front 1 The centromere is a region in which... | back 1 chromatids remain attached to one another until anaphase. |
front 2 Why do neurons and some other specialized cells divide infrequently? | back 2 They have been shunted into G0. |
front 3 Which of the following is released by platelets in the vicinity of an injury? | back 3 PDGF |
front 4 Several organisms, primarily protists, have what are called intermediate mitotic organization. What is the most probable hypothesis about these intermediate forms of cell division? | back 4 They show some but not all of the evolutionary steps toward complete mitosis. |
front 5 Using which of the following techniques would enable your lab group to distinguish between a cell in G2 and a cell from the same organism in G1? | back 5 Radioactive-labeled nucleotides |
front 6 Proteins that are involved in the regulation of the cell cycle, and that show fluctuations in concentration during the cell cycle are called... | back 6 cyclins |
front 7 A plant-derived protein know as colchicine can be used to poison cells by blocking the formation of the spindle. Which of the following would result if colchicine is added to a sample of cells in G2? | back 7 The chromosomes would coil and shorten but have no spindle to which to attach |
front 8 Several organisms, primarily protists, have what are called intermediate mitotic organization. These protists are intermediate in what sense? | back 8 They maintain a nuclear envelope during division. |
front 9 Suppose a biologist can separate one of a dozen pieces of chromatin from a eukaryotic (animal) nucleus. It might consist of which of the following? | back 9 Two long strands of DNA plus proteins. |
front 10 Which of the following investigations might be most productive to show what the data on the teenagers might indicate? | back 10 Test female teens at different times in their menstrual cycles. |