Description : What is diffusion across a biological membrane? -Biology
Last Answer : answer:
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
Description : 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
Last Answer : C. Is affected by extent of ionization of drug molecules
Description : Substances insoluble in a membrane are carried across the membrane with the concentration gradient by means of a carrier molecule in a process known as: a) osmosis. b) diffusion. c) active transport. d) facilitated diffusion.
Last Answer : ANSWER: D -- FACILITATED DIFFUSION.
Description : The diffusion of solvent particles into a living cell
Last Answer : Ans. Endosmosis
Description : Pick out the wrong statement. (A) The binary diffusivity in liquids is of the order of 10 -5 cm2 /sec (B) Molecular diffusion in solid is much faster than that in liquids ( ... Poiseuille's law, the permeability decreases with increase in temperature for flow of a gas through a given capillary
Last Answer : (B) Molecular diffusion in solid is much faster than that in liquids
Description : Operating principle of cyclone separator is based on the action of __________ dust particles. (A) Diffusion of (B) Centrifugal force on (C) Gravitational force on (D) Electrostatic force on
Last Answer : (B) Centrifugal force on
Description : For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ... through ash layer (C) Chemical reaction (D) Either (A), (B) or (C)
Last Answer : (C) Chemical reaction
Description : For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, ... through ash layer (C) Chemical reaction (D) Either (A), (B) or (C)
Last Answer : (B) Diffusion through ash layer
Description : The random movement of particles in solution towar a uniform distribution is termed: a) osmosis b) repulsion c) diffusion d) facilitated diffusion
Last Answer : ANSWER: C -- DIFFUSION
Description : What is diffusion through a cell membrane? -Biology
Description : Osmosis is the diffusion of what substance through a cell membrane? -Biology
Description : Assertion `:-` The amount of `CO_(20` that can diffuse through the diffusion membrane per unit differnece in partial pressure is much higher compared
Last Answer : Assertion `:-` The amount of `CO_(20` that can diffuse through the diffusion membrane per unit ... . D. If both Assertion & Reason are false.
Description : $ Positive diffusion occurs against the concentration gradients. ! Osmosis does not require a semi-permeable membrane.
Last Answer : $ Positive diffusion occurs against the concentration gradients. ! Osmosis does not require a semi-permeable ... D. If both As and R are wrong.
Description : The diffusion membrane is made up of: (A) Thick columnar epithelium of alveoli (B) Endothelium of alveolar capillaries (C) Basement substances in betw
Last Answer : The diffusion membrane is made up of: (A) Thick columnar epithelium of alveoli (B) ... (C) Basement substances in between capillaries and alveoli
Description : How do diffusion and osmosis relate to the cell membrane?
Last Answer : Need answer
Description : Can small lipids diffuse into cell membrane through diffusion?
Last Answer : Feel Free to Answer
Description : Fatty acids can be transported into and out of cell membrane by (A) Active transport (B) Facilitated transport (C) Diffusion (D) Osmosis
Last Answer : B
Description : All the following processes occur rapidly in the membrane lipid bilayer except (A) Flexing of fatty acyl chains (B) Lateral diffusion of phospholipids (C) Transbilayer diffusion of phopholipids (D) Rotation of phospholipids around their long axes
Last Answer : C
Description : In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive (a) K+ into the cell (b) K+ and Na+ out of the cell (c) Na+ into the cell (d) Na+ out of the cell.
Last Answer : c) Na+ into the cell
Description : In the passive diffusion, solute molecules cross the membrane as a result of A- concentration difference B- pressure difference C- ionic difference D- all of these
Last Answer : concentration difference
Description : The process of diffusion of one liquid into the other through a semi permeable membrane is called (A) Viscosity (B) Osmosis (C) Surface tension (D) Cohesion
Last Answer : Answer: Option B
Description : 07. What is implied by «active transport»? a) Transport of drugs trough a membrane by means of diffusion b) Transport without energy consumption c) Engulf of drug by a cell membrane with a new vesicle formation
Last Answer : d) Transport against concentration gradient
Description : All the following processes occur rapidly in the membrane lipid bilayer except (A) Flexing of fatty acyl chains (B) Lateral diffusion of phospholipids (C) Transbilayer diffusion of phospholipids (D) Rotation of phospholipids around their long axes
Last Answer : (C) Transbilayer diffusion of phospholipids
Description : Barrier potential in a P-N junction is caused by (A) Thermally generated electrons and holes. (B) Diffusion of majority carriers across the junction. (C) Migration of minority carriers across the junction. (D) Flow of drift current.
Last Answer : (B) Diffusion of majority carriers across the junction.
Description : 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
Last Answer : A. Blood flow through the capillary
Description : By which of the following can movement of materials across animal cell membranes be accomplished? I Active transport, II Diffusion, III Pinocytosis (A) I only (B) II only (C) I and II only (D) All I, II, and III
Last Answer : Will be only two.
