The biological theory of aging known as the theory suggests that cells can divide a maximum number of about 75 to 80 times and that cells become less capable of dividing as people age.

You are given an electron micrograph of a bacterial cell. in the micrograph you can clearly see three thin layers of different densities surrounding the cell. based on the micrograph, you can infer that this cell is and would appear after application of the gram stain procedure. gram-negative / pink gram-positive / purple gram-positive / pink gram-negative / purple