What is the process by which cells of a malignant tumor can break away and start new cancers at distant locations?
What will be an ideal response?
metastasis
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Which one of the following is not a way in which RNA differs from DNA?
A. RNA has uracil as one of its bases; DNA has thymine. B. RNAs are typically single-stranded; DNA is double-stranded. C. RNA nucleotides can possess only a single phosphate group; DNA nucleotides have one, two, or three phosphate groups. D. RNA molecules are usually much shorter than DNA molecules. E. The sugar component of RNA nucleotides is ribose; the sugar component of DNA nucleotides is deoxyribose.
Smooth muscle cells in the airways relax while those in the blood vessels contract in response to the hormone epinephrine. What would you expect to be different in these two types of cells exposed to epinephrine?
A. Types of proteins expressed. B. Presence of epinephrine receptors. C. Exposure to epinephrine released by neighboring cells. D. Rate of metabolism. E. Activation of protein kinases.
The structure of the virus in Figure 24-1 that is common to all viruses is:
a. 1.
b. 2.
c. 3.
d. 4.
e. 5.
The ability of living organisms to maintain a constant internal environment despite changes in the external environment is ________
Fill in the blank(s) with correct word