Recent questions tagged bacterial-growth

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

Last Answer : Ans: D

Description : The suitable temperature to transport viral culture is – a. 30oC b. 5oC c. 25oC d. 45oC e. None of these

Last Answer : Ans: B

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 : Tubercular bacilli grow best in a. Absence of O2 b. Presence of CO2 c. Presence of O2 d. None of these

Last Answer : Ans: B

Description : Which of the following organisms requires tryptophan for growth? a. H.influenza b. Vibrio c. Gonococci d. S.typhi

Last Answer : Ans: D

Description : The process of formation of mesozygote is called a. Meromixis b. Exozygote c. Mitosis d. Meiosis

Last Answer : Ans: A

Description : Artificial transformation in laboratory is carried out by treating the cells with a. MgCl2 b. Cacl2 c. NaCl d. HCl

Last Answer : Ans: B

Description : The number of ATP molecules formed during cyclic phosphorylation are a. One b. Two c. Four d. Six

Last Answer : Ans: D

Description : Non-cyclic photophosphorylation is also known as a. Oxygenic photosynthesis b. Photosynthesis c. Anoxygenic photosynthesis d. Photophosphorylation

Last Answer : Ans: B

Description : Cyclic phosphorylation is generally present in a. Cyanobacteria b. Algae c. Bacteria d. Plants

Last Answer : Ans: A

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

Last Answer : Ans: A

Description : The utilization of light energy to drive the synthesis of ATP is called as a. Photolysis b. Photophosphorylation c. Photosynthesis d. Respiration

Last Answer : Ans: C

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

Last Answer : Ans: B

Description : The organisms which can grow best in the presence of a low concentration of oxygen a. Aerophilic b. Microaerophilic c. Aerobic d. Anaerobic

Last Answer : Ans: B

Description : The organisms which can grow both in presence and absence of oxygen a. Aerobes b. Anaerobes c. Faculative anaerobes d. Strict aerobes

Last Answer : Ans: A

Description : Optimum growth temperature is greater that 45oC is a. Mesophiles b. Thermophiles c. Psychrophiles d. None of these

Last Answer : Ans: A

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

Last Answer : Ans: B

Description : The reproduction rate is equal to death rate in which stage a. Decline phase b. Stationary phase c. Lag phase d. Log phase

Last Answer : Ans: D

Description : In the sigmoid curve (or) growth curve of bacteria how many stages are there a. 3 b. 4 c. 2 d. 5

Last Answer : Ans: B

Description : The no. of generations per hour in a bacteria is a. Growth rate b. Generation time c. Sigmoid curve d. None of these

Last Answer : Ans: B

Description : Log-phase is also known as a. Death phase b. Exponential phase c. Lag-phase d. None

Last Answer : Ans: C

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 : 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

Last Answer : Ans: A

Description : The generation time is a. The time required for the cell to divide b. The total division of the cell during its life time c. The total no.of cells formed d. None of these

Last Answer : Ans: C

Description : How much time a bacterium take for the complete duplication? a. 30 min. b. 10 min. c. 20 min. d. 25 min.

Last Answer : Ans: C

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

Last Answer : Ans: C

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

Last Answer : Ans: B

Description : Radical shifts can be prevented by adding a. Acids b. Alkali c. Buffer d. None of these

Last Answer : Ans: C

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

Last Answer : Ans: C

Description : Vitamin K is necessary for the species a. Lactobacillus spp. b. Bacillus anthracis c. Bacteroides melaninogenicus d. All of these

Last Answer : Ans: A

Description : The vitamin required for Lactobacillus species is a. Riboflavin b. Niacin c. Pyridoxine d. Folic acid

Last Answer : Ans: B

Description : Vitamin function as a. Co-enzymes b. Co-melecules c. Building blocks of cell d. None of these

Last Answer : Ans: C

Description : Most bacteria do not require the ion a. Mg2+ b. Ca2+ c. Na+ d. Fe+2

Last Answer : Ans: C

Description : Trace elements are a. Zn+2, Cu+2, Mn+2 b. MO6+, Ni2+, B3+ and CO2+ c. Both a and b d. None of these

Last Answer : Ans: D

Description : Phosphorous is an essential component of a. Nucleotides b. Nucleic acids c. Phospholipids and Heichoic acids d. All the above

Last Answer : Ans: D

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

Last Answer : Ans: A

Description : For the synthesis of amino acids cysteine, cystine and methionine the element required is a. Sulphur b. Oxygen c. Nitrogen d. None of these

Last Answer : Ans: D

Description : For the formation of cell-components the elements required are a. Nitrogen b. Oxygen c. Sulphur d. All of these

Last Answer : Ans: D

Description : In the synthesis of cell components the major element required is a. Nitrogen b. Sulphur c. Carbon d. Oxygen

Last Answer : Ans: C

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

Last Answer : Ans: C

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

Last Answer : Ans: B

Description : The most important vitamin for the growth of bacteria is a. B-complex b. Vitamin A c. Vitamin D d. Vitamin C

Last Answer : Ans: A

Description : The ion that is required in trace amounts for the growth of bacteria is a. Calcium b. Magnesium c. Cobalt d. Sodium

Last Answer : Ans: C

Description : Drug resistance in bacteria is mainly determined by factor: a. F b. R c. Col d. Lysogenic factor

Last Answer : Ans: D

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

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 : Mycotoxins are formed during the end of a. Lag phase b. Log phase c. Death phase d. Stationary phase

Last Answer : Ans: A

Description : Clostridium welchii spore formation can be induced only on specified media such as a. Wilson-Blair medium b. Macconkey medium c. Ellner medium d. Thayee-Martion medium

Last Answer : Ans: C