Which of the following terms describes the measure of members of a single species in a habitat against all organisms within the same area?
a. community diversity
b. absolute species abundance
c. relative species abundance
d. community richness
c. relative species abundance
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Auxin moves between cells through a process called polar transport. Auxin molecules move from one cell to the next through PIN proteins. However, their movement is unidirectional. What accounts for this unidirectional movement?
A. PIN proteins are only found on the basal side of the cell. B. PIN proteins are only found on the apical side of the cell. C. Auxin diffuses down its concentration gradient. The concentration of auxin molecules decreases as you move down the stem away from the apical meristem. D. Auxin moves independently of its concentration gradient because the presence of the PIN protein provides a channel that auxin can "leak" through to get into adjacent cells. E. Auxin in the unprotonated form can move between cells by going into adjacent spaces occupied by plant cell walls. The movement of auxin is lateral, not unidirectional.
Many species of flowering plants reproduce asexually by __________. Fill in the blank(s) with the appropriate word(s)
Which group of protists are unicellular, biflagellate stramenopiles that forms a significant portion of the
nanoplankton? a. ciliates b. red algae c. golden algae d. foraminifera e. brown algae
PPD (purified protein derivative) or tuberculin is injected intradermally to test whether an individual is infected with tuberculosis. After 48-72 hours post-injection, the test is read by measuring:
A.The intensity of the red coloration of the injection site B. The number of blebs or wheals at the injection site C. The diameter of the bleb or wheal D. The distance the bleb or wheal forms from the injection site