Which structures are unique to chitons?
a. planospiral shells
b. pallium
c. esthetes
d. operculum
c. esthetes
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Which of the following did Watson and Crick already know when they were trying to determine the structure of DNA? The number of _____
A) purines is always larger than the number of pyrimidines B) pyrimidines is always larger than purines C) cytosines is always the same as adenines D) guanines is always the same as thymines E) purines is always the same as pyrimidines
The White Cliffs of Dover, England, are composed of shells of ancient diatoms
Indicate whether the statement is true or false.
Capillary action is one of the forces that aids water's upward movement in plants. The narrower the diameter of the tube, the farther the water column will rise. Capillary action is a result of water molecules:
A. having an adhesive force, which allows them to attach to the vessel walls. B. producing sufficient surface tension to overcome the pull of gravity. C. being associated with hydrophobic molecules, which can result in upward movement. D. storing heat and thus moving faster because of heat of vaporization. E. having a strong cohesive force and attaching to the surrounding vessel walls.
Salt marshes differ from estuaries in that the freshwater input in salt marshes is from a single source.
Answer the following statement true (T) or false (F)