Which of the following is true of eukaryotes but not of prokaryotes they must contain a nucleus they must be multicellular they are always single celled they do not have membrane-bound organelles

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.