Liver cells, mammary cells, and skin cells all contain the same genome; however, their respective proteomes vary drastically. This observation is best explained by what phenomenon?
A. gene splicing
B. cell division
C. cell differentiation
D. crossing over
E. evolution
C. cell differentiation
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How are steroid hormone receptors and cell-surface receptors similar?
A. When bound to their ligand, both types enter the nucleus to activate transcription. B. Both types cause GDP to be exchanged for GTP in a G protein. C. Both types undergo a conformational change when they bind to their ligand. D. When activated the signals of both types are transduced across the plasma membrane.
The tissue found in the center of a root is ____
a. xylem b. endodermis c. cortex
d. phloem e. pith
Which of the following components of the lung secretes a lubricating substance that allows the lung tissues to separate when inflated?
A. Bronchial tube B. Capillary endothelium C. Basement membranes D. Respiratory membrane E. Alveolar epithelium
Sodium chloride broth is selective.
A) True B) False