Which variable is not a density-dependent factor?
A. a red-tailed hawk preying upon a population of field mice
B. competition between two male deer for territory
C. an early cold spell that causes the plants in a given area to die off earlier than normal
D. smallpox outbreaks during the 1800s
Answer: C
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The domains of life arose as barriers between gene exchange evolved between organisms
Indicate whether the statement is true or false.
All of the following describe facilitated diffusion EXCEPT ____
a. it is specific b. it is dependent on a concentration gradient c. it requires ATP d. it can involve either carrier proteins or channel proteins e. it involves integral proteins
Experimenters replaced the statoliths in a crayfish statocyst with iron filings and then held a magnet above the animal. Based on your knowledge of the function of statoliths, what would they observe?
A. The crayfish stayed upright. B. The crayfish attempted to escape by rapidly swimming backwards. C. The crayfish turned upside down. D. The crayfish lay on its side. E. None of the answers are correct.
Explain why the steroid hormone estradiol (MW 272) readily crosses membranes by simple diffusion but the much smaller H+ requires transport proteins
What will be an ideal response?