Which of the following involves positive feedback stimulation?
a. temperature control
b. childbirth
c. glucose concentration
d. absorption of toxins
e. muscle concentration
B
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Discuss permeability in plant cell walls?
What will be an ideal response?
Gel electrophoresis separates the DNA fragments
according to a. their length. b. their mass. c. their speed of travel through the gel. d. the number of nucleotides in the fragment. e. all of these.
Stomach motility
a. decreases following a heavy meal. b. controls the amount of material leaving via the pyloric sphincter. c. is unaffected by emotional state or external environmental factors. d. may be retarded when stretch receptors on the stomach wall are activated. e. is increased by hormones released in response to high stomach acidity.
Substances that can readily pass through the cell membrane are chemically ________ in nature
Fill in the blank with correct word.