Description : Optimum growth temperature is greater that 45oC is a. Mesophiles b. Thermophiles c. Psychrophiles d. None of these
Last Answer : Ans: A
Description : Bacteria which need oxygen for growth are called a. Thermophilic bacteria b. Microaerophilic bacteria c. Facultative anaerobic bacteria d. Mycobacteria
Last Answer : Ans: B
Description : Which of the following are optimum temperature conditions for making benzenediazonium chloride from aniline? (a) 0°C to 10°C (b) 20°C to 25°C (c) 30°C to 40°C (d) 45°C to 50°C
Last Answer : 0°C to 10°C
Description : A microbe that is a microaerophilic mesophile would grow optimally at and a. high 02; 30°C b. low 02; 20°C c. no 02; 30°C d. low 02; 37°C
Last Answer : d. low 02; 37°C
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 : Growth curve does not include following phases of bacteria – a. Decline phase b. Stationary phase c. Lag phase d. Synchronous growth
Description : Cyclic phosphorylation is generally present in a. Cyanobacteria b. Algae c. Bacteria d. Plants
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 : 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 : 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 : 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 : 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 : 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 : Drug resistance in bacteria is mainly determined by factor: a. F b. R c. Col d. Lysogenic factor
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 : In gram positive and gram negative bacteria the electron transport contains a. Naphthquinone b. Plastoquinone c. Ubiquinone d. Both a and b
Description : Tubercular bacilli grow best in a. Absence of O2 b. Presence of CO2 c. Presence of O2 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
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 : Non-cyclic photophosphorylation is also known as a. Oxygenic photosynthesis b. Photosynthesis c. Anoxygenic photosynthesis d. Photophosphorylation
Description : Log-phase is also known as a. Death phase b. Exponential phase c. Lag-phase d. None
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 : Rapid bacterial growth phase is known as a. Log b. Lag c. Lack d. None of these
Description : Fats are solids at (A) 10°C (B) 20°C (C) 30°C (D) 40°C
Last Answer : Answer : B
Description : A mixture of 10% C6H6 vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C. (A) 21.7 (B) 20 (C) 27.3 (D) 18.7
Last Answer : (D) 18.7
Description : Optimum temperature for cool season vegetables is: a. 25-30°C b. 25-27°C c. 18-24°C d. 15-20°C
Last Answer : 18-24°C
Description : The optimum cardinal temparature point for germination of rice seeds is– 1) 20°C – 25°C 2) 18°C – 22°C 3) 30°C – 32°C 4) 37°C – 39°C
Last Answer : 1) 20°C – 25°C
Description : 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of A. 0°C B. 15°C C. 20°C D. 25°C
Last Answer : ANS: C
Description : Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are (A) 5°C and 1 kgf/cm2 (B) - 20°C and 1 kgf/cm2 (C) 0°C and 1 kgf/cm2 (D) 0°C and 3 kgf/cm
Last Answer : (A) 5°C and 1 kgf/cm
Description : Date growth does not cease if temperature does not fall below: a. 0°C. b. 10°C c. 18°C d. 20°C
Last Answer : 18°C
Description : Normal temperature and pressure (N.T.P.) corresponds to (A) 0°C and 760 mm Hg (B) 15°C and 760 mm Hg (C) 20°C and 760 mm Hg (D) 0°C and 1 kgf/cm2
Last Answer : (C) 20°C and 760 mm Hg
Description : If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be (a) 80°C (b) 0°C (c) 40°C (d) 20°C (e) 60°C.
Last Answer : Answer : b
Description : The Manufacturer of aeration devices reports the oxygen transfer rate of the device obtained through laboratory tests carried under standard conditions. Such standard condition are : (a) Wastewater at zero DO, 25°C and 760 mm ... DO, 20°C and 760 mm Hg (d) Wastewater at zero DO, 0°C and 700 mm Hg
Last Answer : (c) Tapwater at zero DO, 20°C and 760 mm Hg
Description : What happens when the temperature of water falls from 30°C and 0°C? (a) The volume of ice formed will be less than volume of water (b) The volume of ice formed will be more than the volume of water (c) Water will not freeze at 0°C (d) None of the above
Last Answer : Ans:(b)
Description : The suitable temperature to transport viral culture is – a. 30oC b. 5oC c. 25oC d. 45oC e. None of these
Description : Mycotoxins are formed during the end of a. Lag phase b. Log phase c. Death phase d. Stationary phase
Description : Which of the following organisms requires tryptophan for growth? a. H.influenza b. Vibrio c. Gonococci d. S.typhi
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 : 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 reproduction rate is equal to death rate in which stage a. Decline phase b. Stationary phase c. Lag phase d. Log phase