During which step of water purification does water moves through sand beds and activated charcoal?
A. Storage
B. Sedimentation
C. Aeration and settling
D. Chlorination
E. Filtration
Answer: E
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Osmotic pressure is a function of the difference in the concentration of ____ on the two sides of the membrane
Fill in the blank with the appropriate word.
Which of the following statements is NOT true of lophophorates?
A. Their tentacles serve both in respiration and in feeding. B. They have a U-shaped digestive tract. C. They have a true coelom. D. There are three phyla of them: Phoronida, Bryozoa, Brachiopoda. E. They are parthenogenetic.
Lignin is an important component in
A) tight junctions. B) plant cell walls. C) fungal cell walls. D) plasmodesmata. E) bacterial cell walls.
Four of the following are key characteristics for the survival of a species. Which one is the exception?
A. Ability to acquire energy and nutrients B. Response to environmental change C. Reproduction D. Inability to change E. Ability to grow and adapt through changes in DNA