What is the physical barrier in the root that regulates the flow of water to xylem via cell walls?
A) phloem
B) epidermis
C) Casparian strip
D) cortex
Answer: C
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Anthrax is an emerging disease for which there is no treatment or vaccine available
Indicate whether the statement is true or false.
An artificial vesicle composed of a lipid bilayer is mixed with several peripheral membrane proteins and analyzed by freeze-fracture electron microscopy. What will be seen in the resulting image?
A. bumps will be visible on both layers B. bumps will be visible only in the extracellular face (E face) C. bumps will be visible in the protoplasmic face (P face) D. No bumps will be visible in either face
The interaction of frequent fire and recurrent drought combine to maintain both forest and prairie under identical climatic conditions in the midwestern United States.
a. true b. false
You discover a new organism while on vacation in Yellowstone Park. You use a series of experiments to establish that it carries out aerobic respiration, but find that it has a unique ATP synthase that requires 16 protons per rotation. What does this tell you about the P/O ratio in this organism?
A. The new organism only makes ATP by substrate-level phosphorylation. B. The P/O ratio in the new organism is higher than your P/O ratio. C. The P/O ratio in the new organism is lower than your P/O ratio. D. The P/O ratio in the new organism is the same as your P/O ratio.