Descriptions of the distal convoluted tubule
a. lined with cuboidal epithelium
b. epithelial cells have many mitochondria
c. connects to the collecting duct
d. all of the above
Answer: d. all of the above
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Once a pathogen has infected the host, ________ is a measure of the pathogen's ability to spread to adjacent or other tissues.
Fill in the blank(s) with the appropriate word(s).
The profundal zone is characterized by:
a. phytoplankton only b. producers and consumers c. plants and animals d. decomposer only e. decomposers and detritivores
The familial form of retinoblastoma is characterized by cancer appearing in both eyes relatively early in life. In contrast, the sporadic form is usually unilateral and appears later. What accounts for the difference?
What will be an ideal response?
A new mutation that arose in one copy of gene X in a somatic cell resulted in the formation of a tumor. Which of the following pieces of evidence best describes how the new mutation directly caused the tumor?
A) Protein X normally stimulates cell division, and the mutation created an overactive version of protein X B) Protein X normally activates a growth hormone receptor, and the mutation decreased the stability of protein X. C) Protein X normally prevents passage through the cell cycle, and the mutation created an overactive version of protein X. D) Protein X normally regulates gene expression, and the mutation created an underactive version of protein X that blocked the cell cycle.