What do g protein coupled receptors and steroid hormone receptors have in common (circle one)? a) they are enzymes. b) they act through g-proteins. c) they result in production of diffusible second messengers. d) they bind ligand specifically and reversibly via noncovalent interactionse) they bind hydrophobic ligands.

c) They result in production of diffusible second messengers.

Explanation:

In G protein coupled receptors and steroid hormone receptors, when a ligand binds to these receptors, it activates one or more signal transduction systems, which initiate different cascades of events that alter the concentration of intracellular second messengers which stimulates other cascade of reactions.

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white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.