Which of the following are not photosynthetic pigments?
A. chlorophylls
B. carotenoids
C. leukophylls
D. phycobilins
E. All of these choices are correct.
Answer: C
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Which of the following statements regarding water flow in vascular plants is false?
A. Water flow through xylem conduits is directly proportional to diameter. B. Flow rate is proportional to the radius of the conduit raised to the fourth power. C. Vessels are much longer and wider than tracheids, thus their rate of water transport is much lower than that of tracheids due to increased resistance. D. The rate at which water moves in plants is a function of the number of conduits and their size. E. Water must cross pits to cross from one cell to another, adding resistance to flow.
Endotoxin is an exogenous pyrogen.
Answer the following statement true (T) or false (F)
Adult stem cells have limited therapeutic potential
A) because they are fully differentiated. B) because they lack a complete set of genes. C) due to their excessive numbers in tissues. D) because their developmental potential is limited to certain tissues.
Entropy means that _________.
A. the quantity of usable energy declines with each transformation B. energy can be neither created nor destroyed C. life should be impossible D. it is not possible to observe an increase in molecular organization