Which number represents the point in the cell cycle during which the chromosomes are replicated?
A) I
B) II
C) III
D) IV
E) V
Answer: B
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The Cell Cycle
- The drug cytochalasin B blocks the function of actin. Which of the following aspects of the cell cycle would be most disrupted by cytochalasin B?
- A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in
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- 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.
- The research team established similar lymphocyte cultures from a number of human donors, including healthy teenagers of both genders, patients already suffering from long-term bacterial infections, and elderly volunteers. They found that the increase in lymphocyte incorporation after pathogen introduction was slightly lower in some of the female teenagers and significantly lower in each of the elderly persons. They repeated the study with a larger number of samples but got the same results.
- Nucleotides can be radiolabeled before they are incorporated into newly forming DNA and can therefore be assayed to track their incorporation. In a set of experiments, a student—faculty research team used labeled T nucleotides and introduced these into the culture of dividing human cells at specific times.
- Several organisms, primarily protists, have what are called intermediate mitotic organization.
- MPF reaches its threshold concentration at the end of this stage.
- At which of the numbered regions would you expect to find cells at metaphase?
- Which number represents DNA synthesis?
- G1 is represented by which numbered part(s) of the cycle?
- If the cell whose nuclear material is shown in Figure 12.2 continues toward completion of mitosis, which of the following events would occur next?
- What is the correct chromosomal condition at the prometaphase of mitosis?
- You have a series of cells, all of which were derived from tumors, and you first need to find out which ones are malignant. What could you do?
- For a chemotherapeutic drug to be useful for treating cancer cells, which of the following is most desirable?
- 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?
- What explains anchorage dependence of animal cells in vitro or in vivo?
- At the M phase checkpoint, the complex allows for what to occur?
- All cell cycle checkpoints are similar in which way?