The fluid nature of the membranes is attributed to a lateral movement of
A. pumps such as the proton pump.
B. phospholipid molecules.
C. the entire lipid bilayer.
D. antigen molecules.
E. protein channels.
Answer: B
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Indicate whether this statement is true or false.
The brown tree snake in Guam had a of about 100 snakes per hectare, which is approximately equal to two American football fields.
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What is the best explanation for why the arthropods, such as insects, spiders, and crabs, were the first animals to move onto land?
a. The majority of early arthropods did not have to have a moist environment for their survival. b. They possessed primitive lungs. c. They had stout, fleshy fins that allowed them to crawl on land. d. By chance, they already possessed structures suited to life on land so the transition was easier. e. When they moved to land, they encountered no predators.
Phloem transport of sucrose is often described as going from source to sink. Which of the following would not normally function as a sink?
A) growing leaf B) growing root C) storage organ in summer D) mature leaf E) shoot tip