Description : What is the period where there is the least amount of growth in the growth curve? a. Lag phase b. Log phase c. Stationary phase d. Decline phase
Last Answer : a. Lag phase
Description : Bacteria are most sensitive to antibiotics at which phase of growth curve A Lag phase B Log Phase C Stationary phase D Phase of Decline
Last Answer : B Log Phase
Description : Bacteria are more sensitive to antibiotics at which phase of growth curve? a. Decline phase b. Stationary phase c. Lag phase d. Log phase
Last Answer : Ans: D
Description : The reproduction rate is equal to death rate in which stage a. Decline phase b. Stationary phase c. Lag phase d. Log phase
Description : The most active stage in the sigmoid curve of bacteria in which maximum growth is attained a. Lag phase b. Stationary phase c. Decline phase d. Log phase
Description : Starvation proteins are produced by a culture during which of the following segments of the growth curve? A - Lag phase B- Exponential phase C- Stationary phase D- Death phase
Last Answer : Stationary phase
Description : Mycotoxins are formed during the end of a. Lag phase b. Log phase c. Death phase d. Stationary phase
Last Answer : Ans: A
Description : Growth curve does not include following phases of bacteria – a. Decline phase b. Stationary phase c. Lag phase d. Synchronous growth
Description : Physiologically the cells are active and are synthesizing new protoplasm in which stage of the growth in bacteria a. Log phase b. Lag phase c. Stationary phase d. None of these
Last Answer : Ans: C
Description : Cells are active and synthesizing new protoplasm. This stage of growth is called a. Lag phase b. Stationary phase c. Log phase d. All of these
Description : During the stationary phase of bacterial growth, the population of living cells is _____ the population of dying cells. a. greater than b. smaller than c. equal to d. increasing faster than
Last Answer : c. equal to
Description : Rapid bacterial growth phase is known as a. Log b. Lag c. Lack d. None of these
Description : The process of growth is maximum during (a) log phase (b) lag phase (c) senescence (d) dormancy.
Last Answer : (a) log phase
Description : The maximum growth rate occurs in (a) stationary phase (b) senescent phase (c) lag phase (d) exponential phase
Last Answer : (d) exponential phase.
Description : Log-phase is also known as a. Death phase b. Exponential phase c. Lag-phase d. None
Description : the first phase of a growth curve is a. Log phase b. Lag phase c. ? phase d. Both a and b
Last Answer : Ans: B
Description : “Antagonism “ is seen in a. Lag phase b. Plasmids c. Log phase d. None of these
Description : Bacterial leaf blight of rice is caused by a species (a) Alternaria (b) Erwinia (c) Xanthomonas (d) Pseudomonas.
Last Answer : (c) Xanthomonas
Description : Bacterial species in fish are naturally adapted to the cold environment in which most fish live and thus, _____ will not affect them; _____ is preferred. a. heating, cooking b. cooling, refrigeration c. warming, boiling d. cooling, freezing
Last Answer : d. cooling, freezing
Description : In the soil, antibiotics are produced by some a. Fungal species and viruses. b. Bacterial species and viruses. c. Viruses and helminthic species. d. Fungal and bacterial species.
Last Answer : d. Fungal and bacterial species.
Description : The most common cause of an invasive wound infection, such as a burn, is a. gram-positive bacterial species. b. treponema pallidum. c. Pseudomonas aeruginosa. d. Escherichia coli.
Last Answer : c. Pseudomonas aeruginosa.
Description : What bacterial species is most often associated with cystitis? a. Treponemo pallidum b. Escherichia coIi c. Chlamydia trachomatis d. Pseudomonas aeruginosa
Last Answer : b. Escherichia coIi
Description : Which of the following is NOT a condition seen with the development of dental caries? a. A Susceptible Tooth With A Buildup Of Plaque b. Dietary Carbohydrates (Usually Sugar) c. Acidogenic Bacterial Species d. Chewing A Lot Of Gum
Last Answer : d. Chewing A Lot Of Gum
Description : The majority of bacterial species that cause foodborne and waterborne illnesses in humans are _____. a. Gram-Negative Rods b. Gram-Negative Cocci c. Gram-Positive Rods d. Rods Without A Wall
Last Answer : a. Gram-Negative Rods
Description : What is the name of the syndrome of fever, abdominal cramps, and bloody mucoid stools caused by Shigella species? a. Bacterial dysentery b. Typhoid fever c. Pseudomembranous colitis d. HUS
Last Answer : a. Bacterial dysentery
Description : Which one of the following bacterial species is NOT a cause of food poisoning (noninflammatory gastroenteritis)? a. Escherichia coli b. Bacillus cereus c. Staphylococcus aureus d. Clostridium perfringens
Last Answer : a. Escherichia coli
Description : Which one of the following statements does NOT apply to dental plaque? a. It is an example of a biofilm. b. It is most noticeable on the molars. c. Its buildup on teeth can lead to gingivitis and periodontal disease. d. It is dominated by aerobic bacterial species.
