Which organisms obtain energy by oxidizing organic or inorganic substances?
a. auxotrophs
b. autotrophs
c. chemotrophs
d. phototrophs
Ans: c. chemotrophs
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What is the energy source for facilitated diffusion?
a. ATP hydrolysis b. concentration gradients c. glucose metabolism d. GTP hydrolysis e. lipid phosphorylation
Amniotes differ from amphibians by
a. their size. b. possession of lungs. c. internal fertilization. d. laying of eggs. e. being tetrapods
Which of the following indicates when the tree was likely suffering drought stress?
1.The close location of two cycles of early wood shown in A.
2.The lack of xylem vessels in C.
3.The large vessels in the xylem shown in B.
4.The two series of xylem vessels close together shown in D.
Many proto-oncogenes regulate ________
A) cell growth B) cell cloning C) cell division D) cell repair