What property of steroid hormones allows them to cross the phospholipid bilayer?
A) Steroid hormones are lipid soluble and easily cross the phospholipid bilayer.
B) Steroid hormones can act in very small concentrations and very few molecules of steroids need to cross the lipid bilayer.
C) Steroid hormones act on cells close to where they were produced and very few molecules are required to travel such a short distance to cross the lipid bilayer.
D) Steroid hormones act on the same cells in which they are produced and, therefore, are within the cell they are acting upon.
A
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What is the difference between Gram-positive and Gram-negative bacteria?
a. Gram-positive bacteria are surrounded by a single membrane, whereas Gram-negative bacteria are surrounded by a double membrane, with an outer membrane that is porous to ions and small molecules. b. Gram-positive bacteria make gramicidin A and Gram-negative bacteria do not. c. Gram-positive bacteria are surrounded by a single membrane, while Gram-negative bacteria have a dual-membrane system with an inner membrane that is porous to small molecules and ions. d. Gram-positive bacteria are motile and Gram-negative bacteria are not.
During S phase, ________ occurs
Fill in the blank(s) with the appropriate word(s).
The arrangement of organisms into groups is best described as ________.
A. identification B. taxonomy C. classification D. systematics
One strategy moths have for evading bats is
a. the ability to become invisible to the bat's echolocation signals. b. straight-line flight patterns. c. a periodic closed-wing free-fall before resuming an erratic flight pattern. d. an erratic flight pattern, but no instances of free-fall. e. flying primarily in the daylight hours.