biovocabulary..doc

Studying Cells Tutorial Problem 1: The scientific method The activity of the scientific method that sets science apart from many other human endeavors is _________ . D. experimental testing to support or disprove hypotheses Yes, and the concept is nicely illustrated by a quote from Mark Twain, whether medicine is a science or merely an empirical means of earning a living out of the human race. In science, some of our best progress comes when our experiments show that our thoughts or hypotheses are wrong Problem 2: Cell theory Which of the following is not a part of the cell theory? D. Abnormal cells self destruct by apoptosis. Although this statement by itself is true, it is not part of the cell theory. Apoptosis is a mechanism for killing unnecessary or abnormal cells. For example, cells of your immune system are programmed to die after helping to fight disease. The cell theory states: all life is composed of cells, cells are the smallest form of life, and cells only arise from existing cells. Problem 3: Cell sizes What are the respective sizes of a virus and a plant cell? B. 30 nm, 30 μm Viruses range in size from 30 to 80 nanometers (nm), whereas animal and plant cells range from 10,000 to 30,000 nm. 30,000 nanometers converts to 30 μm. Problem 4: Microscopes What type of microscope would allow you to study the orderly sequence of events that lead to the separation of chromosomes during mitosis? (Chromosomes are found inside of the cells nucleus.) B. light microscope The light microscope can look at living tissues, and allow observations of changes over time. An electron microscope, while giving much greater resolution, uses a vacuum and biological materials that are generally not living. know about Mitosis and Meiosis chromatid Each of a pair of identical DNA molecules after DNA replication, joined at the centromere. chromatin Protein/DNA complex making the chromosome. chromosomes Molecules of DNA complexed with specific proteins responsi