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
Last Answer : Ans: D
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 : 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 : 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 : 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 : Rapid bacterial growth phase is known as a. Log b. Lag c. Lack d. None of these
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 : A bacterial species generation time would be determined during the phase. a. decline b. lag c. log d. stationary
Last Answer : c. log
Description : In the sigmoid curve (or) growth curve of bacteria how many stages are there a. 3 b. 4 c. 2 d. 5
Description : The no. of generations per hour in a bacteria is a. Growth rate b. Generation time c. Sigmoid curve d. None of these
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 : The most important vitamin for the growth of bacteria is a. B-complex b. Vitamin A c. Vitamin D d. Vitamin C
Description : The ion that is required in trace amounts for the growth of bacteria is a. Calcium b. Magnesium c. Cobalt d. Sodium
Description : pH required for the growth of bacteria is a. 6.8 – 7.2 b. 5.6 – 8.2 c. 3.0 – 6.0 d. 8.0 – 14.0
Description : Bacteria which need oxygen for growth are called a. Thermophilic bacteria b. Microaerophilic bacteria c. Facultative anaerobic bacteria d. Mycobacteria
Description : Cyclic phosphorylation is generally present in a. Cyanobacteria b. Algae c. Bacteria d. Plants
Description : In bacteria, the increase in population is in the manner a. Geometric progression b. Multiplication c. Doubling d. None of these
Description : The most common mode of cell division in bacteria is a. Binary fission b. Transverse binary fission c. Longitudinal binary fission d. None of these
Description : The bacteria which are able to grow at 0°C but which grow at 20°C to 30°C, are known as a. Psychrophiles b. Facultative psychrophiles c. Average psychrophiles d. Mesophiles
Description : Most bacteria do not require the ion a. Mg2+ b. Ca2+ c. Na+ d. Fe+2
Description : Sulphur can be utilized by bacteria in the form of a. Organic compounds b. Inorganic compounds c. Elemental compounds d. All of the above
Description : If the source of energy for bacteria is from chemical compounds they are said to be a. Phototrophs b. Autotrophs c. Chemotrophs d. Chemolithotroph
Description : Drug resistance in bacteria is mainly determined by factor: a. F b. R c. Col d. Lysogenic factor
Description : In gram positive and gram negative bacteria the electron transport contains a. Naphthquinone b. Plastoquinone c. Ubiquinone d. Both a and b
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 : Which of the following organisms requires tryptophan for growth? a. H.influenza b. Vibrio c. Gonococci d. S.typhi
Description : Optimum growth temperature is greater that 45oC is a. Mesophiles b. Thermophiles c. Psychrophiles d. None of these
Description : Minimum growth temperature is a. The growth of organisms at lowest temperature b. The lowest temperature at which the microorganisms grow c. The maximum temperature at which the growth is stable d. None of these
Description : The orderly increase in the quantity of all the cellular components is known as a. Reproduction b. Growth c. Binary fission d. None of these
Description : The principle in microbiological assays is a. At certain range the concentration of growth factor will bear a linear relationship to the amount of nutrients added b. Concentration of growth factor have a linear relationship with the growth of the organism c. Both a and b d. None of the above
Description : Growth in a closed system, affected by nutrient limitation and waste product accumulation is called a. Batch culturing b. Ascus c. Fruiting body d. Sporangiosphore
Description : The process of growth is maximum during (a) log phase (b) lag phase (c) senescence (d) dormancy.
Last Answer : (a) log phase
Description : What does the stationary phase of sigmoid growth curve indicate? -Biology
Last Answer : answer:
Description : The suitable temperature to transport viral culture is – a. 30oC b. 5oC c. 25oC d. 45oC e. None of these
Description : Tubercular bacilli grow best in a. Absence of O2 b. Presence of CO2 c. Presence of O2 d. None of these
Description : The process of formation of mesozygote is called a. Meromixis b. Exozygote c. Mitosis d. Meiosis
Description : Artificial transformation in laboratory is carried out by treating the cells with a. MgCl2 b. Cacl2 c. NaCl d. HCl
Description : The number of ATP molecules formed during cyclic phosphorylation are a. One b. Two c. Four d. Six
Description : Non-cyclic photophosphorylation is also known as a. Oxygenic photosynthesis b. Photosynthesis c. Anoxygenic photosynthesis d. Photophosphorylation
Description : During cyclic phosphorylation NADP is formed or not. a. No NADP formation b. No NADP utilization c. NADP is converted into NADPH d. All are correct
Description : The utilization of light energy to drive the synthesis of ATP is called as a. Photolysis b. Photophosphorylation c. Photosynthesis d. Respiration
Description : The compound that is added to the medium to absorb oxygen for the creation of anaerobic conditions a. Sodium Thioglycollate b. Nitrous acid c. Citrate d. None of these
Description : The organisms which can grow best in the presence of a low concentration of oxygen a. Aerophilic b. Microaerophilic c. Aerobic d. Anaerobic
Description : The organisms which can grow both in presence and absence of oxygen a. Aerobes b. Anaerobes c. Faculative anaerobes d. Strict aerobes