The three types of ocean floor sediments are terrigenous, biogenic, and

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

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.

Which of the following is not a type of epithelial cell