The structural building blocks for proteins are ____
a. enzymes
b. amino acids
c. cholesterol
d. polysaccharides
e. vitamins
ANSWER: b
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In humans and other mammals, X inactivation takes place:
A. early in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. B. late in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. C. throughout the lifetime of an organismâ€"with each new cell division, both X chromosomes are activated, and one is then inactivated in each new cell. D. early in development, with all maternal X chromosomes being inactivated and cells maintaining active copies of only the paternal X chromosome. E. early in development, with all paternal X chromosomes being inactivated and cells maintaining active copies of only the maternal X chromosome.
Estrogen is a lipid soluble hormone that can easily cross membranes. Knowing this, what can be concluded about estrogen receptors?
A. The receptors would be coupled to a G-protein. B. The receptors would be linked to enzymes that triggered a kinase cascade. C. The receptors would be found inside the cell. D. The receptors would be on the plasma membrane. E. The receptors would also be lipid soluble and able to cross membranes.
Which of the following is false?
Chapter 28 Plant Tissues 293 a. Periderm is a primary tissue. b. There is no tissue in animals that corresponds to meristem tissue of plants. c. Growth from cell division at the tips of stems and roots produces primary growth. d. Divisions of the lateral meristem increase the diameter of the roots and stems. e. Lateral meristem activity produces secondary growth.
Which of the following mineralocorticoid is responsible for regulating blood volume and pressure?
A. T4 B. T3 C. calcitonin D. aldosterone E. cortisol