Which animal phylum has an asymmetrical body plan?
a. Cnidaria
b. Ctenophora
c. Echinodermata
d. Porifera
e. Annelida
D
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If a cell has a greater concentration of solute than its environment, the cell
A. is isotonic to the environment. B. will not experience a net gain or loss of water. C. will die. D. is hypertonic to the environment. E. is hypotonic to the environment.
Given the following plasmid, what are the sizes of the fragments you would expect from an XhoI digest?
What will be an ideal response?
A seed is often described as "a baby plant in a box with its lunch." Explain this statement using more proper terms for baby plant, box, and lunch.
What will be an ideal response?
Many times species are composed of networks of distinct populations called metapopulations. When do metapopulations occur?
A. When a population in a better habitat does not send out colonizers into less suitable habitats. B. When suitable habitat is patchily distributed and separated by areas of unsuitable habitat. C. When a population is large and uniformly distributed. D. When a population in poor habitat continually sends out dispersers to bolster populations in better habitats.