Which of these statements best explains why DNA is similar in most living organisms? a. All organisms have the same number of chromosomes
b. All chromosomes have the same number of DNA nucleotide base pairs
c. Al DNA contains the same bases that code of the same amino acids
d. All SNA is passed from one generation to the next during reproduction

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.