DNA is found in all the following except:
A. mitochondria of animals.
B. mitochondria of plants.
C. chloroplasts of plants.
E. many eukaryotic viruses.
F. ribosomes of eukaryotes.
E
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What role does Na+/K+-ATPase play in salt excretion by the shark rectal gland?
A) Na+/K+-ATPase pumps sodium out and potassium into cells across the apical membrane. B) Na+/K+-ATPase pumps sodium in and potassium out of cells across the apical membrane. C) Na+/K+-ATPase pumps sodium out and potassium into cells across the basolateral membrane. D) Na+/K+-ATPase pumps sodium into and potassium out of cells across the basolateral membrane.
Air is continuously forced through tubes that thread through vascularized tissue in a pair of inelastic lungs in _____
a. some fish b. amphibians c. birds d. reptiles e. some small mammals
About 75% of the Earth's surface is covered by
A) water. B) bare ground. C) forest. D) grassland.
The normal outcome of mitosis is
A. to make cells smaller. B. to produce genetically identical copies of cells. C. to reduce the amount of DNA in daughter cells. D. differentiation.