Biology quiz 4 – Flashcards

A research team began a study of a cultured cell line. Their preliminary observations showed them that the cell line did not exhibit either density-dependent inhibition or anchorage dependence. What could they conclude right away?

Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely

Which of the following is a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active?

The decline of MPF activity at the end of mitosis is due to

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?

Which of the following describe(s) cyclin-dependent kinase (Cdk)?

Which of the following was a discovery that had to be made before human chromosomes could be correctly counted?

After which checkpoint is the cell first committed to continue the cell cycle through M?

Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?

The MPF protein complex turns itself off by

A plant-derived protein known 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?

The cyclin component of MPF is destroyed toward the end of which phase?

Which of the following does not occur during mitosis?

Why do chromosomes coil during mitosis?

Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?

Which of the following is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?

For a chemotherapeutic drug to be useful for treating cancer cells, which of the following is most desirable?

If there are 20 chromatids in a cell, how many centromeres are there?

If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis?

Which of the following is true concerning cancer cells?

Besides the ability of some cancer cells to overproliferate, what else could logically result in a tumor?

What causes the decrease in the amount of cyclin at a specific point in the cell cycle?

Proteins that are involved in the regulation of the cell cycle, and that show fluctuations in concentration during the cell cycle, are called

If cells in the process of dividing are subjected to colchicine, a drug that interferes with the formation of the spindle apparatus, at which stage will mitosis be arrested?

A student is looking through his light microscope (~450 X) at a squashed and stained onion root tip. Some, but not all, of the cells have clearly visible chromosome strands. what does he see?

Density-dependent inhibition is explained by which of the following?

Which of the following most accurately describes a cyclin?

Which of the following describe(s) cyclin-dependent kinase (Cdk)?