2.2.1 PLTW Exam Study Guide.

2.2.1 PLTW Exam Study Guide. A medical imaging technique that uses magnetic fields and radio waves to take pictures of the soft tissues of the body - answerMagnetic Resonance Imaging (MRI) a list of possible diseases or disorders based on medical history, current symptoms, and the results of physical exams, routine testing, and blood work - answerDifferential diagnosis a well-regulated process that occurs when a cell receives the signal to reproduce - answerMitosis Tightly coiled DNA that is found in the nuclei of cells. - answerChromosomes Humans have 46 - answerHow many chromosomes do humans have in each somatic cell Chromosome pairs, one from each parent, having similar gene composition, size, and structure - answerHomologous chromosomes One half of a chromosome. - answerChromatids The centralized region joining two sister chromatids. - answerCentromere A tumor that is not cancerous - answerBenign A cancerous tumor which will grow and spread to invade other tissues or parts of the body - answerMalignant The spread of cancerous cells to other tissues or parts of the body - answerMetastasis A disease caused when cells divide uncontrollably an