For the process of diffusion to occur, molecules must
A. move from areas of low concentration to areas of higher concentration until an equilibrium is reached.
B. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached.
C. remain stationary until their molecular motion allows for an equilibrium to be reached.
D. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached by active transport.
E. move from areas of high concentration to areas of lesser concentration until facilitated transport can assist the molecular equilibrium.
Answer: B
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Bioluminescence is controlled by the gene regulatory mechanism called quorum sensing, wherein the
A) depletion of oxygen is detected by an inducer molecule which activates transcription of the lux operon. B) accumulation of an inducer molecule activates transcription of the lux operon. C) absence of light activates an inducer molecule which activates transcription of the lux operon. D) host tissues produce an autoinducer molecule which activates transcription of the lux operon.
Convert 0.75 g to mg.
A. 75 B. 750 C. 7.5 D. 7500
Which of the following statements about enzymes is FALSE?
The active site of the enzyme is where the chemical reaction takes place. The substrate binds to the enzyme with low specificity. The enzyme undergoes a conformational change that brings substrates closer together in an induced fit. The optimal activity of an enzyme occurs over a narrow temperature range. The optimal activity of an enzyme occurs within a narrow pH range.
In certain plants, some of the roots may be modified to carry out unusual functions. Which of these is not an example of one of these special functions?
A. help absorb oxygen B. store food or water C. parasitize other plants D. carry out photosynthesis E. discourage herbivores