Recent questions tagged biochemistry

Description : We can now test our drinks for the presence of the date rape drug. When might we be able to test our food for E. coli, etc.? See deatil?

Last Answer : …what are your thoughts is more like it.

Description : The average of pH of urine is (A) 5.6 (B) 6.0 (C) 6.4 (D) 7.0

Last Answer : Answer : B

Description : Calcium absorption is inferred by (A) Fatty acids (B) Amino acids (C) Vitamin D (D) Vitamin B12

Last Answer : Answer : A

Description : Cobalt is a constituent of (A) Folic acid (B) Vitamin B12 (C) Niacin (D) Biotin

Last Answer : Answer : B

Description : Calcium is required for the activation of the enzyme: (A) Isocitrate dehydrogenase (B) Fumarase (C) Succinate thiokinase (D) ATPase

Last Answer : Answer : D

Description : Body water is regulated by the hormone: (A) Oxytocin (B) ACTH (C) FSH (D) Epinephrine

Last Answer : Answer : A

Description : Organic substance of large molecular size is (A) Starch (B) Insulin (C) Lipids (D) Proteins

Last Answer : Answer : D

Description : Organic compound of small molecular size is (A) Urea (B) Uric acid (C) Creatinine (D) Phosphates

Last Answer : Answer : A

Description : One joule is the energy required to (A) Raise the temperature of 1 gm of water by 1°C (B) Raise the temperature of 1 kg of water by 1°C (C) Move a mass of 1 gm by 1 cm distance by a force of 1 Newton (D) Move a mass of 1 kg by 1 m distance by a force of 1 Newton

Last Answer : Answer : D

Description : Which of the following features are present in blood chemistry in uncompensated metabolic alkalosis except? (A) Increased pH (B) Increased bicarbonate (C) Normal chloride (D) Normal pCO2

Last Answer : Answer : D

Description : Metabolic alkalosis can occur in (A) Severe diarrhoea (B) Renal failure (C) Recurrent vomiting (D) Excessive use of carbonic anhydrase inhibitors

Last Answer : Answer : C

Description : Blood chemistry shows the following changes in compensated respiratory acidosis: (A) Increased pCO2 (B) Increased bicarbonate (C) Decreased chloride (D) All of these

Last Answer : Answer : D

Description : During compensation of respiratory alkalosis, all the following changes occur except (A) Decreased secretion of hydrogen ions by renal tubules (B) Increased excretion of sodium in urine (C) Increased excretion of bicarbonate in urine (D) Increased excretion of ammonia in urine

Last Answer : Answer : D

Description : All the following changes in blood chemistry can occur in severe diarrhoea except (A) Decreased pH (B) Decreased bicarbonate (C) Increased pCO2 (D) Increased chloride WATER AND ELECTROLYTE BALANCE 287

Last Answer : Answer : C

Description : All the following statements about renal tubular acidosis are correct except (A) Renal tubules may be unable to reabsorb bicarbonate (B) Renal tubules may be unable to secrete hydrogen ions (C) Plasma chloride is elevated (D) Anion gap is decreased

Last Answer : Answer : D

Description : All the following features are found in blood chemistry in uncompensated lactic acidosis except (A) pH is decreased (B) Bicarbonate is decreased (C) pCO2 is normal (D) Anion gap is normal

Last Answer : Answer : D

Description : Anion gap of plasma can be due to the presence of all the following except (A) Bicarbonate (B) Lactate (C) Pyruvate (D) Citrate

Last Answer : Answer : A

Description : Salicylate poisoning can cause (A) Respiratory acidosis (B) Metabolic acidosis with normal anion gap (C) Metabolic acidosis with increased anion gap (D) Metabolic alkalosis

Last Answer : Answer : C

Description : Anion gap in plasma is because (A) Of differential distribution of ions across cell membranes (B) Cations outnumber anions in plasma (C) Anions outnumber cations in plasma (D) Of unmeasured anions in plasma

Last Answer : Answer : B

Description : Anion gap is increased in (A) Renal tubular acidosis (B) Metabolic acidosis resulting from diarrhoea (C) Metabolic acidosis resulting from intestinal obstruction (D) Diabetic ketoacidosis

Last Answer : Answer : B

Description : Anion gap is normal in (A) Hyperchloraemic metabolic acidosis (B) Diabetic ketoacidosis (C) Lactic acidosis (D) Uraemic acidosis

Last Answer : Answer : A

Description : Normal anion gap in plasma is about (A) 5 meq/L (B) 15 meq/L (C) 25 meq/L (D) 40 meq/L

Last Answer : Answer : B

Description : Anion gap is the difference in the plasma concentrations of (A) (Chloride) – (Bicarbonate) (B) (Sodium) – (Chloride) (C) (Sodium + Potassium) – (Chloride + Bicarbonate) (D) (Sum of cations) – (Sum of anions)

Last Answer : Answer : C

Description : The primary event in respiratory alkalosis is (A) Rise in pH (B) Decrease in pCO2 (C) Increase in plasma bicarbonate (D) Decrease in plasma chloride

Last Answer : Answer : B

Description : Respiratory alkalosis can occur in (A) Bronchial asthma (B) Collapse of lungs (C) Hysterical hyperventilation (D) Bronchial obstruction

