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1. In humans most cancers are caused byA) UV radiationB) dietary fatC) X-raysD) tobacco2. A DNA microarray is used toA) detect the location of genesB) visualize patterns of gene expressionC) isolate mRNAD) initiate transcription3. In a multicellular organism cells in one area of the body may regulate gene expression in a distant cell by secretion ofA) antibodiesB) hormonesC) repressor moleculesD) RNA polymerases4. Which of the following cells is LEAST differentiated?A) adult stem cellsB) muscle cellsC) nerve cellsD) embryonic stem cells5. The nucleus of an intestinal cell of a tadpole (baby frog) is transferred to an egg whose nucleus has been removed (nuclear transplantation); some of the eggs will develop into normal tadpoles. This demonstratesA) that intestinal cells are not differentiatedB) that frogs have large eggsC) that differentiated cells have retained all of their genetic potentialD) that intestinal cells are embryonic stem cells6. All of the cells in your body have the same complete set of DNA, however, they have different functions becauseA) they contain different chromosomesB) different genes are switched on and off in each type of cellC) they contain different operonsD) they contain different sets of genes7. Regions of noncoding DNA within a gene are calledA) exonsB) oncogenenesC) transcription factorsD) introns8. The tumor-suppressor gene is important in the prevention of cancer because itA) contains multiple promoters for over expressionB) produces gene products that prevent uncontrolled cell growthC) provides protection from cancer-producing virus infectionD) stimulates production of an oncogene9. A genetic defect in humans results in the absence of sweat glands. Some men express this defect all over their bodies but in women it is usually expressed differently. A woman with this defect typically has small patches of skin with sweat glands and other patches without. This pattern of sweat gland distribution can best be explained byA) X chromosome inactivationB) a mutationC) a homeotic geneD) alternative RNA splicing10. The DNA segment that acts as a switch for turning the lac operon off or on is theA) promoterB) regulatory geneC) lactose genesD) operator
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You are asked to determine the number of viable organisms per ml in a sample. The sample is thought to contain between 6.4*10^6 - 8.4*10^6 organisms per ml.
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