6701 to 6750 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 6701 to 6750
- The rate of citric acid cycle is controlled by the allosteric enzyme:
- Aconitase
- Fumarase
- Fumarase ✔
- Malate dehydrogenase
- In the erythrocytes, the net production of ATP molecules by the Rapport-Leubering pathway is
- 0 ✔
- 2
- 4
- 8
- The ratio that most closely approximates the number of net molecules of ATP formed per mole of glucose utilized under aerobic conditions to the net number formed under anaerobic conditions is
- 4:1
- 13:1
- 18:1 ✔
- 24:1
- The pathway of glycogen biosynthesis involves a special nucleotide of glucose. In the reaction below, NuDP stands for NuDP Glucose + glycogenn → NuDP + glycogenn+1
- ADP
- GDP
- UDP ✔
- CDP
- Glucose 6-phosphate is converted to glucose 1-phosphate in a reaction catalysed by the enzyme phosphoglucomutase, which is
- Phosphorylated
- Dephosphorylated
- Phosphorylated-dephosphorylated✔
- Phosphorylated-dephosphorylatedrephosphorylated
- The glycogen content of the liver is upto
- 6%
- 8%
- 10%✔
- 12%
- In glycogenesis a branch point in the molecule is established by the enzyme
- Amylo[1→ 4][1→ 6] transglucosidase ✔
- α [1→ 4] α [1→ 4] Glucan transferase
- Amylo [1→ 6] glucosidase
- Glycogen synthase
- In glycogenolysis, the enzyme which transfers a trisaccharide unit from one branch to the other exposing 1→ 6 branch point is
- Phosphorylase
- α-[1→ 4]→ α-[1→ 4]→ Glucan transferase ✔
- Amylo [1→ 6] glucosidase
- Amylo[1→ 4]→ [1→ 6] transglucosidase
- In the synthesis of glycogen from glucose the reversible step is
- Glucose → glucose 6-phosphate
- Glucose 6-phosphate → glucose 1-phosphate ✔
- Glucose 1-phosphate → UDP glucose
- UDP glucose → glycogen
- The enzyme glucose-6-phosphatase which catalyses the conversion of glucose 6-phosphate to glucose is not found in
- Liver
- Muscle ✔
- Intestine
- Kidney
- Allosteric activator of glycogen synthase is
- Glucose
- Glucose-6-Phosphate ✔
- UTP
- Glucose-1-phosphate
- Action of glycogen synthase is inhibited by
- Insulin
- Glucose
- Mg2+
- Cyclic AMP ✔
- The hormone activating the glycogen synthase activity is
- Insulin✔
- Glucagon
- Epinephrine
- ACTH
- Characteristic features of active site are
- Flexible in nature
- Site of binding
- Acidic
- Both (Flexible in nature ) and (Site of binding) ✔
- Von Gierke’s disease is characterized by the deficiency of
- Glucose-6-phosphatase✔
- α -1→ 4 Glucosidase
- 1→ 6 Glucosidase
- Liver phosphorylase
- Cori disease (Limit dextrinosis) is caused due to absence of
- Branching enzyme
- Debranching enzyme ✔
- Glycogen synthase
- Phosphorylase
- Mc Ardle’s syndrome is characterized by the absence of
- Liver phosphorylase
- Muscle phosphorylase ✔
- Branching enzyme
- Debranching enzyme
- Pompe ’s d isease is caused due to deficiency of
- Lysosomal α-1→4 and 1→6-glucosidase ✔
- Glucose-6-phosphatase
- Glycogen synthase
- Phosphofructokinase
- Amylopectinosis is caused due to absence of
- Debranching enzyme
- Branching enzyme ✔
- Acid maltase
- Glucose-6-phosphatase
- Her’s disease is characterized by deficiency of
- Muscle phosphorylase
- Liver phosphorylase✔
- Debranching enzyme
- Glycogen synthase
- Tarui disease is characterized by the deficiency of the enzyme:
- Liver phosphorylase
- Muscle phosphorylase
- Muscle and erythrocyte phosphofructokinase ✔
- Lysosomal acid maltase
- The hexose monophosphate pathway includes the enzyme:
- Maltase dehydrogenase
- Hexokinase
- α-Ketoglutarate dehydrogenase
- Glucose-6-phosphate dehydrogenase ✔
- The enzymes of the pentose phosphate pathway are found in the
- Cytosol ✔
- Mitochondria
- Nucleus
- Endoplasmic reticulum
- The hydrogen acceptor used in pentose phosphate pathway is
- NAD
- NADP ✔
- FAD
- FMN
- In pentose phosphate pathway, D-ribulose5-phosphate is converted to D-ribose-5- phosphate by the enzyme:
- Fumarase
- Ketoisomerase ✔
- G-6-PD
- Epimerase
- The transketolase enzyme in the pentose phosphate pathway requires the B vitamin.
