Description : Which of the following component of respiratory chain is not attached to the inner mitochondrial membrane? (A) Coenzyme Q (B) Cytochrome c (C) Both (A) and (B) (D) None of these
Last Answer : Answer : C
Description : Q. What are the components of membrane that alter the fluidity?
Last Answer : A. Cholesterol and unsaturated fatty acids
Description : Q. What do you mean by fluidity of the membrane?
Last Answer : A. The lipid bilayer shows free lateral movement of its components; but flip-flop movement is restricted
Description : Which of the following statement is correct about membrane cholesterol? (A) The hydroxyl group is located near the centre of the lipid layer (B) Most of the cholesterol is in the form ... forms a rigid, planar structure (D) The hydrocarbon chain of cholesterol projects into the extracellular fluid
Last Answer : C
Description : What term describes the structure of a cell plasma membrane because of its oily nature and embebbed proteins?
Last Answer : fluid mosaic
Description : Keeping in view the fluid mosaic model' for the structure of cell membrane, which one of the following statement is correct with respect to the movements of lipids and proteins from one lipid ... ) Both lipids and proteins can flip-flop (d) While lipids can rarely flip-flop, proteins cannot.
Last Answer : (d) While lipids can rarely flip-flop, proteins cannot.
Description : Archaebacteria differ from eubacteria in (a) cell membrane structure (b) mode of nutrition (c) cell shape (d) mode of reproduction.
Last Answer : (a) cell membrane structure
Description : The structure within a cell that distinguishes the cell as being eukaryotic, and prokaryotic is (A) Ribosomes (B) Cell membrane (C) Cell wall (D) Nucleus
Last Answer : (D) Nucleus
Description : The signal sequence of proteins is cleaved off (A) On the ribosomes immediately after synthesis (B) In the endoplasmic reticulum (C) During processing in Golgi apparatus (D) During passage through the cell membrane
Last Answer : Answer : B
Description : SRP receptors involved in protein export are present on (A) Ribosomes (B) Endoplasmic reticulum (C) Golgi appartus (D) Cell membrane
Description : STAT proteins are (A) Thermostat proteins of brain (B) Glucostat proteins of hepatocyte cell membrane (C) Short term activators of translation (D) Signal transduction and activators of transcription
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
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 : All the following statements about ACTH are true except (A) It is a tropic hormone (B) Its target cells are located in adrenal cortex (C) Its receptors are located in the cell membrane (D) Its second messenger is inositol triphosphate
Description : What are the functions of potassium? (A) In muscle contraction (B) Cell membrane function (C) Enzyme action (D) All of these
Description : Phospholipids are important cell membrane components since (A) They have glycerol (B) Form bilayers in water (C) Have polar and non-polar portions (D) Combine covalently with proteins
Description : Phospholipids are important cell membrane components because (A) They have glycerol (B) They can form bilayers in water (C) They have both polar and non polar potions (D) They combine covalently with proteins
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 : Lipoprotein present in cell membrane is by nature: (A) Hydrophilic (B) Hydrophobic (C) Both (A) and (B) (D) None of these
Description : The importance of phospholipids as constituent of cell membrane is because they possess (A) Fatty acids (B) Both polar and nonpolar groups (C) Glycerol (D) Phosphoric acid
Description : Binding of acetylcholine to its receptors increases the permeability of cell membrane to (A) Ca++ (B) Na+ (C) K+ (D) Na+ and K+
Description : Binding of gamma-aminobutyric acid to its receptors in brain increases the permeability of cell membrane to (A) Cl– (B) Na+ (C) K+ (D) Ca++
Description : The power house of the cell is (A) Nucleus (B) Cell membrane (C) Mitochondria (D) Lysosomes
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 ability of the cell membrane to act as a selective barrier depends upon (A) The lipid composition of the membrane (B) The pores which allows small molecules (C) The special mediated transport systems (D) All of these
Last Answer : D
Description : Bulk transport across cell membrane is accomplished by (A) Phagocytosis (B) Pinocytosis (C) Extrusion (D) All of these
Description : What is the structure of a biological membrane? -Biology
Last Answer : answer:
Description : The figure given below show the structure of plasma membrane, with its parts labelled from A to E, Identify the correct :-
Last Answer : The figure given below show the structure of plasma membrane, with its parts labelled from A ... . `Dto` Its polar tail contain saturated hydrocarbon
Description : Explain the structure of plasma membrane on the basis of Fluid mosaic model.
Last Answer : Explain the structure of plasma membrane on the basis of Fluid mosaic model.
Description : What structure join with the cells membrane during exocytosis?
