Which of the following best defines a strain?

Molecular biology is the study of

A) DNA synthesis.

B) RNA replication.

C) protein synthesis.

D) enzyme function.

E) the structure and function of macromolecules essential to life.

86. The phylogenetic classification of bacteria is based on

A) cell morphology.

B) Gram reaction.

C) rRNA sequences.

D) habitat.

E) diseases

87. Which of the following statements is a reason for NOT classifying viruses in one of three

domains ?

A) Some viruses can incorporate their genome into a host’s genome.

B) Viruses direct anabolic pathways of host cells.

C) Viruses are obligate parasites.

D) Viruses are not composed of cell

89. Which of the following best defines a strain?

A) a pure culture that is not totally identical to other cultures of the same species

B) a group of organisms with a limited geographical distribution

C) a population of cells with similar characteristics

D) a group of cells derived from a single parent

1. If the alcohol wash was omitted in the gram-staining procedure the gram positive bacteria would appear:
a. Purple
b. Pink
c. Colorless
d. None of the above
6. Viruses are not considered living organisms because they

A) cannot reproduce by themselves.

B) are structurally very simple.

C) can only be visualized using an electron microscope.

D) typically associated with disease.

5. 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
7. 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

8. Biogenesis refers to the

A) spontaneous generation of organisms from nonliving matter.

B) development of life forms from preexisting life forms.

C) development of aseptic technique.

D) germ theory of disease.

20. Which of the following enzymes is used to break down hydrogen peroxide?
a. Catalase
b. Peroxidase
c. Superoxide dismutase
d. All of the above
e. A and B
f. B and C
25. 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.

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