What's not apart of the cell theory? a. all cells have dna surrounded by a nucleus. b. cells are the basic unit of life. c. all things are made out of cells. d. cells come from pre-existing cells.
Bilogy
Bilogy
1 Answer
Feb 12, 2018
a. all cells have DNA surrounded by a nucleus
Explanation:
the three tenets of the theory were:
- all living organisms are composed of one or more cells.
- the cell is the basic unit of structure and organisation in organisms.
- cells arise from pre-existing cells.
these were formed in 1839, while DNA was first isolated in 1869.
it is accepted that cells contain DNA in chromosomes and RNA in the nucleus and cytoplasm, but only in the modern cell theory.
the classical cell theory does not include this.
but using either classical or modern theory, it is false that all cells have DNA surrounded by a nucleus.
though prokaryotes (e.g. bacteria) contain DNA, they lack a nucleus.
it is only in eukaryotes (e.g. animal cells) that the DNA is surrounded by a nucleus.
