An example of morphological divergence is the wing of a bat and the ____
a. hand of a human
b. foot of a human
c. femur of an elephant
d. femur of a human
e. leg of a chicken
ANSWER: a
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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.
A germfree mouse that is not born by cesarean section is not a suitable animal model for investigating the interaction between a host and one type of bacteria.
Answer the following statement true (T) or false (F)
What process halts the net movement of water from a hypotonic solution into a plant’s cells and often provides the
structural support to many plants? a. plasmolysis b. turgur pressure c. osmotic pressure d. facilitated diffusion e. dynamic equilibrium
The IPAT model can be refined by adding the variable, S = Sensitivity. Which of the following biomes is the most sensitive with regard to shallow acidic soils that destabilize quickly after deforestation?
A. temperate grassland B. tropical rainforest C. temperate deciduous forest D. wetland E. All of the above are characterized by shallow acidic soils.