An ecologist studied the effect of biotic and abiotic factors on a population of bacteria at the bottom of a pond. his study would include all but which levels in the structural hierarchy of life?

Which statement best describes how the nucleus, the rough endoplasmic reticulum, and ribosomes interact during protein synthesis?

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.

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?