Description : The process by which the amount of DNA, RNA and protein can be known at a time is: (a) Cell fractionation (b) Autoradiography (c) Phase-contrast microscopy (d) Tissue culture
Last Answer : Ans. ((b))
Description : Consider the following statement: The ex situ conservation of genetic resources can be done through: (1) Tissue culture practices (2) Maintenance of sanctuaries (3) The establishment of germplasm banks (4) The establishment of national parks
Last Answer : Ans. ((d))
Description : Ribozyme is: (a) enzyme (b) RNA with enzymatic activity (c) Hormone (d) Protein
Description : A variety or strain produced by horticultural or agricultural techniques and not normally found in natural population is called a) Hybrid b) Tissue culture c) GMO d) Cultivar
Last Answer : d) Cultivar
Description : Consider the following statements: (1) Copper is present in cytochrome oxidane (2) Pantothenic acid is precursor of co-enzyme-A (3) Thiamine prohosphate is the prosthetic group in decarboxylases (4) Zinc is present in RNA and DNA polymerases
Description : ? X l74 has: (a) Single stranded DNA (b) Single stranded RNA (c) Double stranded RNA (d) Double stranded DNA
Last Answer : Ans. ((a))
Description : Answer: a, b, c, d Free oxygen radicals are chemical species that are intermediates in the normal process of cellular respiration. Oxidants that are free radicals have been implicated as initiators of ... a. C-reactive protein b. Serum amyloid c. a -Proteinase inhibitor d. Fibrinogen e. Albumin
Last Answer : Answer: a, b, c, d The acute-phase response is a series of homeostatic responses of the organism to tissue injury in infection and inflammation. After an inflammatory stimulus occurs, a number ... 30% to 50% of the level before injury. The reason for the decrease in production is poorly understood
Description : With reference to plant tissue culture select the matching pair: (1) Sterile triploid—banana and seedless fruit (2) Somaclonal variations—differences appearing (3) Embryoids—non-zygatic embryo produced from somatic cells (4) Pulses—belong to cruciferae
Description : Hormone used in tissue culture for better growth is: (1) Auxin (2) Gibberellin (3) Cytokinin (4) Vernalin
Description : Mark the INCORRECT statement about agar, a gelling agent in plant tissue culture medium a. Not digested by plant enzymes b. It does not use in micro-propagation work c. It does not react with media constituents d. Remain stable at incubation temperature
Last Answer : b. It does not use in micro-propagation work
Description : Tissue culture is a good technique to a) Cross two varieties b) Rapidly increase the size of a trees by strengthening the stem c) Eliminate virus d) Improve yield of crops
Last Answer : c) Eliminate virus
Description : 9. Which one of the following is a case of wrong matching ? (1) Callus - Unorganised mass of cells produced in tissue culture (2) Somatic hybridization - Fusion of two diverse cells (3) Vector DNA - Site for t-RNA synthesis (4) Micropropagation - In vitro production of plants in large number
Last Answer : Vector DNA - Site for t-RNA synthesis
Description : An analysis of chromosomal DNA using the Southern hybridization technique does not use (a) electrophoresis (b) blotting (c) autoradiography (d) PCR.
Last Answer : (d) PCR.
Description : An important step in protein synthesis is transcription. Which of the following statement(s) is/are true concerning this process? a. The first step in gene transcription involves separating the double helix ... nucleus to the cytoplasm d. Only one protein can be produced from an initial mRNA strand
Last Answer : Answer: c Transcription of a gene begins at an initiation site associated with a specific DNA sequence, termed a promoter region. After binding to DNA, the RNA polymerase opens up a short ... different proteins from the same gene. mRNA is exported from the nucleus only after processing is complete
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 : Genetic information flows from (A) DNA to DNA (B) DNA to RNA (C) RNA to cellular proteins (D) DNA to cellular proteins
Last Answer : Answer : B
Description : In tissue culture medium, the embryoids formed from pollen grains is due to (a) cellular totipotency (b) organogenesis (c) double fertilization (d) test tube culture.
Last Answer : (a) cellular totipotency
Description : Which of the following parts of the nucleus makes ribosomes and RNA? a. Nuclear envelope b. Nucleolus c. Nucleoplasm d. Chromatin
Last Answer : b. Nucleolus
Description : In the process of transcription, the flow of genetic information is from (A) DNA to DNA (B) DNA to protein (C) RNA to protein (D) DNA to RNA
Last Answer : Answer : D
Description : Translocase is an enzyme required in the process of (A) DNA replication (B) RNA synthesis (C) Initiation of protein synthesis (D) Elongation of peptides
Description : The process of translation is (a) ribosome synthesis (b) protein synthesis (c) DNA synthesis (d) RNA synthesis.
