Description : The absorption of intact protein from the gut in the foetal and newborn animals takes place by (A) Pinocytosis (B) Passive diffusion (C) Simple diffusion (D) Active transport
Last Answer : A
Description : Glucose is taken back from glomerular filtrate through (a) active transport (b) passive transport (c) osmosis (d) diffusion
Last Answer : (a) active transport
Description : Sodium ions are "pumped" from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of (A) Diffusion (B) Passive transport (C) Osmosis (D) Active transport
Last Answer : (D) Active transport
Description : The exchange of material takes place (A) Only by diffusion (B) Only by active transport (C) Only by pinocytosis (D) All of these
Last Answer : D
Last Answer : (D) All of these
Description : The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and / or characteristic. (a) C - ... air. (d) B - Pleural membrane - Surround ribs on both sides to provide cushion against rubbing.
Last Answer : (a) C - Alveoli - Thin walled vascular bag like structures for exchange of gases.
Description : When water enters in roots due to diffusion, is termed as (a) osmosis (b) passive absorption (c) endocytosis (d) active absorption.
Last Answer : (b) passive absorption
Description : The exchange of gases in mammals takes place in the (a) larynx (b) trachea (c) alveoli (d) bronchi
Last Answer : Ans:(c)
Description : The movement of glucose into a cell occurs by a. Facilitated diffusion. b. Active transport. c. Simple diffusion. d. Phospholipid exchange.
Last Answer : b. Active transport.
Description : Thyroid gland takes up circulating iodine (A) By simple diffusion (B) By facilitated diffusion (C) By active uptake (D) In exchange for chloride
Last Answer : Answer : C
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 : The movement of ions against the concentration gradient will be (a) active transport (b) osmosis (c) diffusion (d) all of the above.
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 : 04. The main mechanism of most drugs absorption in GI tract is: a) Active transport (carrier-mediated diffusion) b) Filtration (aqueous diffusion) c) Endocytosis and exocytosis d) Passive diffusion (lipid diffusion)
Last Answer : PHARMACOKINETICS
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
Last Answer : C. Is affected by extent of ionization of drug molecules
Description : Natural L-isomers of amino acids are absorbed from intestine by (A) Passive diffusion (B) Simple diffusion (C) Faciliated diffusion(D) Active process
Last Answer : Answer : D
Description : How is the alveoli adapted for gas exchange between air in the lungs and blood in the capillaries?
Last Answer : Need answer
Description : The figure given below shows a small part of human lung where exchange of gases takes place. Select the option which represents labelled part (A, B, C or D) correctly identified along with its function. ... Exchange of O2 and CO2 takes place here (d) B : Red blood cells - Transport of CO2 mainly
Last Answer : (b) A : Alveolar cavity - Main site of exchange of respiratory gases
Description : The Correct Statements with reference to single called organisms are (i) Complex substances are not broken down in to simpler substances. (ii) Simple diffusion is sufficient to meet the requirement of exchange of gases. (iii) Specialized ... b) (ii) and (iii) (c) (ii) and (iv) (d) (i) and (iv)
Last Answer : Answer: (c)
Description : Fructose is absorbed into the blood through mucosa cells of intestine by the process called (a) active transport (b) facilitated transport (c) simple diffusion (d) co-transport mechanism.
Last Answer : (b) facilitated transport
Description : How are the alveoli designed to maximise the exchange of gases ? -Biology
Last Answer : (i) The alveoli are thin walled and richly supplied with a network of blood vessels to facilitate exchange of gases between blood and the air filled in alveoli. (ii) Alveoli have balloon-like structure. Hence, provide maximum surface for exchange of gases.
Description : How are the alveoli designed to maximise the exchange of gases? -Biology
Last Answer : Alveoli are small pouches or sacs like structure. They are surrounded by blood capillaries. Thus a large amount of air is brought in contact with the air in the lungs. More than millions of ... area for the exchange of gases. The availability of large surface area maximises the exchange of gases.
Description : Normal diffusion capacity of gases in human lungs in order is :-
Last Answer : Normal diffusion capacity of gases in human lungs in order is :- A. `O_(2) gt N_(2) gt CO_(2)` B. `CO_(2) gt ... CO_(2)` D. `O_(2) gt CO_(2) gt N_(2)`
Description : When does diffusion of gases takes place?
Last Answer : Diffusion of gases takes place when the gases do not react with one another.
Description : Following processes can occur across the cell membrane at the same time. a. Osmosis b. Active transport c. Both d. None of them
Last Answer : Both
Description : Water molecules enter plant epidermal cells by: a) osmosis b) active transport c) translocation d) transpiration
Last Answer : ANSWER: A -- OSMOSIS
Description : The name of the process by which oil glands in mammalian skins secrete oils is: a) active transport b) apocrine secretion c) holocrine secretion d) osmosis
Last Answer : ANSWER: C -- HOLOCRINE SECRETIONÂ
Description : Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning. -Biology
Last Answer : Alveoli Nephron 1. Alveoli are functional unit of lungs. 1. Nephrons are functional unit of kidney. 2. A mature lung has about 30 crore alveoli. 2. A kidney has about ... of capillaries in alveoli. 4. The Bowman's capsule in nephron regulates the concentration of water and salts.
