Description : The basic structure of cell membranes (a) Is a lipid bilayer that serves as a barrier to water soluble molecules (b) Differs ultra structurally for internal and external membranes ... dispersed within a protein bilayer (d) Is visualised as bilaminar structure with transmission electron microscopy
Last Answer : Ans:(a)
Description : Eukaryotic cells have extensive intracellular membranes, termed the endomembrane system, which divide the cell into structurally and functionally distinct compartments, or organelles. These include the inner cell ... . Name a cellular component whose membrane is not part of the endomembrane system.
Last Answer : Mitochondria; also chloroplasts
Description : All the following statements about steroid hormones are true except (A) They are hydrophobic (B) They require carriers to transport them in circulation (C) Their receptors are intracellular (D) They require cyclic AMP as second messenger
Last Answer : Answer : D
Description : According to widely accepted fluid mosaic model cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several ... domains of the membrane. (d) Many proteins remain completely embedded within the lipid bilayer.
Last Answer : (b) Proteins can also undergo flip-flop movements in the lipid bilayer.
Description : A striking feature of living cells is a marked difference between the composition of the cytosol and the extracellular milieu. Which of the following statement(s) concerning the mechanisms of maintenance ... d. The selectivity of cell membranes relates only to ions and not organic compounds
Last Answer : Answer: a The survival of the cell requires that cytosolic composition be maintained within narrow limits, despite the constant influx of nutrients and the simultaneous outflow of waste. A ... be altered drastically as a result of regulatory or signaling processes that occur within the cell
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
Description : Lipids have the following properties: (A) Insoluble in water and soluble in fat solvent (B) High energy content (C) Structural component of cell membrane (D) All of these
Description : Which of the following statements about the preparation and storage of blood components is/are true? A. Solutions containing citrate prevent coagulation by binding calcium. B. The ... cells includes development of acidosis, hyperkalemia, and decreased intracellular 2,3DPG (diphosphoglycerate).
Last Answer : Answer: ABD DISCUSSION: After blood has been collected from a donor, it is anticoagulated with a solution containing citrate, which acts by binding calcium. Blood is then separated into its ... transfusion or produce effects other than those predicted based on the content of the unit of blood
Description : All the following statements about acetyl CoA carboxylase are true except: (A) It is activated by citrate (B) It is inhibited by palmitoyl CoA (C) It can undergo covalent modification (D) Its dephosphorylated form is inactive
Description : 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 ... is assembled in the extracellular space. 5) VLDL transformation to LDL occurs in adipose tissue.
Last Answer : Answers-3 Chylomicrons are formed in the gut from exogenous triacylglycerols and cholesterol. They are released into the lymph and thereby enter the blood.They are not formed in the liver.
Description : All of the following statements about uric acid are true except (A) It is a catabolite of purines (B) It is excreted by the kidneys (C) It is undissociated at pH above 5.8 (D) It is less soluble than sodium urate
Last Answer : Answer : C
Description : Which of the following statements is not true about phospholipids? (a) They are similar to triacylglycerols except that the middle OH group of glycerol reacts with a phosphate rather than with a ... is a phospholipid. (d) The C-2 carbon of glycerol in phosphoacylglycerols has the R configuration
Last Answer : They are similar to triacylglycerols except that the middle OH group of glycerol reacts with a phosphate rather than with a fatty acid
Description : The following points about microfilaments are true except (A) They form cytoskeleton with microtubules (B) They provide support and shape (C) They form intracellular conducting channels (D) They are involved in muscle cell contraction
Last Answer : C
Description : Water soluble molecular aggregates of lipids are known as (A) Micelle (B) Colloids (C) Sphingol (D) Mucin
Last Answer : Answer : A
Description : The following local anaesthetic is poorly water soluble, PABA derivative and primarily used for anorectal lesions, wounds and ulcers: A. Benzocaine B. Dibucaine C. Procaine D. Benoxinate
Last Answer : A. Benzocaine
Description : Marked redistribution is a feature of: A. Highly lipid soluble drugs B. Poorly lipid soluble drugs C. Depot preparations D. Highly plasma protein bound drugs
Last Answer : A. Highly lipid soluble drugs
Description : Cell recognition and adhesion occur due to biochemicals of cell membranes named (a) proteins (b) lipids (c) proteins and lipids (d) glycoproteins and glycolipids.
Last Answer : (d) glycoproteins and glycolipids.
Description : 06. A hydrophilic medicinal agent has the following property: a) Low ability to penetrate through the cell membrane lipids b) Penetrate through membranes by means of endocytosis c) Easy permeation through the blood-brain barrier d) High reabsorption in renal tubules
Last Answer : a) Low ability to penetrate through the cell membrane lipids
Description : Arrange the following types of interactions in correct order of their increasing strength : Covalent, hydrogen bonding, Vander Waals, dipole dipole
Last Answer : Vander Waals < dipole dipole < hydrogen bonding < covalent.
Description : Which of the following is the strongest interaction? (a) a covalent bond (b) dipole-dipole interactions (c) hydrogen bonding (d) van der Waals
Last Answer : a covalent bond
Description : All the following statements apply to quats except: a. They React With Cell Membranes. b. They Are Positively Charged Molecules. c. They Are Types Of Soaps. d. They Can Be Used As Disinfectants.
