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Biology grade 12 questions: 11.What kind of selection does a bell shaped curve in a variable indicate? A.    Disruptive selection             C. Divergent selection B.     Unidirectional selection             D. stabilizing selection 12.      In the miller and Urey’s stimulation experiment to study organic molecules formation in primeval atmosphere of the earth, all the following gases were used except which? A.    Ammonia               C. Oxygen B.     Hydrogen              D. Methane 13.The bones in human hands, fippers of the whale and wings of the bats are known as what? ALinker fossils    C. Analogous structures B.     Homologous structures             D. Vestigial structures 14.      According to Lamarck’s theory of evolution, what is the origin of new structures that are necessary for evolution? A. Mutation          C. Natural selection B.Gene recombination         D. Use and disuse of body parts 15.If the DNA of the following animals is hybridized to human DNA, with which one of them would human DNA hybridize more? A.    Horse                   C. Fish B.     Chimpanzee         D. Mice   16.Which alternative best explains speciation A.    Members of a species diverge genetically and produce new species B.It is characterized by minor extinction events C. A process that only results from interspecific hybridization D.  Two different species are able to interbreed in captivity 17. Which of the following is expected to produce new combinations of genes? A. Keeping a male goes and a female sheep in the same room B. Hybridization of a tall variety of “teff” with a short variety C. Vegetative propagation of fruit trees D. Asexual reproduction of unicellular animals 18.Indicate the oldest relative of the modern horses? A. Equus                C. Eohippus B.     Mesohippus    D. Piiohippus 19.To which biological species do Neanderthal humans belong? A. Homo erectus   C. Homo sapiens B. Homo habilis      D. Ardi ramidus Biology EUEE 2005 E.C Grade 11 Unit Two 1.  The main component of the plant cell wall is ___ ? A.  Starch    B. Cellulose      C. protein    D. Chitin 2.  All proteins contain carbon, hydrogen, oxygen and what other element? A.  Chlorine    B. Flourine      C. Nitrogen    D. Sulphur 3.  How many carbon atoms are there in one disaccharide molecule? A.  6      B. 12        C. 18      D. 24 4.  What is the name of the sugar found in milk? A.  Glucose    B. Lactose      C. Maltose  D. Sucrose 5.  What can one conclude about the contents of the foodstuff if a mixture of Benedict solution and a foodstuff remain blue after heating? A.  It contains proteins.          C. It contains fats B.  It lacks starch            D. It lacks reducing sugar 6.  Which of the following groups of substances are all inorganic? A.  Water, sugar, calcium, carbonate        C. Water, calcium carbonate, carbon dioxide B.  Sugar, fatty acid, amino acid        D. Carbon dioxide, amino acid, fatty acid 7.  In which of the following compounds are both members of the pair are polymers of carbohydrates that naturally occur in plants only? A.  Starch and chitin          C. Glycogen and cellulose B.  Starch and cellulose          D. Glycogen and chitin 8.  Which of the following is generally expected to give better health benefits when present in human diet? A.  Animal fat            C. Monounsaturated fatty acid B.  Saturated fatty acid          D. Polyunsaturated fatty acid 9.  Suppose the amino acid coding region in a mRNA is 1200 nucleotides long, how long is the protein in terms of amino acid number? A.  1200 amino acids          C. 400 amino acids B.  600 amino acids          D. 300 amino acids                                                                 

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National Exam የ12ኛ ክፍል ማጠናቀቂያ ሀገር አቀፍ ፈተናን በኦንላይን የሚፈተኑ ተማሪዎች ልምምድ እያደረጉ እንደሚገኙ ይታወቃል። ተማሪዎች እና ወላጆች / መምህራን ሲስተሙን እንዴት አገኛችሁት ? ለዋናው ፈተና ምን አሳሳቢ ጉድለት ተመለከታችሁ ? ምን ጥሩ ነገር ተመለከታችሁ ? በአስተያየት መስጫው አጋሩን። 🌐JOIN : @QesemAcademy |

Bio sensors Biosensores are part of bio technology (bioelectronics ) Living organism (organelles their enzymes are linked with electrodes. The biological reaction converts it in to electrical current Biosensors are used _to measure specific components in beer 🍺 _ To monitor pollutants. _ To detect flavor components in food _to measure concentration of substances. #Application includes _detection of glucose acetic acid glutamic acid 'ethanol biochemical oxgen #Recently biosensors ar also based immunochemical detection These new biosenser will detect Gathogens herbicides toxins proteins DNA #The Other recent biosenser is also based on. Streptavidin ..biotin This approach is use to detect of latoxin Monitoring food quality This outomated unit can detect from to 0.1 50ppb of aflatoxin in a 1.oml Sample in less than 2minutes .

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