Description : Assertion `:-` Bohr effect occur at the level of alveoli of lungs. Reason `:-` High concentratio of `CO_(2)` allow dissociation of oxyhaemoglobin.
Last Answer : Assertion `:-` Bohr effect occur at the level of alveoli of lungs. Reason `:-` High concentratio ... False. D. If both Assertion & Reason are false.
Description : Presence of large number of alveoli around alveolar duncts opening into bronchioles in mommanlian lungs is
Last Answer : Presence of large number of alveoli around alveolar duncts opening into bronchioles in mommanlian ... system of ventilation with little residual air
Description : Common cold differs from pneumonia in that (a) pneumonia is a communicable disease whereas the common cold is a nutritional deficiency disease (b) pneumonia can be prevented by a live attenuated ... infects alveoli whereas the common cold affects nose and respiratory passage but not the lungs.
Last Answer : (d) pneumonia pathogen infects alveoli whereas the common cold affects nose and respiratory passage but not the lungs.
Description : The partial pressure of oxygen in the alveoli of the lungs is (a) equal to that in the blood (b) more than that in the blood (c) less than that in the blood (d) less than that of carbon dioxide.
Last Answer : (b) more than that in the blood
Description : In man and mammals, air passes from outside into the lungs through (a) nasal cavity, larynx, pharynx, trachea, bronchi, alveoli (b) nasal cavity, larynx, pharynx, trachea, bronchioles, ... bronchioles, bronchi, alveoli (d) nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli.
Last Answer : (d) nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli.
Description : Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of (a) inspiratory reserve volume (b) tidal volume (c) expiratory reserve volume (d) residual volume.
Last Answer : (d) residual volume.
Description : Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of: (1) Inspiratory Reserve Volume (2) Tidal Volume (3) Expiratory Reserve Volume (4) Residual Volume
Last Answer : (4) Residual Volume
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 are the lungs designed in human beings to maximise the area for exchange of gases ? -Biology
Last Answer : Within the lungs, the air passage divides into smaller and smaller tubes, called bronchi which in turn form bronchioles. The bronchioles terminate in balloon-like structures, called alveoli. The ... vary thin walls and contain an extensive network of blood vessels to facilitate exchange of gases.
Description : Explain the exchange of gases in lungs?
Last Answer : At the lungs exchange of carbon dioxide and oxygen takes place in alveoli. This process takes place by the process of diffusion. In lungs pressure of carbon dioxide is greater than pressure of carbon ... The oxygen first diffuses in fluid present in the walls of alveoli and then into the blood.
Description : In single celled organisms diffusion is sufficient to meet all their requirements of food, exchange of gases or removal of wastes but it is not in case of multicellular organisms. Explain the reason for this difference. -Biology
Last Answer : Unicellular organisms can absorb sufficient oxygen because of its complete contact with the atmosphere, but in multicellular organisms the rate of absorption and diffusion becomes very less because all ... of oxygen to sustain life processes which cannot be fulfilled by the process of diffusion.
Description : Why the process of diffusion is important in exchange of gases and water in the animal and plant cell ? -Biology
Last Answer : Diffusion is an important in exchange of gases and water in the life of a cell, in addition to this the cell also obtain nutrition from its environment.
Description : The respiratory membranes facilitates the exchange of respiratory gases through diffusion . Oxygen enters the deoxygenated blood through diffusion bec
Last Answer : The respiratory membranes facilitates the exchange of respiratory gases through diffusion . Oxygen enters the ... it 40mm Hg and 46 mm Hg respectively
Description : What is the difference between active and passive transport?
Last Answer : A: Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and involves the movement of substances down their concentration gradient.
Description : What is the difference between a passive and active transport?
Last Answer : A: Passive transport does not require energy and involves the movement of molecules from high to low concentration, while active transport requires energy and involves the movement of molecules from low to high concentration.
Description : What is the difference between active and passive transport? -Biology
Last Answer : answer:
Description : What is the relation between concentration gradient and active and passive transport ?
Last Answer : Passive transport is the movement of substances across membranes in favor of their concentration gradient, i.e., from a more concentrated region to a less concentrated region. Active transport, in ... two regions while passive transport acts in a manner to reduce the concentration gradient.
Description : 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 ... (d) passive transport is confined to anions while active transport is confined to cations.
Last Answer : (b) passive transport is along the concentration gradient while active transport is due to metabolic energy
Description : Function of companion cells is (a) providing energy to sieve elements for active transport (b) providing water to phloem (c) loading of sucrose into sieve elements by passive transport (d) loading of sucrose into sieve elements.
Last Answer : (d) loading of sucrose into sieve elements.