During the light reactions of photosynthesis, which of these does not occur?
A) Sunlight excites electrons in chlorophyll, allowing an electron acceptor up the energy hill to accept them.
B) Water is used to regenerate the electrons in the chlorophyll that were excited by sunlight.
C) Sunlight excites electrons in chlorophyll, which eventually wind up on NADPH.
D) Sunlight excites electrons in chlorophyll, which are transferred directly to ATP.
Answer: D
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Because of hydrogen bonding, water is uniquely suited for its central role in life. Many hydrophilic molecules interact freely with water, but there are a number of hydrophobic molecules important for life, too
How does the interaction between water and hydrophobic molecules help to organize biological systems? A. Because cells are not pure water (they have many substances dissolved within them), the hydrophilic/hydrophobic effect has little role in biological organization. B. The ionic bonds between water cause hydrophobic molecules to associate with one another and not with water molecules. C. Because water molecules preferentially associate with one another, they force hydrophobic molecules to associate with one another and not with water molecules. D. None of the above
____ is the net movement of molecules or ions from a low concentration to a higher concentration
a. active transport b. facilitated diffusion c. exocytosis d. osmosis e. diffusion
Which of the following statements about ecological pyramids is true?
A. A pyramid of organism numbers will always have a large base and a small top. B. The limited number of trophic levels in an ecological pyramid is due to increasing complexity and size of organisms at each greater trophic level. C. Pyramids built upon the biomass of organisms at each level eliminate size as a factor. D. Energy gains between trophic levels occur based upon biomass conversion. E. None of the choices are true.
Which one of the following dissolves blood clots?
a) Streptokinase b) Streptolysin c) Hyaluronidase d) Deoxyribonuclease