[غريبـ فيـ زمنـ عجيبـ]

نموذج 5 بالحل






Question of chapter : Training 1

1.Life is organized in a hierarchical fashion. Which of the following sequences correctly lists that hierarchy as it increases in complexity?

.molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem. ()organ system, ecosystem, population, cell, community, molecule, organ, organism, tissue. ()cell, molecule, organ system, organ, population, tissue, organism, ecosystem, community. ()organism, organ system, tissue, population, organ, community, cell, ecosystem, molecule. ()cell, ecosystem, molecule, tissue, organism, organ system, organ, community




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2.Genetic material is surrounded by a nuclear membrane in ----------------

. ()Bacteria. ()Virus. ()Prokaryotic cells. ()Plant cells. ()cell membrane




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3.A gene is a discrete unit of

. ()lipoproteins. ()polysaccharide. ()DNA. ()Glycoprotein. ()Phosphoglyceride




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4.The --------------- must be testable and falsifiable

. ()theories. ()discovery science. ()hypotheses. ()observations. ()evidence




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5.Radioactive isotopes:

are frequently added to foods as nutritional supplements.. ()can be used to diagnose diseases.. ()have no effect on living tissue.. ()do not occur naturally.. ()are never incorporated into organic compounds.




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6.When water freezes, each molecule forms a stable hydrogen bond with ----- neighbors.

. ()2. ()3. ()4. ()5. ()6




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7.Acid precipitation has bad effects on ________.

. ()coral reef. ()plant life. ()ocean chemistry. ()ecosystem. ()all of the above




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8.Which of the following sentences concerning the carbon skeleton is true?

. Carbon skeletons are all similar in length. ()Carbon skeletons are all branched. ()Carbon skeletons have double bonds only. ()Carbon skeletons may be arranged in rings. ()Carbon skeletons consists of alternative carbon and oxygen atoms




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