gene therapy: study of the function of genes.

6. Which of the following are reasons why Penicillin was considered a “miracle drug”?

A) Ehrlich discovered it and used it as a model for his theory of a magic bullet

B) It does not affect eukaryotic cells.

C) Effects Gram positive microbial growth

D) Both B and C

E) A, B and C.

7. A DNA plasmid encoding a protein antigen from West Nile virus is injected into muscle cells of a horse. This is an example of a(n)

A) nucleic acid vaccine.

B) subunit vaccine.

C) attenuated whole-agent vaccine.

D) live whole-agent vaccine.

E) conjugated vaccine.

8. Which of the following can be used to inactivate a virus?

A) Alcohols

B) Heavy metals

C) A cocktail of streptomycin and chloramphenicol

D) Both A and B

E) A, B and C

9. Which of the following is most likely a product of an early gene?

A) capsid proteins B) DNA polymerase

C) spike proteins D) envelope proteins

10. A patient shows the presence of antibodies against diphtheria toxin. Which of the following statements is FALSE?

A) The patient may have been vaccinated.

B) The patient may have the disease.

C) The patient was near someone who had the disease.

D) The patient may have had the disease and has recovered.

E) A recent transfusion may have passively introduced the antibodies

11. Which of the following is /are a reservoir of infection?
a. a sick animal
b. a healthy person
c. a sick person
d. a hospital
e. All of these can be reservoirs of infection.