Description : Life originated first in the primitive oceans. The evidences supporting this view a. Protoplasm and body fluids of all animals contain salt b. Moist simpler and lower animals are aquatic and marine c. Fossils of earliest animals obtained from rocks of marine origin d. All the above
Last Answer : d. All the above
Description : Who called larger colloidal particles of primitives sea as coacervates :
Last Answer : Who called larger colloidal particles of primitives sea as coacervates : A. Fox B. Oparin C. Empedcles D. Haldane
Description : The correct sequence for the manufacture of molecules/organic compounds on the primitive earth is (a) NH3, nucleic acid, protein and carbohydrate (b) protein, carbohydrate, water and nucleic acid (c) NH3, protein, carbohydrate and nucleic acid (d) NH3, water, nucleic acid and protein.
Last Answer : (d) NH3, water, nucleic acid and protein.
Description : What is nucleic acid ?
Last Answer : Nucleic acid ( Nucleic acid) is the largest , most molecular , molecular-mass and polymer-like chemical in the cell that regulates the various biological functions of the organism.
Description : Limnology is the study of a. Oceans b. Deserts c. Mountains d. Freshwater
Last Answer : a. Oceans
Description : Which does NOT occur in a cell stimulated by a steroid hormone? A) The steroid hormone enters the cell by crossing the plasma membrane. B) The hormone binds to a receptor molecule in the ... activates certain genes. E) DNA is transcribed, mRNA is translated, and the result is protein synthesis.
Last Answer : C) The second messenger cyclic AMP is stimulated by the hormone-receptor complex. D) The hormone-receptor complex binds the chromatin and activates certain genes.
Description : Which of the following statement(s) is/are true concerning translation of the mRNA message to protein synthesis? a. An adaptor molecule, tRNA, recognizes specific nucleic acid bases and unites them ... and the free amino acid occurs in the free cytoplasm d. Complete protein synthesis takes hours
Last Answer : Answer: a, b The synthesis of protein involves conversion from a four-letter nucleotide language to one of 20 chemically distinct amino acids. This process is referred to as ... translation and be moving down the mRNA molecules simultaneously, thus increasing the rate of protein synthesis
Description : The protists have (a) only free nucleic acid aggregates (b) membrane bound nucleoproteins lying embedded in the cytoplasm (c) gene containing nucleoproteins condensed together in loose mass (d) nucleoprotein in direct contact with the rest of the cell substance.
Last Answer : (b) membrane bound nucleoproteins lying embedded in the cytoplasm
Description : Distinguish between protoplasm and cytoplasm? -Biology
Last Answer : answer:
Description : Difference between protoplasm and cytoplasm? -Biology
Description : What is the difference between the cytoplasm and protoplasm? -Biology
Description : The protoplasm b. cytoplasm c. Both d. none
Last Answer : The protoplasm
Description : The basic living substance is ___________. a) protoplasm b)endoplasmic reticulum c)cytoplasm d)mitochondria
Last Answer : a) protoplasm
Description : Cell sap is found inside a. Protoplasm b. Cytoplasm c. Nucleoplasm d. Vacuole
Last Answer : d. Vacuole
Description : Across a membrane phospholipids act as carrier of (A) Organic compounds (B) Inorganic ions (C) Nucleic acids (D) Food materials
Last Answer : Answer : B
Description : Coacervates were formed by a) DNA b) Radiations c) Polymerization d) Polymerisation and aggregation
Last Answer : d) Polymerisation and aggregation
Description : At what stage of mitosis new chromosomes are formed ?
Last Answer : Answer : New chromosomes are formed during the prophase stage of mitosis
Description : Miosis In cell division, how many offspring are formed from one cell ?
Last Answer : In meiosis cell division, 4 offspring cells are formed from one cell.
Description : At what stage of mitosis is the spindle device formed ?
Last Answer : Answer : The spindle instrument is formed in the pro-metaphase stage of mitosis.
Description : How many offspring cells are formed from three mother cells in mitosis division ?
Last Answer : In mitosis division, 3 offspring cells are formed from three mother cells.
Description : What is the separation of colloidal particles from those of molecular dimensions called?
Last Answer : Dialysis
Description : Assertion Colloidal sols scatter light while true solutions do not. Reason The particles in the colloidal sol move slower than that of the true solutions. -Chemistry
Last Answer : Both assertion and reason are true but the reason is not the correct explanation of assertion. The size of colloidal particles is large enough to scatter light while particles of a true solution are too small to scatter light.
Description : Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do? -Maths 9th
Last Answer : The colloidal particles are smaller and not heavy. They always remain in a state of zig-zag motion, called Brownian movement, which counters the force of gravity acting on colloidal particles and ... particles of suspension are larger, heavy and have less movement, thus settle down due to gravity.
Description : Aerosol is a system of colloidal particles having a size of
Last Answer : Aerosol is a system of colloidal particles having a size of A. `5mum` B. `1-2 mum` C. less than `100 mum` D. more than `10 mum`
Description : Assertion :- Filtration of colloidal particles is not possible by filter paper. Reason :- Size of colloidal particle is less than filter paper pores.
