. Molecular biology

83. Molecular biology is the study ofA) 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 onA) cell morphology.B) Gram reaction.C) rRNA sequences.D) habitat.E) diseases87. Which of the following statements is a reason for NOT classifying viruses in one of threedomains ?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 cell89. Which of the following best defines a strain?A) a pure culture that is not totally identical to other cultures of the same speciesB) a group of organisms with a limited geographical distributionC) a population of cells with similar characteristicsD) a group of cells derived from a single parent1. If the alcohol wash was omitted in the gram-staining procedure the gram positive bacteria would appear:a. Purpleb. Pinkc. Colorlessd. None of the above6. Viruses are not considered living organisms because theyA) 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 RNAb. The core membrane surrounds the coatc. The coat conveys chemical resistanced. Exist only free in the environmente. C and D7. Classification of organisms into three domains is based onA) the presence of a cell wall.B) the number of cells in the organism.C) cellular organization.D) nutritional requirements8. Biogenesis refers to theA) 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. Catalaseb. Peroxidasec. Superoxide dismutased. All of the abovee. A and Bf. B and C25. 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 bacteriaC) Normal microbiota: organisms naturally occurring on the body.D) Emerging Infectious Disease; Bird Flu.E) Gene therapy: study of the function of genes.