Practice Exam 3-1 - BIOL 2013

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The enzyme that is responsible for synthesizing RNA is

a. DNA phosphorylase.
b. Transcriptase.
c. DNA ligase.
d. RNA ligase.
e. DNA synthase.
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The enzyme that is responsible for synthesizing RNA is

a. DNA phosphorylase.
b. Transcriptase.
c. DNA ligase.
d. RNA ligase.
e. DNA synthase.
b. Transcriptase.
DNA DIRECTLY participates in which of the following?

a. Replication, transcription and translation
b. Conservative replication
c. Transcription and translation
d. Replication and transcription
e. None of the above.
d. Replication and transcription
Genetics and metabolism are tied together by the fact that

a. The genes code for phenotypic characteristics that result in proteins being produced.
b. The genes code for enzymes that catalyze reactions that result in characteristics.
c. The proteins code for genes that result in enzymes that catalyze reactions.
d. The enzymes catalyze reactions that produce proteins.
e. None of the above.
b. The genes code for enzymes that catalyze reactions that result in characteristics.
All of the following bases are found in RNA except

a. Adenine.
b. Cytosine.
c. Guanine.
d. Thymine.
e. Uracil.
d. Thymine.
A silent mutation is

a. Always a change in base sequence and sometimes a change in amino acid sequence.
b. Always a change in base sequence and always a change in amino acid sequence.
c. Sometimes a change in base sequence and always a change in amino acid sequence.
d. Sometimes a change in base sequence and sometimes a change in amino acid sequence.
e. None of the above.
a. Always a change in base sequence and sometimes a change in amino acid sequence.
The codon, UGA, would function as a stop codon on

a. tRNA.
b. mRNA.
c. rRNA.
d. All of the above.
e. None of the above.
b. mRNA.
Which would be a product of translation?

a. A new strand of DNA
b. rRNA
c. tRNA
d. A protein (polypeptide).
e. None of the above.
d. A protein (polypeptide).
Which require(s) living donor and recipient cells?

a. Conjugation only
b. Conjugation and transformation
c. Transformation only
d. Conjugation and transduction
e. Transduction only
a. Conjugation only
Erectile dysfunction can be caused by

a. Carboxide.
b. Ultraviolet light.
c. Caffeine.
d. Cigarette smoke.
e. All of the above.
d. Cigarette smoke.
The following use(s) sex pheromones.

