Which of the following metabolic system descriptions is mismatched?
A. Linear - the product of enzyme A becomes the substrate for enzyme B
B. Cyclic - the starting molecule is regenerated to initiate another turn
C. Convergent - a linear pathway branches into two or more alternative processes
D. Divergent - one or more branches deviate from a linear path
Answer: C
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What is an ENSO event and what conditions contribute to its occurrence? What effect does an ENSO
event have on the global environment, and how does it manage to have such far-reaching impacts? What will be an ideal response?
A student poses the question: How does the presence of dissolved salt affect the freezing point of water? To answer this question, the student set up two conditions. In the first condition, the student added salt to water in a container and referred to this condition as the variable. In the second condition, the student did not add any salt to water in a second container and referred to this condition as the control. The student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. Would this be a valid experiment?
A. Yes, because there is more than one variable. B. No because there is only one variable and a control C. No, because there is not more than one variable D. Yes, because there is one variable and a control
Which of the following factors is believed to limit the size of most bacterial cells?
A. the ability to acquire oxygen for cell respiration B. the availability of carbon in the environment C. the availability of nitrogen in the environment D. the fact that nutrients must enter the cells by simple diffusion
Sodium ions are single atoms. Why can't they simply diffuse through the cell membrane's lipid bilayer?
A. Chelator proteins capture any ions that start to cross the bilayer. B. Since they are charged, ions can't cross the hydrophobic center of the membrane without a channel or pump. C. Ions do traverse the membrane easily, but the sodium-potassium pump moves them back across. D. Sodium ions are covalently attached in groups of three, which are too large to diffuse easily.