During the phases of mitosis, the spindle fibers attach to what structures?

SCIENTIFIC THINKING Each scientist works as part of a broader community of scientists, building on the work of others. Scientific advances often depend on the application of new technologies and/or on new techniques applied to an existing problem. What improvements to existing cloning methods did Wilmut make that allowed him to successfully clone Dolly the sheep from an adult cell?

Red blood cells, which carry oxygen to body tissues, live for only about 120 days. Replacement cells are produced by cell division in bone marrow. How many cell divisions must occur each second in your bone marrow just to replace red blood cells? Here is some information to use in calculating your answer: There are about 5 million red blood cells per cubic millimeter (mm3) of blood. An average adult has about 5 L (5,000 cm3) of blood. (Hint: What is the total number of red blood cells in the body? What fraction of them must be replaced each day if all are replaced in 120 days?)

Which of the following is involved in the process of cell communication?

Which is the structure at the center of the chromosome where the sister chromatids are attached during meiosis?

During which phase of cell division are chromatids found in a cell?

During which phase of mitosis do the spindle fibers disintegrate?

What does the G2 checkpoint in the cell cycle primarily check for?