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 : 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 : 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 : A bacterial species generation time would be determined during the phase. a. decline b. lag c. log d. stationary
Last Answer : c. log
Description : Growth curve does not include following phases of bacteria – a. Decline phase b. Stationary phase c. Lag phase d. Synchronous growth
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 : 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 : The reproduction rate is equal to death rate in which stage a. Decline phase b. Stationary phase c. Lag phase d. Log phase
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
Last Answer : Ans: A
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 : Mycotoxins are formed during the end of a. Lag phase b. Log phase c. Death phase d. Stationary phase
Description : Exponential phase of growth curve of bacteria is of limited duration because of A.rise in cell density B.accumulation of toxic metabolites C.exhaustion of nutrients D.all of these
Last Answer : D.all of these
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 : 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 : 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 : What does the stationary phase of sigmoid growth curve indicate? -Biology
Last Answer : answer:
Description : Log-phase is also known as a. Death phase b. Exponential phase c. Lag-phase d. None
Description : “Antagonism “ is seen in a. Lag phase b. Plasmids c. Log phase d. None of these
Description : Aminoglycoside antibiotics exert the following action(s) on sensitive bacteria: A. Induce synthesis of defective proteins B. Make bacterial cell membrane more leaky C. Augment their own carrier mediated entry into the bacteria D. All of the above
Last Answer : D. All of the above
Description : Do all bacteria require oxygen for growth?
Last Answer : Many bacteria are aerobic; that is, they require oxygen to grow and perform the biochemical reactions of their metabolism. There are, however, a large number of bacterial species that are ... obligate anaerobes, while others are facultative anaerobes, meaning that they live with or without oxygen.
Description : Which of the following (s) is/are the major spoilage of soft drinks from the marked growth of yeasts and bacteria? A.Cloudiness and ropiness B.Flat sour spoilage C.Superficial fungal spoilage D.Pin-spot molding
Last Answer : A.Cloudiness and ropiness
Last Answer : Cloudiness and ropiness
Description : For most bacteria, the optimum pH for growth lies between A- .6.5-7.5 B- B.3.5-4.5 C-.4.5-5.5 D-.5.5-6.5
Last Answer : 6.5-7.5
Description : Selective media facilitate growth of only one kind of organism.Saboraud medium is used to selectively isolate A- coliform bacteria B- gram positive bacteria C- .yeasts D- acid fast organisms
Last Answer : .yeasts
Description : When a substance is added to a liquid medium which inhibits the growth of unwanted bacteriaand favors the growth of wanted bacteria, it is known as A- differential medium B- enriched medium C- enrichment medium D-selective medium
Last Answer : enrichment medium
Description : Agar is used for solidifying culture media because A-it does not affect by the growth of bacteria B-it does not add to the nutritive properties of the medium C-the melting and solidifying points of agar solution are not the same D-all of the above
Last Answer : all of the above
Description : Which is the effect of antigen in an ill person? (1) It increases the production of W.B.C. (2) It increases the production of antibiotics (3) It increases the production of antiserum against bacteria (4) It prevents the growth of bacteria
Last Answer : (2) It increases the production of antibiotics Explanation: Vaccines containing antigens are introduced into the body, stimulating the immune system response by instructing B cells, with assistance from T cells, to ... , and send it to the T cells so that an immune system response can be mobilized.
Description : Which is the effect of antigen in an ill person ? (1) It increases the production of W.B.C. (2) It increases the production of antibiotics (3) It increases the production of anti-serum against bacteria (4) It prevents the growth of bacteria
Last Answer : It increases the production of antibiotics
Description : n which stage or phase of Product Life Cycle, Sales Volume is at Peak Point a) Growth b) Saturation c) Maturity d) Decline
Last Answer : b) Saturation
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 : Which of the following antibiotics work by targetting protein synthesis? a. Methicillin b. Chloramphenicol c. Penicillin d. Nystatin.
Last Answer : b. Chloramphenicol
Description : Antibiotics and chemotherapeutic agents have been available to doctors since a. The Civil War. b. The days of the Roman physicians. c. 1965 d. The 1940s.
Last Answer : d. The 1940s.
Description : New approaches to antibiotic therapy include a. Carbohydrate targets in the wall LPS. b. unregulating DNA replication. c. Discovering new and unique antibiotics. d. All of the above (A—C) are correct.
Last Answer : d. All of the above (A—C) are correct.
Description : A superinfection could arise from a. Using antibiotics when not needed. b. Using unnecessarily large doses of antibiotics. c. Stopping antibiotic treatment prematurely.. d. All of the above (A—C) are correct.
Last Answer : b. Using unnecessarily large doses of antibiotics.
Description : Antibiotics inhibiting nucleic acid synthesis include a. Rifampin and quinolones. b. Aminoglycosides and tetracyclines. c. Lincosamides and streptogramins. d. Macrolides and ami noglycosides.
Last Answer : a. Rifampin and quinolones.
Description : Two cyclic polypeptide antibiotics are a. Vancomycin and streptomycin. b. Penicillin and cephalosporin. c. Bacitracin and polymyxins d. .gentamicin and chloramphenicol
Last Answer : c. Bacitracin and polymyxins
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 : Organisms that normally inhabit the body a. include Treponema pallidum. b. cause endogenous diseases. c. may be detected by Donovan bodies. d. resist the effects of antibiotics.
Last Answer : b. cause endogenous diseases.
Description : What is the best treatment for cholera? a. Antibiotics b. Water c. Milk d. Oral Rehydration Therapy
Last Answer : d. Oral Rehydration Therapy
Description : Cases of Rheumatic heart disease have decreased in recent years because of _________. a. Use of Antibiotics for Strep. Throat b. A New Vaccine for Strep. Throat. c. The Vaccine for Pertussis. d. Better Hygiene.
Last Answer : a. Use of Antibiotics for Strep. Throat
Description : Excision repair would correct DNA damage caused by a. Antibiotics. b. UV Light. c. A Chemical Mutagen. d. A Dna Replication Error.
Last Answer : b. UV Light.
Description : When is ionizing radiation used to sterilize? a. To Sterilize Vitamins b. For Preserving Foods c. To Sterilize Hormones d. To Sterilize Antibiotics e. All The Above
Last Answer : e. All The Above
Description : Phosphate regulation has been observed in the production of A.alkaloids B.antibiotics C.gibberelins D.all of these
Description : The plasmid-mediated properties is/are A.fermentation of lactose B.production of enterotoxin C.resistance to antibiotics D.all of these
Description : The plasmid-mediated properties is/are A- fermentation of lactose B- production of enterotoxin C- resistance to antibiotics D- all of these
Last Answer : all of these
Description : In the sigmoid curve (or) growth curve of bacteria how many stages are there a. 3 b. 4 c. 2 d. 5