muscles and fat
enzymes
muscles and fat
protein binds to a particle and uses energy to move through the cell membrane
to build muscle
to build muscle
active transport
A brownie's protein content is entirely dependent on the ingredients used. For example, a brownie recipe that uses a lot of eggs will have more resulting protein.
Protein.
carbohydrates, lipids, and protein
The body does store protein. Muscles are made almost entirely of protein, and when the body has a serious protein shortage, it can obtain protein from its muscles (which shrink accordingly).
It depends on what is meant by "good". Taken protein quality, bio availability and protein amount into consideration I'd say that it's not a good source of protein.
Facilitated diffusion uses proteins to move a molecule across the cell membrane without energy.