When a hormone inhibits its own expression, it is called a ____.
A. hormone stimulant
B. hormone coordinator
C. hormone suppressant
D. negative feedback loop
E. positive feedback loop
Answer: D
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The existence of the Oort cloud cannot be confirmed observationally from Earth because the objects are too small and distant
a. True b. False Indicate whether the statement is true or false
Pseudopodia are used by Amoeba for ingesting food as well as for:a
reproduction. b. excretion. c. digestion. d. movement. e. avoiding predation
Which of the following describes the blood-brain barrier?
A) It is part of the immune system that involves the release of antibodies to protect the brain from infectious agents B) It is a property of the closely packed endothelial cells of the walls of brain capillaries that prevents large molecules from entering the brain C) It is a property of blood vessels of the brain that promotes the diffusion of nutrients into the tissue of the brain D) It is a property of neurons that prevents them from accidentally releasing their neurotransmitters in to the blood circulation
Insulin is a ligand.
a. true b. false