Following fertilization of animal eggs, ________ are the second messengers that trigger egg activation
Fill in the blank with correct word.
Answer: calcium ions
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Which transport process requires ATP utilization?
a. active transport b. osmosis c. diffusion d. facilitated diffusion e. diffusion through a channel
Equilibration of pressure between the intrapleural space and the alveoli will lead to which of the following?
A) air moving into the lungs B) restrictive pulmonary disease C) a pneumothorax (the lung will collapse) D) air moving out of the lungs E) chronic obstructive pulmonary disease
A(n) exoskeleton is a characteristic of an echinoderm. Indicate whether the statement is true or false
Ecologists are concerned about amphibian populations because
A. amphibians are very sensitive to environmental change-they may be indicating serious problems. B. their loss would be an aesthetic loss to the planet. C. of the possibility of numerous medicinal uses. D. they are keystone species in many areas-their loss will cause other populations to crash. E. they are increasing to the point of competing with indigenous species.