Which of the following statements best describes the actions of thyroid hormones?
A. Thyroid hormones bind to epithelial plasma membranes that line the intestine.
B. These hormones interact with membrane signaling proteins.
C. Thyroid hormones bind to molecules of the cytoskeleton in the cell cytoplasm.
D. Both "These hormones interact with membrane signaling proteins" and "Thyroid hormones bind to epithelial plasma membranes that line the intestine" are correct.
Answer: B
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1. The periosteum is a tissue that serves only to protect the bone because it is not supplied with nerves or blood vessels. 2. Short, irregular, and flat bones have large marrow cavities in order to keep the weight of the bones light. 3. The structural unit of compact bone (osteon) resembles the growth rings of a tree trunk. 4. The term osteoid refers to the organic part of the matrix of compact bones. 5. Sixty-five percent of the mass of bone is a compound called hydroxyapatite.
In liquid XYZ, you notice that light is scattered as it passes through. There is no precipitant in the bottom of the beaker, though it has been sitting for several days. What type of liquid is this?
A) solution B) suspension C) colloid D) mixture
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Indicate whether the statement is true or false
The most toxic of our metabolic wastes are nitrogenous wastes.
Answer the following statement true (T) or false (F)