Last Answer : Answer : C

Description : The initial event in respiratory acidosis is (A) Decrease in pH (B) Increase in pCO2 (C) Increase in plasma bicarbonate (D) Decrease in plasma bicarbonate

Last Answer : Answer : B

Description : Respiratory acidosis can occur in all of the following except (A) Pulmonary oedema (B) Hysterical hyperventilation (C) Pneumothorax (D) Emphysema

Last Answer : Answer : B

Description : Respiratory acidosis results from (A) Retention of carbon dioxide (B) Excessive elimination of carbon dioxide (C) Retention of bicarbonate (D) Excessive elimination of bicarbonate

Last Answer : Answer : A

Description : Buffering action of haemoglobin is mainly due to its (A) Glutamine residues (B) Arginine residues (C) Histidine residues (D) Lysine residues

Last Answer : Answer : C

Description : pKa of dihydrogen phosphate is (A) 5.8 (B) 6.1 (C) 6.8 (D) 7.1

Last Answer : Answer : C

Description : In a solution containing phosphate buffer, the pH will be 7.4, if the ratio of monohydrogen phosphate : dihydrogen phosphate is (A) 4 : 1 (B) 5 : 1 (C) 10 : 1 (D) 20 : 1

Last Answer : Answer : A

Description : Quantitatively, the most significant buffer system in plasma is (A) Phosphate buffer system (B) Carbonic acid-bicarbonate buffer system (C) Lactic acid-lactate buffer system (D) Protein buffer system

Last Answer : Answer : B

Description : At pH 7.4, the ratio of bicarbonate : dissolved CO2 is (A) 1 : 1 (B) 10 : 1 (C) 20 : 1 (D) 40 : 1

Last Answer : Answer : C

Description : In a solution having a pH of 7.4, the hydrogen ion concentration is (A) 7.4 nmol/L (B) 40 nmol/L (C) 56 nmol/L (D) 80 nmol/L

Last Answer : Answer : B

Description : A diuretic which is an aldosterone antagonist is (A) Spironolactone (B) Ethacrynic acid (C) Acetazolamide (D) Chlorothiazide

Last Answer : Answer : A

Description : Furosemide inhibits reabsorption of sodium and chloride in (A) Proximal convoluted tubules (B) Loop of Henle (C) Distal convoluted tubules (D) Collecting ducts

Last Answer : Answer : B

Description : Thiazide diuretics inhibit (A) Carbonic anhydrase (B) Aldosterone secretion (C) ADH secretion (D) Sodium reabsorption in distal tubules

Last Answer : Answer : D

Description : Diabetes insipidus results from (A) Decreased insulin secretion (B) Decreased ADH secretion (C) Decreased aldosterone secretion (D) Unresponsiveness of osmoreceptors

Last Answer : Answer : B

Description : Urinary water loss is increased in (A) Diabetes mellitus (B) Diabetes insipidus (C) Chronic glomerulonephritis (D) All of these

Last Answer : Answer : D

Description : Antidiuretic hormone (A) Is secreted by hypothalamus (B) Secretion is increased when osmolality of plasma decreases (C) Increases obligatory reabsorption of water (D) Acts on distal convoluted tubules and collecting ducts

Last Answer : Answer : D

Description : Obligatory reabsorption of water (A) Is about 50% of the total tubular reabsorption of water (B) Is increased by antidiuretic hormone (C) Occurs in distal convoluted tubules (D) Is secondary to reabsorption of solutes

Last Answer : Answer : D

Description : Recurrent vomiting leads to loss of (A) Potassium (B) Chloride (C) Bicarbonate (D) All of these

Last Answer : Answer : B

Description : The daily water loss through gastrointestinal tract in an adult is about (A) Less than 100 ml/day (B) 200 ml/day (C) 300 ml/day (D) 400 ml/day

Last Answer : Answer : A

Description : The water produced during metabolic reactions in an adult is about (A) 100 ml/day (B) 300 ml/day (C) 500 ml/day (D) 700 ml/day

Last Answer : Answer : B

Description : Colloid osmotic pressure of intracellular fluid is (A) Equal to that of plasma (B) More than that of plasma (C) More than that of plasma (D) Nearly zero WATER AND ELECTROLYTE BALANCE 285

Last Answer : Answer : B

Description : Oedema can occur when (A) Plasma Na and Cl are decreased (B) Plasma Na and Cl are increased (C) Plasma proteins are decreased (D) Plasma proteins are increased

Last Answer : Answer : C

Description : Oncotic pressure of plasma is about (A) 10 mm of Hg (B) 15 mm of Hg (C) 25 mm of Hg (D) 50 mm of Hg

Last Answer : Answer : C

Description : Oncotic pressure of plasma is due to (A) Proteins (B) Chloride (C) Sodium (D) All of these

Last Answer : Answer : A

Description : The highest concentration of proteins is present in (A) Plasma (B) Interstitial fluid (C) Interstitial fluid (D) Transcellular fluid

Last Answer : Answer : C

Description : Contribution of albumin to colloid osmotic pressure of plasma is about (A) 10% (B) 50% (C) 80% (D) 90%

Last Answer : Answer : C