aboker prep. biology grade - 12 enterance exam.2000-2009ec

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aboker prep. biology grade - 12 enterance exam.2000-2009ec unit – 1 1. if an hiv patient takes a drug that inhibits the function of the viral reverse transcriptase enzyme, which of the following processes would be primarily affected? a. energy of the virus into the patient’s cells c. copying if rna into dna b. copying if dna into rna d. protein synthesis 2. some countries demand foreign travelers to produce hiv-free certificate before letting them enter the country. what do we call this type of disease control mechanism? a. legislative b. physical c. cultural d. biological 3. which one of the following statements is correct about hiv? a. it is a bacteriophage c. it is a dna virus b. it is a retrovirus d. it infects plants and animals alike 4. identify from the following a biological control method of malaria? a. use of fishes to feed on mosquito larvae …

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ion c. biosensors for testing blood glucose level b. dna finger printing technology d. protein production from single cells 12. among the following human diseases, identify the one that is transmitted through a vector? a. leprosy b. chancroid c. gonorrhoea d. leishmaniasis 13. a number of viruses, including hiv, have more than one strain. this shoes that viruses are? a. capable of living outside their hosts c. capable of mutation b. capable of reproduction d. obligate parasites 14. which of the following are rod-shaped bacteria? a. cocci b. spirochaetes c. spirilla d. bacilli 15. what are bacteriophages? a. bacteria b. viruses c. protozoa d. fungi 16. which one of the following is the major killer of aids patients? a. pneumonia c. anemia b. opportunistic infection d. malnutrition 17. among the following infectious human diseases, identify the one that is caused by a virus? a. yellow fever b. pneumonia c. cholera …

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d. their enzymes do not denture at the temperature 23. choose the disease that is caused by what is known as the “droplet infection”? a. flu b. aids c. cholera d. malaria 24. which of the following is the best collective name for all bacteria with spherical shapes? a. cocci b. bacilli c. spirochaetes d. streptococci 25. in which part of the cell do gram-positive and gram-negative bacteria differ regarding their staining property with gram’s stain? a. cytoplasm b. cell membrane c. cell wall d. nucleus 26. to which of the following groups does hiv belong? a. plasmids b. retroviruses c. dna viruses d. bacteriophages 27. what are the individual strands of a fungal mycelium called? a. fungus b. spores c. hyphae d. hydra 28. what is the main mode of transmission of diseases such as cholera and typhoid fever? a. sexual intercourse c. blood-to-blood contact. b. bites of animal …

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to the ecosystem 35. to which of the following groups do those bacteriophages that integrate their dna into the chromosome of their bacterial host belong? a. virulent viruses c. lysogenic viruses b. lytic viruses d. non-parasitic viruses 36. which group of micro-organisms causes the disease known as athlete’s foot? a. bacteria b. fungi c. protozoa d. viruses 37. under which of the following groups can the fungi be more conveniently placed? a. autotrophs b. heterotrophs c. prokaryotes d. plants 38. what is the advantage of using haart (highly active anti-retroviral therapy) for the treatment of hiv? a. it gives a lasting immunity to hiv. c. it prevents re-infection by hiv. b. it prevents mutation of hiv. d. it helps to break the life cycle of hiv. 39. on which one of the following principles are most of the anti-hiv drugs currently in use working? a. inhibition of enzyme action c. …

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own as integrase- inhibitor? a. conversion of viral rna to dna b. replication of the viral genome c. insertion of the viral genome into host genome d. release of the viral progeny from the cell 46. from which organism is the first antibiotic used in medicine produced? a. gram negative bacteria c. genetically modified protozoa b. members of the fungi d. higher plants 47. what does the absence of chloroplasts in a unicellular organism indicate? a. reproduction by sexual means c. heterotrophic nutrition b. autotrophic nutrition d. complete lack of metabolic processes 48. . which colour do gram positive bacteria stain with gram stain? a. red b. purple c. pink d. white 49. among the following organisms , which one belongs to the prokaryotes? a. paramacium b. streptococcus c. spirogyra d. tapeworm 50. which of the following features makes human t-lymphocyte cells more vulnerable to hiv attack? presence of ; …

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aboker prep. biology grade - 12 enterance exam.2000-2009ec unit – 1 1. if an hiv patient takes a drug that inhibits the function of the viral reverse transcriptase enzyme, which of the following processes would be primarily affected? a. energy of the virus into the patient’s cells c. copying if rna into dna b. copying if dna into rna d. protein synthesis 2. some countries demand foreign travelers to produce hiv-free certificate before letting them enter the country. what do we call this type of disease control mechanism? a. legislative b. physical c. cultural d. biological 3. which one of the following statements is correct about hiv? a. it is a bacteriophage c. it is a dna virus b. it …

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