In a water molecule, a) the oxygen atom is more electronegative than the hydrogen atoms.

b) unequal sharing of electrons results in a polar molecule

c) the oxygen atom has an overall negative charge with the hydrogen atoms having an overall positive charge

d) all the choices are correct

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.

Which organisms udergo photosynthesis