5000 Plus MCQs for Lab Technician and Technologists are designed to test the knowledge and proficiency of laboratory professionals who work in the field of clinical laboratory science. These questions cover a wide range of topics related to laboratory science, including anatomy, physiology, microbiology, chemistry, and hematology.
3201 to 3250 MCQs for Lab Technician and Technologist Exam Preparation
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Questions 3201 to 3250
An example of competitive inhibition of an enzyme is the inhibition of
- a) Succinic dehydrogenase by malonic acid
- b) Cytochrome oxidase by cyanide
- c) Hexokinase by glucose-6-phosphate
- d) Carbonic anhydrase by carbon dioxide
The following organisms have been proposed as sources of single cell protein
- a) Bacteria
- b) Yeasts
- c) Algae
- d) All the three
Nitrites are oxidized to nitrates by a microorganism
- a) Nitrosomonas
- b) Nitrosococcus
- c) Nitrobacter
- d) Azotobacter
The major constituents in agar are
- a) Fats
- b) Aminoacids
- c) Polysaccharides
- d) Polypeptides
Multiple antibiotic resistance is mediated by
- a) Episome
- b) Plasmid
- c) Colplasmid
- d) Both second and third
“Antagonism” is seen in
- a) Lag phase
- b) Plasmids
- c) Log phase
- d) None of these
The first phase of a growth curve is
- a) Log phase
- b) Lag phase
- c) ? phase
- d) Both a and b
In gram positive and gram negative bacteria the electron transport contains
- a) Naphthoquinone
- b) Plastoquinone
- c) Ubiquinone
- d) Both first and second
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
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
Which one of the following tissues can metabolize glucose, fatty acids and ketone bodies for ATP production?
- a) Liver
- b) Muscle
- c) Brain
- d) R.B.C
Which one of the following mineral elements play an important role in biological nitrogen fixation
- a) Copper
- b) Magnesium
- c) Zinc
- d) Molybdenum
Rapid bacterial growth phase is known as
- a) Log
- b) Lag
- c) Lack
- d) None of these
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
Mycotoxins are formed during the end of
- a) Lag phase
- b) Log phase
- c) Death phase
- d) Stationary phase
Bacteria which need oxygen for growth are called
- a) Thermophilic bacteria
- b) Microaerophilic bacteria
- c) Facultative anaerobic bacteria
- d) Mycobacteria
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
Drug resistance in bacteria is mainly determined by factor
- a) F
- b) R
- c) Col
- d) Lysogenic factor
The ion that is required in trace amounts for the growth of bacteria is
- a) Calcium
- b) Magnesium
- c) Cobalt
- d) Sodium
The most important vitamin for the growth of bacteria is
- a) B-complex
- b) Vitamin A
- c) Vitamin D
- d) Vitamin C
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
If the source of energy for bacteria is from chemical compounds they are said to be
- a) Phototrophs
- b) Autotrophs
- c) Chemotrophs
- d) Chemolithotroph
In the synthesis of cell components the major element required is
- a) Nitrogen
- b) Sulphur
- c) Carbon
- d) Oxygen
For the formation of cell-components the elements required are
- a) Nitrogen
- b) Oxygen
- c) Sulphur
- d) All of these
For the synthesis of amino acids cysteine, cystine and methionine the element required is
- a) Sulphur
- b) Oxygen
- c) Nitrogen
- d) None of these
Sulphur can be utilized by bacteria in the form of
- a) Organic compounds
- b) Inorganic compounds
- c) Elemental compounds
- d) All of the above
Phosphorous is an essential component of
- a) Nucleotides
- b) Nucleic acids
- c) Phospholipids and Heichoic acids
- d) All the above
Trace elements are
- a) Zn+2, Cu+2, Mn+2
- b) MO6+, Ni2+, B3+ and CO2+
- c) Both first and second
- d) None of these
Most bacteria do not require the ion
- a) Mg2+
- b) Ca2+
- c) Na+
- d) Fe2+
Vitamin function as
- a) Co-enzymes
- b) Co-molecules
- c) Building blocks of cell
- d) None of these
The vitamin required for Lactobacillus species is
- a) Riboflavin
- b) Niacin
- c) Pyridoxine
- d) Folic acid
Vitamin K is necessary for the species
- a) Lactobacillus spp.
- b) Bacillus anthracis
- c) Bacteroides melaninogenicus
- d) All of these
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
Radical shifts can be prevented by adding
- a) Acids
- b) Alkali
- c) Buffer
- d) None of these
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
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
How much time a bacterium take for the complete duplication?
- a) 30 min.
- b) 10 min.
- c) 20 min.
- d) 25 min.
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
In bacteria, the increase in population is in the manner
- a) Geometric progression
- b) Multiplication
- c) Doubling
- d) None of these
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
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
Log-phase is also known as
- a) Death phase
- b) Exponential phase
- c) Lag-phase
- d) None
The no. of generations per hour in a bacteria is
- a) Growth rate
- b) Generation time
- c) Sigmoid curve
- d) None of these
In the sigmoid curve (or) growth curve of bacteria how many stages are there
- a) 3
- b) 4
- c) 2
- d) 5
The reproduction rate is equal to death rate in which stage
- a) Decline phase
- b) Stationary phase
- c) Lag phase
- d) Log phase
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
Optimum growth temperature is greater than 45°C
- a) Mesophiles
- b) Thermophiles
- c) Psychrophiles
- d) None of these
The organisms which can grow both in presence and absence of oxygen
- a) Aerobes
- b) Anaerobes
- c) Facultative anaerobes
- d) Strict aerobes
The organisms which can grow best in the presence of a low concentration of oxygen
- a) Aerophilic
- b) Microaerophilic
- c) Aerobic
- d) Anaerobic
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
Answer Key Summary
The questions are typically designed to assess the technical skills and knowledge required for the laboratory profession, including the ability to analyze laboratory test results, perform laboratory procedures, and maintain laboratory equipment.
To prepare for these MCQs, candidates should have a thorough understanding of the key concepts and principles of laboratory science. They should also be familiar with common laboratory equipment and procedures, as well as laboratory safety protocols.
Candidates may also benefit from studying specific laboratory science textbooks or taking online courses that cover the material tested in the MCQs. Additionally, practicing sample MCQs and reviewing the answers can help candidates identify areas where they may need to improve their knowledge or skills.
Overall, the MCQs for lab technologists are designed to be challenging and comprehensive, requiring candidates to demonstrate a high level of proficiency in the field of laboratory science.
