Sebastian wants to make ball-and-stick models of the four macromolecules. he has colored balls for each of the elements in these molecules, including the following. red: hydrogen black: carbon purple: oxygen green: nitrogen for a model of which macromolecule will he need mostly black and red balls? a carbohydrates b lipids c nucleic acids d proteins

The red balls here refers to the hydrogen and black balls refers to carbon. This means that we need a macro molecule which is made up of carbon and hydrogen only.

The macro molecule that has more number of carbon and hydrogen is lipid. it has a very small proportion of oxygen in it and is mostly made up of glycerol molecules with three fatty acid molecules.

This only contains carbon and hydrogen.

the supermassive black hole is in the middle of the galaxy.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products