Even though cellular macromolecules contain a large number of carbon and hydrogen atoms, they are not all spontaneously converted into CO2 and H2O
This absence of spontaneous combustion is due to the fact that biological molecules are relatively __________ and an input of energy is required to reach lower energy states.
(a) large
(b) polar
(c) stable
(d) unstable
(c)
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Oxidation-reduction reactions
A. remove electrons from both molecules involved. B. remove protons from one molecule and join them to another molecule. C. never occur at the same time. D. remove electrons from one molecule and add them to another molecule simultaneously. E. remove oxygen from the cell.
Four of the five conditions below are related by their
abnormal numbers of chromosomes. Select the exception. a. monosomy b. aneuploidy c. nondisjunction d. complete chromosome set e. trisomy
Why are most weight-loss programs typically ineffective?
What will be an ideal response?
Labeling.The following statements refer to the accompanying figure showing the fine structure of a leaf
Figure 27.12A
A. Epidermis is labeled ____. B. Cells rich in chlorophyll and thus the main sites of photosynthesis are in layers labeled ____. C. The spongy mesophyll is labeled ____.