Cholesterol within membranes functions as a(n) __________ through its interactions with both
hydrophobic and hydrophilic parts of phospholipids.
a. water blocker
b. pH buffer
c. energy source
d. temperature controller
e. fluidity buffer
E
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Identify the structure indicated by #1:
A. uterus B. cervix C. vagina D. ovary E. fallopian tube or oviduct
Where does most photosynthesis occur in the open ocean?
a. the top 10 meters b. below 100 meters c. the top 50 meters d. below 50 meters e. photosynthesis occurs uniformly in the open ocean
The level of carbon dioxide in the blood is monitored by nerve tissue. If you exercise strenuously, the increase in cellular respiration consumes oxygen from the blood and produces surplus carbon dioxide removed in the blood. Since this physical exertion requires faster breathing to replenish oxygen supplies and carry away carbon dioxide, the carbon dioxide sensors result in signals from the brain to increase breathing rate. After you have rested, and carbon dioxide levels are back to normal, your breathing rate decreases too. This is an example of
A. a positive feedback loop that stimulates a response opposite to the stimulus. B. a response to a sensory impulse that causes a muscle or gland to react. C. the dynamic interplay between events that tend to change the internal environment and events that tend to keep it the same. D. a negative feedback loop that stimulates a response similar to the stimulus. E. the dynamic interplay between events that tend to change the internal environment and events that tend to increase the changes.
Understanding the abiotic microenvironment of a community is not very informative when studying the microbial populations in that environment.
Answer the following statement true (T) or false (F)