Two of the nitrogen bases are single ring structures known as

Cells destroy body cells infected by a virus or bacteria.

The response is the basis for vaccination. primary secondary tertiary none of the above

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.