The following statements describe how cancer is staged. Which of the statements is true?
A. Most cancers are grouped into stages 1-4; however, treatment options are only available for stages 1-3.
B. Once a cancer reaches each stage, it cannot be reversed, as tumors only grow in size, even with aggressive treatments.
C. Cancer is described based on the size of the tumor, if the tumor has invaded nearby tissues, if it has spread to lymph nodes, and if it has moved to other organs of the body.
D. Cancer is described by ten stages, each with their own subdivisions. The lower the stage, the worse the prognosis.
Answer: C
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Mutations are more likely to occur in repeated DNA sequences because
A) these bases are unstable. B) bases in the strand can form base pairs, generating loops that interfere with replication and repair enzymes. C) the repeats hold onto the replication enzymes, causing base mismatches. D) the repeats attract and bind to mutagens, increasing the mutation rate.
The first stage of carbohydrate metabolism is usually the oxidation of glucose to pyruvic acid known as
A) glycolysis B) cell-lysis C) anabolism D) deamination
________ defenses are not permanently present but, rather, are brought about by the presence or action of predators
Fill in the blank(s) with correct word
What type of animal tissue may be involved in protection, secretion, and absorption?
a. Epithelial tissue b. Muscle c. Adipose d. Connective tissue e. Nervous tissue