- Pantothenic acid
- Thiamin ✔
- Riboflavin
- Nicotinic acid
- Xylulose-5-phosphate serves as a donar of active glycolaldehyde, the acceptor is
- Erythrose 4-phosphate ✔
- Ribose 5-phosphate
- Glyceraldehyde 3-phosphate
- Sedoheptulose 7-phosphate
- Pentose phosphate pathway is of significance because it generates
- NADPH for reductive synthesis ✔
- Regenerates glucose 6-phosphate
- Generates fructose 6-phosphate
- Forms glyceraldehyde 3-phosphate
- The pentose phosphate pathway protects erythrocytes against hemolysis by assisting the enzyme:
- Superoxide dismutase
- Catalase
- Glutathionic peroxidase✔
- Cytochrome oxidase
- Hemolytic anemia is caused by the deficiency of certain enzymes of the pentose phosphate pathway, the principal enzyme involved is
- Glucose-6-phosphate dehydrogenase✔
- Aldolase
- Fructose 1, 6-bisphosphatase
- Phosphohexose isomerase
- The sites for gluconeogenesis are
- Liver and kidney ✔
- Skin and pancreas
- Lung and brain
- Intestine and lens of eye
- An enzyme involved in gluconeogenesis is
- Pyruvate kinase
- Pyruvate carboxylase ✔
- Hexokinase
- Phosphohexose isomerase
- The enzyme pyruvate carboxylase is present in
- Cytosol
- Mitochondria ✔
- Nucleus
- Golgi bodies
- The enzyme phosphoenolpyruvate carboxykinase catalyses the conversion of oxaloacetate to phosphoenolpyruvate requires
- ATP
- ADP
- AMP
- GTP ✔
- The enzyme glucose 6-phosphatase is present in
- Liver ✔
- Muscle
- Adipose tissue
- Brain
- In gluconeogensis, an allosteric activator required in the synthesis of oxaloacetate from bicarbonate and pyruvate, which is catalysed by the enzyme pyruvate carboxylase is
- Acetyl CoA ✔
- Succinate
- Isocitrate
- Citrate
- The number of ATP molecules required to convert 2 molecules of lactate into glucose in mammalian liver is
- 2
- 4
- 5
- 6 ✔
- For conjugation with many enogenous and exogenous substances before elimination in urine, the uronic acid pathway provides
- Active glucuronate ✔
- Gulonate
- Xylulose
- Xylito
- UDP glucose is converted to UDP glucurronate, a reaction catalysed by UDP glucose dehydrogenase requires
- NAD+ ✔
- FAD
- NADP
- FMN
- Pentosuria is a rare hereditary disease is characterized by increased urinary excretion of
- L-xylulose ✔
- Xylitol
- Xylulose 5-phosphate
- Ribose 5-phosphate
- The enzyme involved in essential pentosuria is
- Reductase ✔
- Hydroxylase
- Isomerase
- Racemase
- Galactose is synthesized from glucose in
- Mammary gland ✔
- Intestine
- Kidney
- Adipose tissue
- Galactose is readily converted to glucose in
- Liver ✔
- Intestine
- Kidney
- Adipose tissue
- Galactose 1-phosphate is converted to uridine diphosphate galactose, the reaction is catalysed by the enzyme:
- Glactokinase
- Galactose 1-phosphate uridyl transferase ✔
- Uridine diphospho galactose 4-epimerase
- UDP glucose pyrophosphorylase
- The best known cause of galactosemia is the deficiency of
- Galactose 1-phosphate and uridyl transferase ✔
- Phosphoglucomutase
- Galactokinase
- Lactose synthase
- Conversion of fructose to sorbitol is catalysed by the enzyme:
- Sorbitol dehydrogenase
- Aldose reductase ✔
- Fructokinase
- Hexokinase
- A specific fructokinase present in liver has a very high affinity for its substrate because
- Km for fructose is very high
- Km for fructose is very low ✔
- Activity is affected by fasting
- Activity is affected by insulin
- Insulin has no effect on the activity of the enzyme:
- Glycogen synthetase
- Fructokinase ✔
- Pyruvate kinase
- Pyruvate dehydrogenase
- The pathogenesis of diabetic cataract involves accumulation of
- Galactose
- Mannitol
- Sorbitol ✔
- Pyruvate
- Hereditary fructose intolerance involves the absence of the enzyme:
- Aldalose B✔
- Fructokinase
- Triokinase
- Phosphotriose isomerase
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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