Me pls omg me pls! a sample of an unknown liquid has a volume of 30.0 ml and a mass of 6 g. what is its density? show your work or explain how you determined this value. (yes i'm posting again becus no one is answering)

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.