concerning the nucleus of human cells, which of the following is true? a.all human cell have nuclei b.all nuclei have a double nuclear membrane  c.the chromosomes in nuclei are composed of dna and  rna  d.the nucleus controls most cellular activities  e.chromosomes direct structural protein construction inside the nucleus

13. The process of "cell drinking" is called: a. phagocytosis b. exocytosis c. pinocytosis d. digestion 14. The fibers and proteoglycans that form the Extracellular Matrix (ECM) connect with: a. vesicles formed by the plasma membrane b. integral proteins of the plasma membrane and the cytoskeleton c. integral proteins and phospholipid of the plasma membrane d. directly to the cytoskeleton of the cell 15. Which of the following is a passive process? a. exocytosis b. osmosis c. active transport d. phagocytosis 16. Which of the following will move easily through the plasma membrane of the cell? a. protein b. starch c. glycogen d. oxygen

19. The Table below compares the cell features of various plant and animal cells. follow the examples given. XXX= "Present"

What structure cannot be found in ALL cells? Explain why    A. Mitochondria   B. DNA    C. Cell membrane   D. Cytoplasm   F. Ribosomes