6351 to 6400 MCQs for Lab Technician and Technologist Exam Preparation
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.
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Questions 6351 to 6400
- Conversion of β-carotene into retinal requires the presence of
- β-Carotene dioxygenase
- Bile salts
- Molecular oxygen
- All of these ✔
- Conversion of retinal into ritonal requires the presence of
- NADH
- NADPH ✔
- FADH2
- Lipoic acid
- Vitamin A absorbed in intestine is released into
- Portal circulation
- Lacteals ✔
- Both (Portal circulation) and (Lacteals)
- None of these
- Vitamin A is stored in the body in
- Liver ✔
- Adipose tissue
- Reticuloendothelial cells
- All of these
- Rhodopsin contains opsin and
- 11-cis-retinal ✔
- 11-trans-retinal
- All-cis-retinal
- All trans-retinal
- When light falls on rod cells
- All-cis-retinal is converted into all-trans-retinal
- 11-cis-retinal is converted into 11-trans-retinal
- 11-trans-retinal is converted into all-transretinal
- 11-cis-retinal is converted into all-trans-retinal✔
- Conversion of all-trans-retinal into alltrans-retinol requires
- NAD
- NADH
- NADP
- NADPH ✔
- Anti-oxidant activity is present in
- β-Carotene ✔
- Retinol
- Retinoic acid
- All of these
- One international Unit of vitamin A is the activity present in
- 0.3 µg of β-Carotene
- 0.3 µg of retinol ✔
- 0.6 µg of retinoic acid
- All of these
- Vitamin B6 includes
- Pyridoxal
- Pyridoxamine
- Pyridoxine
- All of these ✔
- An early effect of vitamin a deficiency is
- Xerophthalmia
- Keratomalacia
- Prolonged dark adaptation time ✔
- Follicular hyperkeratosis
- Nyctalopia is
- Drying of eyes
- Destruction of cornea
- Blindness
- Inability to see in dimlight ✔
- Rod cells possess a trans-membrane protein which is
- Adenylate cyclase
- Transducin
- Rhodopsin ✔
- Transducin as well as Rhodopsin
- Provitamins A include
- Retinal
- Retionic acid
- Carotenes ✔
- All of these
- Retinoic acid can
- Act as a photo receptor
- Support growth and differentiation ✔
- Act as an anti-oxidant
- None of these
- Prosthetic group in cone cell phototreceptors is
- Iodine
- Opsin
- 11-cis-retinal ✔
- all-trans-retinal
- Retinoic acid is involved in the synthesis of
- Rhodopsin
- Iodopsin
- Porphyrinopsin
- Glycoproteins ✔
- Transducin is a
- Signal transducer
- Stimulatory G-protein
- Trimer
- All of these ✔
- Provitamin D3 is
- Cholecalciferol
- Ergosterol
- 7-Dehydrocholesterol ✔
- Ergocaliferol
- Ergosterol is found in
- Animals
- Plants ✔
- Bacteria
- All of these
- A provitamin D synthesized in human beings is
- Ergosterol
- 7-Dehydrocholesterol ✔
- Cholecalciferol
- 25-Hydroxycholecalciferol
- 25-Hydroxylation of vitamin D occurs in
- Skin
- Liver ✔
- Kidneys
- Intestinal mucosa
- Tubular reabsorption of calcium is increased by
- Cholecalciferol
- 25-Hydroxycholecalciferol
- Calcitriol ✔
- All of these
- Parathormone is required for the conversion of
- Cholecalciferol into 1-hydroxycholecalciferol
- Cholecalciferol into 25-hydroxycholecalciferol
- 25-Hydroxycholecalciferol into calcitriol ✔
- Cholesterol into 7-dehydrocholesterol
- Calcitriol inhibits the conversion of
- Cholesterol into 7-dehydrocholesterol
- Cholecalciferol into 1-hydroxycholecalciferol
- Cholecalciferol into 25-hydroxycholecalciferol ✔
- 25-Hydroxycholecalciferol into 1,25- dihydroxycholecalciferol
- Bowlegs and knock-knees can occur in
- Rickets
- Osteomalacia
- Both (Rickets) and (Osteomalacia) ✔
- Hypervitaminosis D
- Calcification of soft tissues can occur in
- Osteomalacia
- Rickets
- Hypervitaminosis D ✔
- None of these
- Levels of serum calcium and inorganic phosphorus are increased in
- Hypervitaminosis D ✔
- Hypoparathyroidism
- Hypovitaminosis D
- None of these
- Requirement of vitamin E increases with the increasing intake of
- Calories
- Proteins
- PUFA ✔
- Cholesterol
- In human beings, vitamin E prevents
- Sterility
- Hepatic necrosis
- Muscular dystrophy
- None of these ✔
- Vitamin E protects
- Polyunsaturated fatty acids against aperoxidation
- Vitamin A and carotenes against oxidation
- Lung tissue against atmospheric pollutants
- All of these ✔
- Intestinal bacteria can synthesise
- Phyllogquinone
- Farnoquinone
- Both (Phyllogquinone ) and (Farnoquinone) ✔
- Menadione
- A water soluble form of vitamin K is
- Phylloquinone
- Farnoquinone
- Menadione ✔
- None of these
- Prothrombin time is prolonged in
- Vitamin K deficiency
- Liver damage
- Both (Vitamin K deficiency) and (Liver damage) ✔
- None of these
- A synthetic form of vitamin K is
- Menadione ✔
- Farnoquinone
- Phylloquinone
- None of these
- Retinal is reduced to retinol by retinene reductase in presence of the coenzyme
- NAD+
- NADP+
- NADH + H+
- NADPH + H+ ✔
- Retinal exists as an ester with higher fatty acids in the
- Liver ✔
- Kidney
- Lung
- All of these
- Retinol is transported to the blood as retinol attached to
- α1-globulin ✔
- α2-globulin
- β-globulin
- γ-globulin
- Carotenes are transported with the
- Minerals
- Proteins
- Lipids
- Lipoproteins ✔
- The drugs that form complexes with pyridoxal are
- Isoniazid
- Penicillamine
- Rifampicin
- Both (Isoniazid ) and (Penicillamine) ✔
- In the blood the vitamin esters are attached to
- α1-lipoproteins
- α2-lipoproteins
- β-lipoproteins ✔
- γ-lipoproteins
- The non-protein part of rhodopsin is
- Retinal ✔
- Retinol
- Carotene
- Repsin
- Lumirhodopsin is stable only at a temperature below
- –35°C
- –40°C ✔
- –45°C
- –50°C
- Continued intake of excessive amounts of vitamin A especially in children produces
- Irritability
- Anorexia
- Headache
- All of these ✔
- Vitamin D2 is also said to be
- Activated ergosterol
- Fergocalciferol
- Viosterol
- All of these ✔
- The activity of tocopherols is destroyed by
- Oxidation ✔
- Reduction
- Conjugation
- All of these
- Some tocopherols are
- Terpenoid in structure ✔
- Dional in structure
- Isoprenoid in structure
- Farnesyl in structure
- The methyl groups in the aromatic nucleus of a tocopherols are
- 2
- 3 ✔
- 4
- 5
- Vitamin E protects the polyunsaturated fatty acids from oxidation by molecular oxygen in the formation of
- Superoxide
- Peroxide ✔
- Trioxide
- All of these
- The tocopherols prevent the oxidation of
- Vitamin A ✔
- Vitamin D
- Vitamin K
- Vitamin C
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.
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