Steroid hormones ____
a. are proteins
b. include testosterone, estrogens, and cortisol
c. never activate second messengers
d. never alter membrane transport of ions
e. are large nonpolar molecules
ANSWER: b
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A tumor is actively producing both VEGF and FGF, factors associated with angiogenesis. However, no network of blood vessels to the tumor has been established in spite of the fact that blood vessels are nearby. This observation most likely suggests that
A) the VEGF and FGF are not functional. B) angiogenesis inhibitors are in greater concentration. C) only one of the molecules is active, not both. D) angiostatin is not produced by the cancer cells. E) the tumor is metastatic.
Which of the following statements is
INCORRECT?
a. There are differences in the quality of energy. b. Once energy is utilized, it is not seen in any other form. c. Whenever energy conversion occurs, some energy is lost. d. One form of energy can be converted to other forms of energy. e. The universe has a definite amount of energy.
Protozoa in freshwater systems
What will be an ideal response?
The total protein content of the cell is called the ________
Fill in the blank with correct word.