The plasma membrane serves many functions, many of which depend on the presence of specialized membrane proteins. Which of the following roles of the plasma membrane could still occur if the bilayer were lacking these proteins?
(a) intercellular communication
(b) selective permeability
(c) cellular movement
(d) import/export of molecules
(b)
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All animals gain or lose heat by a combination of four general mechanisms
Indicate whether the statement is true or false.
A drug that inhibits the Y5 receptor has been shown to
a. have an effect on body weight in normal rats. b. have an effect on body weight in obese rats. c. have an effect on food intake in normal rats. d. have an effect on food intake in obese rats. e. have no effect on food intake or body weight in any rats.
Amphibians evolved directly from what ancestral organisms?
a. reptiles b. shelled invertebrates c. fishes d. soft-bodied animals e. marine invertebrates
What is the relationship between the narrow-sense heritability (h2 ) index and the impact of selection?
What will be an ideal response?