Helicobacter pylori has been associated with:a
emphysema.
b. duodenal ulcers.
c. peptic ulcers.
d. lung cancer.
e. skin infections.
C
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The following graph represents the concentration of cyclins over the course of the cell cycle. Which of the following statements is TRUE regarding the phase of the cell cycle where the green arrow is pointing?
A. At this point in the cell cycle, the cell has determined that the DNA is intact and environmental conditions are favorable for DNA replication.
B. At this point in the cell cycle, chromosomes have properly aligned on the metaphase plate and are beginning to separate.
C. At this point in the cell cycle, DNA has already been replicated correctly and the cell is preparing for mitosis.
D. At this point in the cycle the cell is determining if environmental conditions are favorable for growth and proliferation.
E. At this point in the cycle the cell is continuing to grow and make abundant tubulin proteins.
An oncologist (a physician who specializes in cancer) compares two biopsy samples by looking at the percentage of cells in mitosis. Sample 1 has 15% of cells in mitosis, and sample 2 has 8% of cells in mitosis
These samples are of the same tissue type. Which sample is likely to be cancerous, and why? Why is it important that the two samples being compared came from the same tissue type?
What were the two different types of australopithecines?
A. erect, knuckle-walker B. hunting, gathering C. gracile, robust D. arboreal, terrestrial E. carnivorous, omnivorous
__________ is a process that _________ genetic variability, and ___________ is a process that ____________ genetic variability.
Fill in the blank(s) with the appropriate word(s).