A signal transduction pathway is initiated when a _____ binds to a receptor.
-G protein
-signal molecule
-calmodulin
-tyrosine kinase
-cyclic AMP
signal molecule
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Match the following items with the correct phrases.
_______1. _______________ are chemotrophs that use inorganic chemicals as their energy source. _______2. Organisms that use organic compounds as their source of carbon are called ____________________. _______3. Organisms that use organic compounds as their energy source are called ____________________. _______4. Organisms that use carbon dioxide as their source of carbon are called ____________________. _______5. Organisms that use light as their energy source are called ____________________. a. autotrophs b. heterotrophs c. lithotrophs d. organotrophs e. phototrophs
The corpus luteum secretes some ____ and a lot of ____ which readies the uterus for pregnancy
a. luteinizing hormone; follicle stimulating hormone b. follicle stimulating hormone; luteinizing hormone c. GnRH; progesterone d. estrogen; progesterone e. progesterone; estrogen
Inflammatory responses are orchestrated by the immune system and are part of the body's third line of defense.
Answer the following statement true (T) or false (F)
Nervous tissue cells that generate and transmit electrical impulses are called glial cells.
a. true b. false