a. Gram negative conjugation
b. Gram positive conjugation
c. Gram negative and Gram positive conjugation
d. Transformation
e. Transduction
b. Gram positive conjugation
Which of the following is due to a mistake in packaging of DNA? a. Transformation b. Transduction c. Conjugation d. Translation e. None of the aboveb. TransductionChemicals in cigarette smoke that selectively cause cells with a mutation to replicate more than cells without a mutation are called a. Initiators. b. Promoters. c. Inducers. d. Inhibitors. e. None of the above.b. Promoters.Restriction enzymes are important because they a. Function in protein synthesis. b. Generate overlapping sticky ends on DNA. c. Cause cells to become competent for transformation. d. Are responsible for conjugation. e. None of the above.b. Generate overlapping sticky ends on DNA.A method of one-way gene transfer that requires cell-to-cell contact is a. Transformation. b. Conjugation. c. Transduction. d. Transcription. e. Translation.b. Conjugation.Which are not Methods of Sterilization? a. Autoclave and oven b. Oven and filtration c. Pasteurization and lyophilization d. Filtration and incineration e. Incineration and ovenc. Pasteurization and lyophilizationEndospores have resistance to some levels of ionizing radiation because they are a. Lyophilized. b. Desiccated. c. Heat-resistant. d. Resistant to freezing. e. All of the above.b. Desiccated.If you were asked to sterilize a heat-sensitive item (and not cause damage to the item), which of the following would be most suitable? a. Autoclave b. Pasteurization c. Ethylene oxide (carboxide) d. Ethyl alcohol e. Ovenc. Ethylene oxide (carboxide)Membrane filtration a. Can be used to sterilize liquids and solids, but not gases. b. Does not necessarily remove viruses. c. Is the most common method to sterilize nutrient agar. d. Has not been used since Pasteur's time. e. None of the above.b. Does not necessarily remove viruses.Major targets for disinfectant action include a. Cell proteins and cell walls. b. Cell walls and cell membranes. c. Cell proteins, cell walls and cell membranes. d. Cell proteins and cell membranes. e. None of the above.d. Cell proteins and cell membranes.The most practical and efficient method of physical control is a. Filtration. b. Desiccation. c. Lyophilization. d. Osmotic pressure. e. Heat.e. Heat.Which term refers to a chemical that is used at safe levels in accordance with public health requirements? a. Antiseptic b. Antibiotic c. Sanitizer d. Chemically-synthesized chemotherapeutic agent e. None of the above.c. SanitizerThe chemical that is the active ingredient in Lysol is a. Cresol. b. Ethyl alcohol. c. Formaldehyde. d. Hydrogen peroxide. e. Bleach.a. Cresol.The difference between an antiseptic and a disinfectant is a. There is no difference. b. Only antiseptics are used to destroy or inhibit disease-causing organisms. c. Only disinfectants are used to destroy or inhibit disease-causing organisms. d. Disinfectants are typically used on the skin. e. Antiseptics are typically used on the skin.e. Antiseptics are typically used on the skin.Criteria for usefulness of an antimicrobial agent does NOT include a. Destruction of normal flora. b. Low in toxicity to host. c. Destroying or inhibiting disease organism. d. Host should not become allergic. e. Disease organism should not become resistant.a. Destruction of normal flora.A chemical that is not used much anymore because it is carcinogenic is a. Dial soap. b. Formaldehyde. c. Bleach. d. Ethylene oxide. e. Water.b. Formaldehyde.The most famous antibiotic, the first one discovered, one that inhibits bacterial cell wall synthesis, is a. Bacitracin. b. Penicillin. c. Sulfonamide. d. Chloramphenicol. e. Tetracycline.b. Penicillin.An example of a chemically-synthesized chemotherapeutic agent is a. Sulfonamide. b. Penicillin. c. Polymyxin B. d. Erythromycin. e. Cipro.a. Sulfonamide.An antibiotic (by definition) a. Is any chemical agent that is specific for bacteria. b. Is a chemical agent that is the product of some organism's metabolism. c. Is normally chemically-synthesized in the laboratory. d. All of the above. e. None of the above.b. Is a chemical agent that is the product of some organism's metabolism.For a non-growing (stationary-phase) bacterial culture, which should be most effective as an antimicrobial agent? a. Sulfanilamide b. Penicillin c. Polymyxin B d. Erythromycin e. Ciproc. Polymyxin BWhat is the drug of choice to treat anthrax? a. Sulfonamide b. Penicillin c. Polymyxin B d. Erythromycin e. Ciproe. CiproMeasures to minimize drug resistance include a. Discriminate use, drug dose high and combination of drugs. b. Indiscriminate use, drug dose high and one drug at a time. c. Discriminate use, drug dose low and combination of drugs. d. Indiscriminate use, drug dose high and combination of drugs. e. None of the above.a. Discriminate use, drug dose high and combination of drugs.Conceivably, the most common mechanism of microbial resistance is a. Blocking entry. b. Inactivating enzymes. c. Alteration of target molecule. d. Efflux of antibiotic. e. Influx of antibiotic.c. Alteration of target molecule.Many cases of the flu on a college campus would be referred to as a(n) a. Endemic. b. Epidemic. c. Pandemic. d. Mutation. e. None of the above.b. Epidemic.Which of the following is a factor in the development of disease? a. Number of pathogens b. Vector c. Ability to flourish outside of the body d. All of the above e. None of the aboved. All of the aboveCholera, a very serious disease in many areas of the world, is normally transmitted via the a. Respiratory tract. b. Gastrointestinal tract. c. Skin and mucous membranes. d. Genitourinary tract. e. Blood.b. Gastrointestinal tract.An example of a disease normally transmitted via the blood is a. Hepatitis. b. Acne. c. Flu. d. Common cold. e. Salmonella food poisoning.a. Hepatitis.A disease organism that is present in high numbers in a specific geographical location is referred to as a(an) a. Endemic. b. Epidemic. c. Pandemic. d. Mutation. e. None of the above.a. Endemic.Which organism requires fimbriae to stick to the lining of the genitourinary tract? a. S. pneumoniae b. HIV (AIDS Virus) c. The bacterium that causes cholera d. E. coli e. None of the above.d. E. coliWhat has been shown to remain active and infectious for hours on a toilet seat? a. HIV (AIDS Virus) b. Creutzfeldt-Jakob Disease prion c. Herpes Virus d. All of the above. e. None of the above.c. Herpes VirusWhich of the following diseases requires a tick vector for transmission? a. Rocky Mountain Spotted Fever b. Tularemia c. Inhalation Anthrax d. Herpes Virus e. None of the above.a. Rocky Mountain Spotted Fever