Dna replication occurs
a. so that a cell can grow.
b. so that the cell can divide.
c. so that proteins can be made.
d. so that mutations can be removed.

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones. because of this, we would expect osteoblasts to contain numerous a) nuclei. b) ribosomes. c) lysosomes. d) golgi bodies.

La glucosa es el nutriente mas utilizado por las celulas en la respiracion celular en esta ocurre 4 fenomenos cuales son