What two substances make the backbone of the DNAmolecule?

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these

The (blank) states that all loving things are made of cells.

Which of the following would most directly interfere with sperm production? ingestion of a substance that mimicked inhibin interruption of sustentocytes' production of abp low sperm count use of synthetic steroids (testosterone)