Last Answer : Assertion :- Filtration of colloidal particles is not possible by filter paper. Reason :- Size of ... D. If both Assertion & Reason are False.
Description : Choose the correct reason(s) for the stability of the lyophobic colloidal particles.
Last Answer : Choose the correct reason(s) for the stability of the lyophobic colloidal particles. A. ... layer of opposite charges around the colloidal particles.
Description : Which of the following represents macromolecular colloidal particles?
Last Answer : Which of the following represents macromolecular colloidal particles? A. Solution of gold B. Cellulose C. Soaps D. Synthetic detergents
Description : size of colloidal particles may range from:
Last Answer : size of colloidal particles may range from: A. 1 to 1000 nm B. 10 to 100 pm C. 1 to 100 `mum` D. 1 to 10 mm
Description : The size of colloidal particles lies between :
Last Answer : The size of colloidal particles lies between : a. 10-10m and 10-9m b. 10-9m and 10-6m c. 10-6m and 10-4m d. 10-5m and 10-2m
Description : Ultra centrifuges are used for the separation of __________ solid particles. (A) Coarse (B) Fine (C) Colloidal (D) Dissolved
Last Answer : (C) Colloidal
Description : A sol is prepared by addition to excess AgNO3 solution in KI solution. What charge is likely to develop on the colloidal particles ?
Last Answer : Ans. Positive.
Description : If an electric field is applied to a colloidal sol, the dispersed phase particles are found to move towards the electrode of opposite charge. If however, the dispersed phase is made stationary, the ... move in the opposite direction. What is the term used for such movement of dispersion medium ?
Last Answer : Ans. Electro osmosis.
Description : Proteins can exist in the cell in the forms of a. Colloidal particles b. crystalloid c. Both d. none
Last Answer : Colloidal particles
Description : Suspended colloidal particles in water can be removed by the process of
Last Answer : Coagulation
Description : Suspended colloidal particles in the water can be removed by the process of?
Description : Which of the following refers to the scattering of light by colloidal particles? w) Rutherford effect x) Tyndall effect (pron: tin-dahl) y) Thompson effect z) none of these
Last Answer : ANSWER: X -- TYNDALL EFFECT
Description : Assertion: Coacervates are believed to be precursors of life. Reason: Coacervates were self duplicating aggregates of proteins surrounded by lipid mol
Last Answer : Assertion: Coacervates are believed to be precursors of life. Reason: Coacervates were self duplicating ... both the assertion and reason are false.
Description : Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin o
Last Answer : Which one of the following is incorrect about the characteristics of protobionts ( ... separate combinations of moelcules from the surroundings
Description : Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life? (a) They were partially isolated from ... were able to reproduce. (d) They could separate combinations of molecules from the surroundings.
Last Answer : (c) They were able to reproduce
Description : Coacervates were experimentally produced by a) Oparin and Haldane b) Darwin c) Aristotle d) Louis Pasture
Last Answer : a) Oparin and Haldane
Description : Coenzymes are (A) Heat stable, dialyzable, non protein organic molecules (B) Soluble, colloidal, protein molecules (C) Structural analogue of enzymes (D) Different forms of enzymes
Last Answer : Answer : A
Description : All statements regarding 3-OH-3 methyl glutaryl CoA are true except (A) It is formed in the cytoplasm (B) Required in ketogenesis (C) Involved in synthesis of Fatty acid (D) An intermediate in cholesterol biosynthesis
Description : The Kyoto Protocol is for a. limiting Green house gases b. Ozone depleting substance c. Reducing acid rain d. None of the above
Last Answer : a. limiting Green house gases
Description : Reverse of Glycolysis is _________________. a. Glycogenolysis. b. Citric Acid Cycle. c. Gluconeogenesis. d. Uronic Acid Pathway
Last Answer : c. Gluconeogenesis.
Description : Which one of the following structural formulae of two organic compounds is correctly identified along with its related function? (a) B : Adenine - A nucleotide that makes up nucleic acids (b) A : Triglyceride - ... ) B : Uracil - A component of DNA (d) A : Lecithin - A component of cell membrane
Last Answer : (d) A : Lecithin - A component of cell membrane
Description : Consider the following statements: 1. The atmosphere of the primitive earth was reducing 2. The primary source of energy for the chemosynthetic reactions on earth that led to the origin of life was the solar energy 3. Liquid water did not ... 1 and 2 (b) 1 and 4 (c) 1, 2, and 3 (d) 1, 3, and 4
Last Answer : Ans:(d)
Description : 6. In 1953 S L Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from pre existing non living organic molecules. The ... -reducing atmosphere. d) High temperature, volcanic storms, reducing atmosphere and contains NH3 and CH4
Last Answer : d) High temperature, volcanic storms, reducing atmosphere and contains NH3 and CH4
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