Simple diffusion of molecules occurs ________.
a. from an area of lesser concentration to an area of greater concentration
b. in non-living systems as well as living systems
c. across plasma membranes only through transport proteins
Ans: b. in non-living systems as well as living systems
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In 1952, Hershey and Chase confirmed Avery's (1944) conclusion that
A. proteins are the repositories for hereditary information. B. DNA is the repository for hereditary information. C. RNA is the repository for hereditary information. D. each DNA molecule is composed of two strands that are twisted into a double helix. E. the replication of DNA is semiconservative.
Traditionally, the _______ were assigned to the basal group called Parazoa
A. jellyfish B. sponges C. flatworms D. roundworms E. ribbon worm
during swallowing, what covers what
What will be an ideal response?
Answer the following questions true (T) or false (F)
1. Commensalism often results in competitive exclusion. 2. Organisms in communities may be important factors in the evolution/adaptation of other organisms in the community. 3. Climax communities in succession are those that persist for long periods of time.