What affects the rate of diffusion of solutes?
I.
Concentration gradient
II.
Temperature
III.
Molecular size
A. I only
B. II only
C. I and II
D. II and III
E. I, II, and III
Answer: E
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Which of these statements is true of the energy in an open system containing living organisms?
a. The system will quickly settle into equilibrium. b. This system will generate a net surplus of energy. c. There must be a net influx of energy to this system. d. Energy transfers cannot be tracked in open systems.
Which immunoglobulin class/es can fix complement?
A. IgG only B. IgE and IgA C. IgD only D. IgM and IgG E. IgM only
Which cellular structure is correctly matched to the role it plays within the cell?
a. chloroplast?storage of enzymes b. lysosome?powerhouse of the cell c. centrosome?cell division d. plastids?structural support of the cell e. Golgi complex?production of energy
The term "organic soup" refers to the ancient oceans before life formed, in which organic molecules such as amino acids accumulated.
a. true b. false