Which one of the following statements about diplomonads and parabasilids is false?
A. Absence of mitochondria in these groups is an ancestral trait.
B. Both groups are flagellated protists.
C. Both groups are in different clades.
D. Some members are parasitic, but some also engage in mutualism.
Answer: A
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Suppose that you have a cell with a membrane that is permeable to water but not to Na+ or Cl? or any
other solute. There is more NaCl outside the cell than inside the cell, and the osmolarity of the cell is higher than that of the solution surrounding the cell. Which of the following should occur?
a. Overall, the cell should lose water. b. Overall, the cell should take up water, Na+, and Cl?. c. Overall, the cell should take up water. d. Overall, the cell should take up water and lose Na+ and Cl?. e. Overall, the cell should lose water and take up Na+ and Cl?.
What homeostatic requirement might explain why discontinuous breathing is only seen in resting insects?
A. Toxic levels of carbon dioxide can build up in active insects. B. Resting insects have more metabolic activity. C. Oxygen can build up in active insects. D. Oxygen is used as quickly as it arrives in active insects. E. Resting insects produce more carbon dioxide.
A mountain rain shadow is the
a. arid area on the windward slope. b. wet area on the windward slope. c. arid area on the leeward slope. d. wet area on the leeward slope. e. arid area on either slope
Polyploidy means having
What will be an ideal response?