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.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.