What type of molecule can rapidly cross a plasma membrane?
a. large, polar molecules.
b. small, polar molecules.
c. large, hydrophilic molecules.
d. small, hydrophilic molecules.
e. small, hydrophobic molecules.
e
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When pollen from one species lands on the stigma of a flower from another species, the pollen tube typically ____
a. does not develop b. forms, but the sperm cannot penetrate the egg c. forms and grows to the ovary, but then stops d. forms, but the sperm are killed e. forms and the egg is usually fertilized, but the embryo rarely grows
If the 14C to 12C ratio present in a fossil is 25% of that in living organism, how many years have passed since this
fossilized organism died?
a. 1,432 b. 2,865 c. 5,730 d. 11,460 e. 17,190
The primary purpose of homeostasis is to:
a. accept responses to stimuli b. provide unlimited growth within an organism
c. allow unrestricted movement of an organism d. convert an organism to live in a harmful environment e. maintain a constant internal environment
Which of the following is NOT related to inflammation?
A) nonspecific response to pathogens. B) chemotaxis of immune cells toward the site of injury. C) release of cytokines and chemokines. D) increase of vascular permeability. E) none of the above.