Last Answer : (c) DNA synthesis
Description : The process of translation is (a) ribosome synthesis (b) protein synthesis (c) DNA synthesis (d) RNA synthesis
Last Answer : (b) protein synthesis
Description : The genetic code operates through (A) The protein moiety of DNA (B) Cistrom of DNA (C) Nucleotide sequence of m RNA (D) The anticodons of tRNA
Last Answer : Answer : C
Description : The antiviral action of amantadine is exerted through: A. Interaction with the viral M2 protein B. Interaction with a virus directed thymidine kinase C. Inhibition of a viral protease enzyme D. Inhibition of viral RNA mediated DNA synthesi
Last Answer : A. Interaction with the viral M2 protein
Description : The factor influencing process of flowerings is: (a) Amount of chlorophyll (b) Soil water (c) Soil pH (d) Photoperiod
Description : Haploid plants can be obtained from: (a) Leaf culture (b) Bud culture (c) Root culture (d) Anther culture
Description : To obtain haploid plants, we culture _________ e. Entire anther f. Nucleus g. Embryo h. Apical bud
Last Answer : e. Entire anther
Description : In the secondary culture, cells are obtained from a. primary culture b. the organism c. organ culture d. phenotypic culture
Last Answer : a. primary culture
Description : A major breakthrough in the studies of cells came with the development of electron microscope. This is because (a) the electron microscope is more powerful than the light microscope as it ... (d) electron beam can pass through thick materials, whereas light microscopy requires thin sections.
Last Answer : (b) the resolving power of the electron microscope is much higher than that of the light microscope
Description : What is the structure of sclerenchyma tissue ?
Last Answer : The cells of this tissue are hard , very long and have thick walls. Tissue is protoplasm -free , lignin-containing, and is specifically for mechanical work. Although protoplasm is present in the ... very thick and ligninous. Mature scleroid cells are usually dead. The cell wall is well-contained.
Description : Development of Sporophyte from gametophyte tissue without fusion of gametes is: (a) Apospory (b) Apogamy (c) Apomixis (d) Parthenogenesis
Description : Water potential in leaf tissue is “positive” (near zero) during: (a) Low transpiration (b) Excessive absorption (c) Excessive transpiration (d) Gestation
Description : What tissue present in leaves of Pinus conducts food and water laterally? (a) Transfusion tissue (b) Phloem (c) Xylem (d) Medullary rays
Description : Callus is a. Tissue that forms embryo b. An insoluble carbohydrate c. Tissue that grows to form embryoid d. Unorganized actively dividing mass of cells maintained in cultured
Last Answer : d. Unorganized actively dividing mass of cells maintained in cultured
Description : 82. Closed vascular bundles lack (1) Pith (2) Ground tissue (3) Conjunctive tissue (4) Cambium
Last Answer : Cambium
Description : scattered vascular bundles embedded in the ground tissue with no definite arrangement is found in
Last Answer : scattered vascular bundles embedded in the ground tissue with no definite arrangement is found in – Stem of monocots
Description : The tissue which is involved in development of lateral roots is
Last Answer : The tissue which is involved in development of lateral roots is – Pericycle
Description : Name the living mechanical tissue? What is its function?
Last Answer : Ans: Collenchyma. It helps in providing mechanical strength in aerial parts of dicots. If green, it carries out photosynthesis. Sometimes it is meristematic and gives rise cork cambium in dicot stems at the time of secondary growth.
Description : What is conjunctive tissue?
Last Answer : Ans: The parenchymatous or sclerenchymatous tissue present between the xylem and phloem of radial vascular bundles of roots is called as conjunctive tissue. Due to its presence the vascular bundles are described as separate vascular bundles.
Description : What are hydrophytes? Which type of tissue is responsible for buoyancy in hydrophytes?
Last Answer : Ans: Plants that live in water or water rich soils are called as hydrophytes. The tissue that helps in buoyancy is Aerenchyma.
Description : What is antisense technology? (a) When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene (b) RNA polymerase producing DNA (c) A cell displaying a foreign antigen used for synthesis of antigens (d) Production of somaclonal variants in tissue cultures
Last Answer : (a) When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene
Description : The cell wall of both bacteria and cyanobactena contains: (a) Lipid (b) Pectin (c) Protein (d) muramic acid
Description : DNA is (A) Usually present in tissues as a nucleo protein and cannot be separated from its protein component (B) A long chain polymer in which the internucleotide linkages are of the diester type between C-3 ... linkages are between C-2' and C-5' (D) Hydrolyzed by weal alkali (pH9 to 100°C)
Description : From a DNA-RNA hybrid, DNA can be obtained by addition of (A) DNA B protein and ATP (B) Helicase and ATP (C) DNA topoisomerase I (D) Alkali
Description : Restriction endonucleases recognize and cut a certain sequence of (A) Single stranded DNA (B) Double stranded DNA (C) RNA (D) Protein
Description : Termination of the synthesis of the RNA molecule is signaled by a sequence in the template strand of the DNA molecule, a signal that is recognized by a termination protein, the (A) Rho (ρ) factor (B) σ factor (C) δ factor (D) ε factor
Last Answer : Answer : A
Description : Francis Crick’s seminal concept that in nature genetic information generally flows from DNA to RNA to protein.
Last Answer : Ans. Central Dogma
Description : The most important mechanism by which tetracycline antibiotics exert antiimicrobial action is (a) They chelate Ca2+ ions and alter permeability of bacterial cell membrane (b) They bind to 30S ribosomes ... peptide chain in the bacteria (d) They interfere with DNA mediated RNA synthesis in bacteria
Last Answer : Ans: B
Description : Chromosomes are made up of – (1) DNA (2) Protein (3) DNA and Protein (4) RNA
Last Answer : (3) DNA and Protein Explanation: Each chromosome is made up of DNA tightly coiled many times around proteins called his tones that support its structure.