Last Answer : c. They Are Types Of Soaps
Description : Consider the following statements - 1. Cuba is considered the sugar bowl of the world 2. Sugar was a rare commodity in Europe till the middle ages 3. Honey is a rich source of vitamins and minerals 4. All green plants synthesize sugar ... is/are true? (a) Only 1 (b) 1 and 3 (c) 2 and 3 (d) 2 and 4
Last Answer : Ans:(d)
Description : Pick out the wrong statement. (A) Cellulose acetate membranes are used in dialysis process (B) Elutriation process refers to when the soluble material is largely concentrated on the surface of an ... that various streamflow from one to another (D) Zirconia probe is used for the humidity measurement
Last Answer : (D) Zirconia probe is used for the humidity measurement
Description : Cell membranes a. consist almost entirely of protein molecules b. are impermeable to fat-soluble substances c. in some tissues permit the transport of glucose at a greater rate in the presence of ... to electrolytes but not to proteins e. have a stable composition throughout the life of the cell
Last Answer : in some tissues permit the transport of glucose at a greater rate in the presence of insulin
Description : 05. What kind of substances can’t permeate membranes by passive diffusion? a) Lipid-soluble b) Non-ionized substances c) Hydrophobic substances d) Hydrophilic substances 06. A hydrophilic medicinal agent
Last Answer : d) Hydrophilic substances
Description : Biological functions of lipids include (A) Source of energy (B) Insulating material (C) Maintenance of cellular integrity (D) All of these
Description : Fluidity of membranes is increased by the following constituent except (A) Polyunsaturated fatty acids (B) Saturated fatty acids (C) Integral proteins (D) Cholesterol
Description : Mark the compound which possesses ionic, covalent and coordinate bonds. (1) NH4C1 (2) SO3 (3) SO2 (4) H2O
Last Answer : (1) NH4C1 Explanation: Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Description : Which of the following is the best description of propane, CH3CH2CH3, at room temperature? (a) liquid, soluble in H2O (b) gas, soluble in gasoline (c) liquid, soluble in gasoline (d) gas, soluble in water
Last Answer : gas, soluble in gasoline
Description : The fo l low ing substances are ce l l inclusions except (A) Melanin (B) Glycogen (C) Lipids (D) Centrosome
Last Answer : D
Description : During each cycle of on going fatty acid oxidation, all the following compounds are generated except (A) H2O (B) Acetyl CoA (C) Fatty acyl CoA (D) NADH FATS AND FATTY ACID METABOLISM 103
Description : During each cycle of β-oxidation of fatty acid, all the following compounds are generated except (A) NADH (B) H2O (C) FAD (D) Acyl CoA
Last Answer : Answer : B
Description : Milk is a good source of all water-soluble vitamins except for ___ a) Cyanocobalamin b) Riboflavin c) Ascorbic Acid d) Thiamine
Last Answer : c) Ascorbic Acid
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
Description : Most covalent compounds (a) Behave like electrolytes in the molten state (b) Have high melting and boiling points (c) Are hard substances because of strong covalent bonds (d) Are more soluble in non-polar solvents than in polar solvents
Description : What are the components with which the Cisco Aironet components can associate?
Last Answer : Not all Aironet devices can associate with all other types of Aironet devices. For instance, the Client Adapter card cannot form a wireless association with a Workgroup Bridge (WGB). Refer to Cisco Aironet Hardware Association Matrix for a complete description of association capabilities.
Description : Ceftriaxone has all the following attributes except: A. It has a long plasma half life of 8 hours B. It can cause bleeding by prolonging prothrombin time C. It has attained high cure rates in multiresistant typhoid infection D. It penetrates CSF poorly and therefore not effective in meningitis
Last Answer : D. It penetrates CSF poorly and therefore not effective in meningitis
Description : Plants usually do not grow well in poorly drained soils because: a. Oxygen content is low in poorly drained soils b. The organic matter content of poorly drained soils is too high c. Poorly drained soils warm too quickly in spring d. Plant roots become engorged with water in poorly drained soils
Last Answer : Oxygen content is low in poorly drained soils
Description : When describing a removable partial denture, the minor connector refers to:** A. Rigid components anterior to the premolar teeth B. Flexible components, in contrast to rigid major connectors ... components to the major connector D. The components of the denture base which provides reciprocation
Last Answer : C. Smaller connectors which connect denture components to the major connector
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.
Description : Which of the following types of molecules are the major structural components of cell membranes?
Last Answer : a. Phospholipids and proteins. ///// b. Phospholipids and cellulose.//// c. Nucleic acids and proteins.//// d. Glycoproteins and cholesterol.
Description : What are the three major components of glycerophospholipids, the main component of lipid bilayers that comprise cellular membranes?
Last Answer : Glycerol, a phosphate group, fatty acid chains
Description : Lecithins are soluble in ordinary solvents except (A) Benzene (B) Ethyl alcohol (C) Methyl alcohol (D) Acetone
Description : Which of the following statements is not true when describing a successful strategy? Select one: a. It fulfills its CSR obligations. b. It provides the means for renewing competitive advantage c. It addresses changes in the external environment d. It guarantees long term survival
Last Answer : It fulfills its CSR obligations
Description : Which of the following statements is not true when describing a successful strategy? a) It provides some property that is unique or distinctive b) It provides the means for renewing competitive advantage c) It addresses changes in the external environment d) It guarantees long term survival
Last Answer : It guarantees long term survival
Description : Which of the following statements is not true when describing a successful strategy? A. It provides some property that is unique or distinctive B. It provides the means for renewing competitive advantage C. It addresses changes in the external environment D. It guarantees long term survival
Last Answer : It provides the means for renewing competitive advantage