Carnivores must be at or above which trophic level?
a. first
b. second
c. third
d. fourth
e. fifth
c
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Vectors often contain a gene conferring drug resistance to their cloning host, in order to detect cells harboring the plasmid.
Answer the following statement true (T) or false (F)
There are 40 individuals in population 1, all of which have genotype A1A1, and there are 25 individuals in population 2, all of genotype A2A2. Assume that these populations are located far from one another and that their environmental conditions are very similar. Based on the information given here, the observed genetic variation is mostly likely an example of
A) genetic drift. B) gene flow. C) disruptive selection. D) discrete variation. E) directional selection.
Cytoplasmic organelles are:
a. absent in prokaryotic cells; present in eukaryotic cells. b. present in both prokaryotic and eukaryotic cells. c. present in prokaryotic cells; absent in eukaryotic cells. d. absent in both prokaryotic and eukaryotic cells.
Most often, the internal environment of a cell has a higher concentration of solutes than is found in the environment outside.
A) True B) False