Active transport of a substance across biological membranes has the following characteristics except: A. It is specific B. It is pH dependent C. It is saturable D. It requires metabolic energy

Active transport of a substance across biological membranes has the following characteristics except: A. It is specific B. It is pH dependent C. It is saturable D. It requires metabolic energy
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B. It is pH dependent
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Active transport of a substance across biological membranes has the following characteristics except: A. It is specific B. It is pH dependent C. It is saturable D. It requires metabolic energy

Description : Active transport of a substance across biological membranes has the following characteristics except: A. It is specific B. It is pH dependent C. It is saturable D. It requires metabolic energy

Last Answer : B. It is pH dependent

Majority of drugs cross biological membranes primarily by: A. Passive diffusion B. Facilitated diffusion C. Active transport D. Pinocytosis

Description : Majority of drugs cross biological membranes primarily by: A. Passive diffusion B. Facilitated diffusion C. Active transport D. Pinocytosis

Last Answer : A. Passive diffusion

Majority of drugs cross biological membranes primarily by: A. Passive diffusion B. Facilitated diffusion C. Active transport D. Pinocytosis

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Last Answer : C. Is affected by extent of ionization of drug molecules

3 Diffusion of drugs across cell membrane: A. Is dependent upon metabolic activity of the cell B. Is competitively inhibited by chemically related drugs C. Is affected by extent of ionization of drug molecules D. Exhibits saturation kinetics

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What is the energy source used in active transport through biological membranes ?

Description : What is the energy source used in active transport through biological membranes ?

Last Answer : The energy necessary for active transport (against the concentration gradient of the transported substance) to occur comes from ATP molecules. The active transportation uses chemical energy from ATP.

The most important factor which governs diffusion of drugs across capillaries other than those in the brain is: A. Blood flow through the capillary B. Lipid solubility of the drug C. pKa value of the drug D. pH of the medium

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Last Answer : A. Blood flow through the capillary

The most important factor which governs diffusion of drugs across capillaries other than those in the brain is: A. Blood flow through the capillary B. Lipid solubility of the drug C. pKa value of the drug D. pH of the medium

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Which of the following is not a feature of active transport of solutes in plants ? (a) Occurs against concentration gradient (b) Non-selective (c) Occurs through membranes (d) Requires ATP

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Last Answer : Non-selective

Active and passive transports across cell membrane differ in (a) passive transport is nonselective(b) passive transport is along the concentration gradient while active transport is due to metabolic energy (c) active transport is more rapid (d) passive transport is confined to anions while active transport is confined to cations.

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Last Answer : C. A toxic effect which endangers life by markedly affecting vital functions is called poisoning

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Explain active transport of substances across cell membranes. -Biology

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Last Answer : answer:

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Glucose uptake by liver cells is (A) Energy-consuming (B) A saturable process (C) Insulin-dependent (D) Insulin-independent

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Last Answer : C. High plasma protein binding

The following attribute of a drug tends to reduce its volume of distribution: A. High lipid solubility B. Low ionisation at physiological pH values C. High plasma protein binding D. High tissue binding

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Last Answer : C. High plasma protein binding

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The pharmacokinetics of drugs in the neonate differs from that in adults, because their: A. Intestinal transit is fast B. Drug metabolizing enzymes are overactive C. Tubular transport mechanisms are not well developed D. Glomerular filtration rate is high

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Induction of drug metabolizing enzymes involves: A. A conformational change in the enzyme protein to favour binding of substrate molecules B. Expression of enzyme molecules on the surface of hepatocytes C. Enhanced transport of substrate molecules into hepatocytes D. Increased synthesis of enzyme protein

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The pharmacokinetics of drugs in the neonate differs from that in adults, because their: A. Intestinal transit is fast B. Drug metabolizing enzymes are overactive C. Tubular transport mechanisms are not well developed D. Glomerular filtration rate is high

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Induction of drug metabolizing enzymes involves: A. A conformational change in the enzyme protein to favour binding of substrate molecules B. Expression of enzyme molecules on the surface of hepatocytes C. Enhanced transport of substrate molecules into hepatocytes D. Increased synthesis of enzyme protein

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Drugs acting through receptors exhibit the following features except: A. Structural specificity B. High potency C. Competitive antagonism D. Dependence of action on lipophilicity

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Transdermal drug delivery systems offer the following advantages except: A. They produce high peak plasma concentration of the drug B. They produce smooth and nonfluctuating plasma concentration of the drug C. They minimise interindividual variations in the achieved plasma drug concentration D. They avoid hepatic first-pass metabolism of the drug