Last Answer : Need answer
Description : The structure which helps in the nutrition of the Embryo is – (1) Yolk sac (2) Amniotic membrane (3) Crypts (4) Placenta
Last Answer : (1) Yolk sac Explanation: The yolk sac is a membranous sac attached to an embryo, providing early nourishment. It functions as the developmental circulatory system of the human embryo, ... It carries out transfer of nutrients in weeks 2 and 3 when the uteroplacental circulation is established
Description : Select the answer with correct matching of the structure, its location and function. Structure Location Function (a) Eustachian Anterior Equalizes air tube part of pressure on internal ear either sides ... the place Rods and cones where optic are present but nerve leaves inactive here the eye
Last Answer : (c) Hypothal Forebrain Controls body -amus temperature, urge for eating and drinking
Description : The figure below shows the structure of a mitochondrion with its four parts labelled A, B, C and D. Select the part correctly matched with its function. D B A C (a) D (outer ... possesses single circular DNA molecule and ribosomes (d) A (matrix) - major site for respiratory chain enzyme
Last Answer : (b) B (inner membrane) – forms infoldings called cristae
Description : Which of the following is true for nucleolus? (a) Larger nucleoli are present in dividing cells. (b) It is a membrane-bound structure. (c) It takes part in spindle formation. (d) It is a site for active ribosomal RNA synthesis.
Last Answer : (d) It is a site for active ribosomal RNA synthesis.
Description : The gram-positive bacteria lack __________ structure/component? A.outer membrane B.murein C.teichoic acid D.plasma membrane
Last Answer : A.outer membrane
Description : By which of the following means antifungal chemotherapeutic agents may affect fungi? A- Interfere with nuclear division by preventing the aggregation of microtubules needed for mitosis B- ... membrane-bound enzymes like thoseinvolved in nutrient transport and chitin synthesis D- all of these
Last Answer : all of these
Description : Which of the following statement describes plasmids? A- Another name for a protoplast B- A complex membrane structure that covers the chromosome of bacteria Small, circular DNA molecules that can exist independently of chromosomes commonly C- found in bacteria D- None of the above
Last Answer : found in bacteria
Description : Which of the following is true for nucleolus ? (1) Larger nucleoli are present in dividing cells. (2) It is a membrane-bound structure. (3) It takes part in spindle formation. (4) It is a site for active ribosomal RNA synthesis.
Last Answer : (4) It is a site for active ribosomal RNA synthesis.
Description : Which of the following statement is correct about membrane cholesterol? (A) The hydroxyl group is located near the centre of the lipid layer (B) Most of the cholesterol is in the form ... forms a rigid, planar Structure (D) The hydrocarbon chain of cholesterol projects into the extracellular fluid
Last Answer : (C) The steroid nucleus form forms a rigid, planar Structure
Description : The structure which helps in the nutrition of the Embryo is (1) Yolk sac (2) Amniotic membrane (3) Crypts (4) Placenta
Last Answer : Yolk sac
Description : Describe the structure of a plant cell. Also draw its Labelle diagram
Last Answer : Cell wall is present. Nucleus lies near the side of cellwall because of large vacuole is present. Single large vacuole is present. Chloroplasts are present. Centrioles are absent.
Description : Describe the structure of a cell?
Last Answer : The structure of a cell, A cell is consists of a cell membrane, Cytoplasm, vacuole and nucleus etc.
Description : Abnormal collagen structure is seen in all of the following except (A) I-cell disease (B) Osteogenesis imperfecta (C) Menke’s disease (D) Ehlers-Danlos sydrome
Description : Which of the following terms is used to describe hemorrhage from the nose? a) Epistaxis Epistaxis is due to rupture of tiny, distended vessels in the mucous membrane of any area of the nose. b ... of a large amount of fluid from the nose. d) Dysphagia Dysphagia refers to difficulties in swallowing.
Last Answer : a) Epistaxis Epistaxis is due to rupture of tiny, distended vessels in the mucous membrane of any area of the nose.
Description : What is the principle behind sterility testing? Describe Membrane filtration method for sterility testing.
Last Answer : Principle: Basic principle of sterility test is that if bacteria or fungi are placed in a medium which provides the nutritive material and water and kept at favourable temperature the organism will grow and their presence can be indicated by the turbidity in the clear medium.
Description : Describe Plasma membrane with reference to Fluid Mosaic model.
Last Answer : Ans: Fluid Mosaic model was proposed by Singer and Nicholson. This model states that plasma membrane is semi-solid. It has bimolecular fluid like lipid zone in which the solid like proteins are ... ). This model best explains the functions of plasma membrane. Hence it is most acceptable model.
Description : In addition to the DNA of nucleus there DNA is (A) Mitochondrian (B) Endoplasmic reticulum (C) Golgi apparatus (D) Plasma 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
Description : All the following statements about TSH are true except (A) It is a tropic hormone (B) It acts on para-follicular cells of thyroid glands (C) Its receptors are membrane-bound (D) Its second messenger is cyclic AMP