Description : Exchange of oxygen, carbon dioxide, nutrients and waste products from mother to fetus occurs through diffusion across the: a) chorionic villi (pron: core-e-on-ick villi) b) endometrium c) corpus luteum d) colostrum
Last Answer : ANSWER: A -- CHORIONIC VILLI
Description : The primary force moving water molecules from the blood plasma to the interstitial fluid is a. active transport b. cotransport with H+ c. facilitated diffusion d. cotransport with Na+ e. filtration
Last Answer : filtration
Description : Oxysomes or F0 – F1 particles occur on (a) thylakoids (b) mitochondrial surface (c) inner mitochondrial membrane (d) chloroplast surface.
Last Answer : (c) inner mitochondrial membrane
Description : Which of the following statements about inclusion bodies is incorrect? (a) They are not bound by any membrane. (b) These are involved in ingestion of food particles. (c) They lie free in the cytoplasm. (d) These represent reserve material in cytoplasm.
Last Answer : (b) These are involved in ingestion of food particles
Description : Which of the following represents the accepted method of cleaning dust and foreign particles from electrical equipment while limiting damage to electric components? A. Carefully wiping off the components ... the components. D. Using carbon tetrachloride as a cleaning solvent to clean the components.
Last Answer : Answer: C
Description : How do neutral solutes move across the plasma membrane? -Biology
Description : The potential difference across the membrane of a relaxed muscle fiber is called resting potential. It amounts to about
Last Answer : The potential difference across the membrane of a relaxed muscle fiber is called resting potential. It amounts to ... C. `100m V` D. `50- 100mV`
Description : What is the movement of material across a membrane called?
Description : Why can oxygen diffuse across a cell membrane but a protein?
Last Answer : Its too large
Description : What is the process in which water moves from an area of high concentration to an area of low concentration across a selectivity permeable membrane?
Description : Insulin increases the permeability of glucose across the plasma membrane of muscle cells by (A) Acting on adenylate cycle (B) By loosening the integrity of the membrane (C) Through Ca2 ... membrane cruting the hexose carries of intracellular organelles and making them fuse with the plasma membrane
Last Answer : Answer : D
Description : β-Subunits of insulin receptor are present (A) Outside the cell membrane (B) In the cell membrane (C) Across the cell membrane (D) In the cytosol
Last Answer : Answer : C
Description : α-Subunits of insulin receptor are present (A) Outside the cell membrane (B) In the cell membrane (C) Across the cell membrane (D) In the cytosol
Last Answer : Answer : A
Description : Receptors for thyroid hormones are present (A) On the cell membrane (B) Across the cell membrane (C) Inside the cells (D) In association with G-proteins
Description : The chemical inhibiting oxidative phosphorylation, Adependent on the transport of adenine nucleotides across the inner mitochondrial membrane is (A) Oligomycin (B) Atractyloside (C) Dinitrophenol (D) Pentachlorophenol
Last Answer : Answer : B
Description : Across a membrane phospholipids act as carrier of (A) Organic compounds (B) Inorganic ions (C) Nucleic acids (D) Food materials
Description : Long chain fatty acyl CoA esters are transported across the mitochondrial membrane by (A) cAMP (B) Prostaglandin (C) Carnitine (D) Choline
Description : Bulk transport across cell membrane is accomplished by (A) Phagocytosis (B) Pinocytosis (C) Extrusion (D) All of these
Last Answer : D
Description : Which of the following statement(s) is/are true concerning cellular ion channels? a. Ion channels are transmembrane proteins that form pores that can conduct ions across the plasma membrane b. ... undergo conformational changes between open states and closed states d. Ion channels can be blocked
Last Answer : Answer: a, b, c, d Ion channels are transmembrane proteins that form pores that can conduct ions across the plasma membrane. Ion channels are formed by membrane-spanning peptides that are arranged ... be blocked by ions or organic compounds that enter the channel, bind there, and occlude the pore
Description : Which of the following statement(s) is/are true concerning water movement across cell membranes? a. Water moves only actively through cell membrane transport proteins b. For most cells of ... cells such as the glomerulus of the kidney actively transport water to maintain hydrostatic pressure
Last Answer : Answer: b, c The energetics of water transport across cell membranes is simplified by the fact that water moves only passively due to gradients of hydrostatic pressure or water ... water is distributed at equilibrium. Water distribution is determined entirely by solute to solute distribution
Description : What is mass transportation across the cell membrane ?
Last Answer : Mass transportation is the entrance or the exiting of substances in or from the cell engulfed by portions of membrane. The fusion of internal substance-containing membranous vesicles with the cell ... cell after they have been engulfed by projections of the membrane is called endocytosis.