The polymerase chain reaction (PCR) uses ________
and a heat-resistant DNA polymerase to rapidly
increase the number of molecules of a DNA
fragment. Fill in the blank(s) with the appropriate word(s).
Answer: primers
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Enzymes aid in metabolism by ____
a. changing the DG of the reaction b. adding additional reactants to the system c. slowing the rate of some reactions and increasing the rate of other reactions d. stabilizing the transition state e. removing unused reactants from the system
The vitreous body is located between the cornea and the lens
____________________ Indicate whether the statement is true or false.
The diffusion of water across a plasma membrane is referred to as
A. osmosis. B. facilitated diffusion. C. bulk flow. D. active transport. E. countercurrent flow.
Plants maintain higher levels of phytochrome at their growing tips where phytochrome plays important roles in growth responses to light. Phytochrome levels are also high in areas of the plant that are "greening". What does this suggest about the role of phytochrome in these "greening" zones?
A. Phytochrome is facilitating the transcription and translation of photosynthesis related proteins. B. In these areas, phytochrome is the first step in the electron transport chain of photosynthesis. C. Phytochrome is absorbing green wavelengths of light. D. Phytochrome is facilitating the migration of chlorophyll pigments from other areas of the plant.