Last Answer : d. It is dominated by aerobic bacterial species.
Description : The Ames test is an effective procedure for a. Identifying disease-causing bacterial species. b. Detecting potential human carcinogens. c. Determining if DNA replication has occurred. d. Detecting antibiotic resistance.
Last Answer : b. Detecting potential human carcinogens.
Description : The Ames test is used to a. Identify Potential Human Carcinogens. b. Discover Auxotrophic Mutants. c. Find Pathogenic Bacterial Species. d. Identify Antibiotic Resistant Mutants.
Last Answer : a. Identify Potential Human Carcinogens.
Description : Various bacterial species can be subdivided into A- Subspecies B- biovarieties C- Serovarieties D- all of these
Last Answer : all of these
Description : When nutrients are limiting, some bacterial species can form resistant structures called _____. a. endospores b. cysts c. seeds d. capsules
Last Answer : a. endospores
Description : Intracellular organization in bacterial and archaeal species is centered a. Compartmentation of metabolism. b. Growth and reproduction. c. Sensing and responding to environment. d. All the above (A—C) are correct.
Last Answer : d. All the above (A—C) are correct.
Description : If you wanted to study the surface of a bacterial cell, you would use a. A transmission electron microscope. b. A light microscope with phase-contrast optics. c. A scanning electron microscope. d. A light microscope with dark-field optics.
Last Answer : c. A scanning electron microscope.
Description : If you wanted to study bacterial motility you would most likely use a. A transmission electron microscope. b. A tight microscope with dark-field optics. c. A scanning electron microscope. d. A light microscope with phase-contrast optics.
Last Answer : a. A transmission electron microscope.
Description : During the process of lysogeny _____. a. Phage DNA Integrates Into The Bacterial Chromosome. b. A Bacterium Acquires DNA From The External Environment. c. Competent Cells Receive Plasmids. d. New Phage Particles Are Assembled In The Host Bacterium.
Last Answer : a. Phage DNA Integrates Into The Bacterial Chromosome.
Description : During exponential growth, the growth rate isA-.number of generations per unit time B- reciprocal of generation time C- both (a) and D- none of these
Last Answer : reciprocal of generation tim
Description : Bacillus subtilis makes a good "bacterial factory" in genetic engineering because _____. a. it normally retains the products it makes b. it is not a human pathogen c. contains endotoxins in it's cell wall d. traditionally ferments sugars
Last Answer : b. it is not a human pathogen
Description : Antibiotics will not work against _____ diseases because they lack the structures and metabolic machinery with which antibiotics interfere. a. viral b. bacterial c. fungal d. protozoan
Last Answer : a. viral
Description : The imidazole drugs are of value for treating a. Viral diseases. b. Protozoal diseases and bacterial diseases. c. Bacterial diseases. d. Fungal diseases.
Last Answer : d. Fungal diseases
Description : Gentamicin and other aminoglycoside drugs are widely prescribed for treatment of _____ infections. a. fungal b. gram-positive bacterial c. gram-negative bacterial d. staphylococcal
Last Answer : c. gram-negative bacterial
Description : The sulfonamides interfere with bacterial metabolism by a. blocking cell wall synthesis. b. disrupting folic acid metabolism. c. reacting with bacterial cell membranes. d. inhibiting DNA replication.
Last Answer : b. disrupting folic acid metabolism.
Description : Vancomycin inhibits _____________ synthesis. a. protein b. DNA c. bacterial cell wall d. RNA
Last Answer : c. bacterial cell wall
Description : Which one of the following is not an antigen? a. A toxin b. A virus c. A bacterial cell d. All (A-C) are antigens
Last Answer : d. All (A-C) are antigens
Description : ALL the following are immunogenic except: a. Bacterial Flagella. b. Haptens. c. Bacterial Pili. d. Viral Spikes.
Last Answer : d. Viral Spikes.
Description : Pyrogens are a. Proteins Affecting the Hypothalamus. b. Bacterial Fragments. c. Fever-Producing Substances. d. All the Above (A—C) Are Correct.
Last Answer : d. All the Above (A—C) Are Correct.