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Actions of pilocarpine include the following except: A. Sweating B. Salivation C. Miosis D. Cycloplegia

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Last Answer : B. Rise in blood pressure

Use of an emetic to remove the ingested poison is contraindicated in following poisonings except that by: A. Strychnine B. Caustic soda C. Ferrous sulfate D. Kerosene

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The following statement is not true of log dose-response curve: A. It is almost linear except at the ends B. It is a rectangular hyperbola C. It facilitates comparison of different agonists D. It can help in discriminating between competitive and noncompetitive antagonists

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Description : Drugs acting through receptors exhibit the following features except: A. Structural specificity B. High potency C. Competitive antagonism D. Dependence of action on lipophilicity

Last Answer : D. Dependence of action on lipophilicity

Transdermal drug delivery systems offer the following advantages except: A. They produce high peak plasma concentration of the drug B. They produce smooth and nonfluctuating plasma concentration of the drug C. They minimise interindividual variations in the achieved plasma drug concentration D. They avoid hepatic first-pass metabolism of the drug

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With respect to lipoprotein transport and metabolism in the body, the following statements are correct EXCEPT: 1) Arterial walls contain cells with LDL receptors. 2) Cholesterol is required for the formation of red blood cell membranes. 3) Chylomicrons are synthesized in the liver. 4) HDL is assembled in the extracellular space. 5) VLDL transformation to LDL occurs in adipose tissue.

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With respect to lipoprotein transport and metabolism in the body, the following statements are correct EXCEPT: 1) Arterial walls contain cells with LDL receptors. 2) Cholesterol is required for the formation of red blood cell membranes. 3) Chylomicrons are synthesized in the liver. 4) HDL is assembled in the extracellular space. 5) VLDL transformation to LDL occurs in adipose tissue.

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Which of the following adverse drug reactions is due to a specific genetic abnormality: A. Tetracycline induced sunburn like skin lesions B. Quinidine induced thrombocytopenia C. Metoclopramide induced muscle dystonia D. Primaquine induced massive haemolysis

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Last Answer : D. Primaquine induced massive haemolysis

What is true in relation to drug receptors: A. All drugs act through specific receptors B. All drug receptors are located on the surface of the target cells C. Agonists induce a conformational change in the receptor D. Partial agonists have low affinity for the receptor

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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

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

The horizontal line which cuts across 'L1' shown in figure 'A' of the illustration indicates a/an ______________. EL-0091 A. iron core B. saturable core C. air gap D. capacitive coupling

Description : The horizontal line which cuts across 'L1' shown in figure 'A' of the illustration indicates a/an ______________. EL-0091 A. iron core B. saturable core C. air gap D. capacitive coupling

Last Answer : Answer: B

What are biological membranes? -Biology

Description : What are biological membranes? -Biology

Last Answer : answer:

Which of the following features is predicted by the Nicolson–Singer fluid mosaic model of biological membranes? (A) Membrane lipids do not diffuse laterally (B) Membrane lipid is primarily in a monolayer form (C) Membrane lipids freely flip-flop (D) Membrane proteins may diffuse laterally

Description : Which of the following features is predicted by the Nicolson–Singer fluid mosaic model of biological membranes? (A) Membrane lipids do not diffuse laterally (B) Membrane lipid is primarily in a monolayer form (C) Membrane lipids freely flip-flop (D) Membrane proteins may diffuse laterally

Last Answer : Answer : D

The following is true of clarithromycin except: A. It produces less gastric irritation and pain than erythromycin B. It is the most active macrolide antibiotic against Helicobacter pylori C. It does not interact with terfenadine or cisapride to cause cardiac arrhythmias D. It exhibits dose dependent elimination kinetics

Description : The following is true of clarithromycin except: A. It produces less gastric irritation and pain than erythromycin B. It is the most active macrolide antibiotic against Helicobacter pylori ... terfenadine or cisapride to cause cardiac arrhythmias D. It exhibits dose dependent elimination kinetics

Last Answer : C. It does not interact with terfenadine or cisapride to cause cardiac arrhythmias

All the following statements describing lipids are true except (A) They usually associate by covalent interactions (B) They are structurally components of membranes (C) They are an intracellular energy source (D) They are poorly soluble in H2O

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Last Answer : Answer : A

The process by which cell can take in fluid and molecules too large to be carried across the plasma membrane by active transport is called a. phagocytosis b. Pinocytosis c. absorption d. diffusion

Description : The process by which cell can take in fluid and molecules too large to be carried across the plasma membrane by active transport is called a. phagocytosis b. Pinocytosis c. absorption d. diffusion

Last Answer : Pinocytosis