Biology Chapter 12
A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. How many picograms would be found at the end of S and the end of G2?
16:16
Cyclin-dependent kinase (Cdk) is _____.
An enzyme that attaches phosphate groups to other proteins.
During _____ the cell grows and replicates both its organelles and its chromosomes.
Interphase.
In some organisms, such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What would result from this?
Large cells containing many nuclei.
During _____ both the contents of the nucleus and the cytoplasm are divided.
The mitotic phase.
Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol disrupts microtubule formation. Surprisingly, this stops mitosis. Specifically, Taxol must affect _____.
The structure of the mitotic spindle.
Why is it difficult to observe individual chromosomes with a light microscope during interphase?
They have uncoiled to form long, thin strands.
