A signal transduction pathway is initiated when a _____ binds to a receptor.

-G protein
-signal molecule
-calmodulin
-tyrosine kinase
-cyclic AMP


signal molecule

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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)

Biology & Microbiology

Nervous tissue cells that generate and transmit electrical impulses are called glial cells.

a. true b. false

Biology & Microbiology