20 all cells regardless of size share all of the following characteristics except a.) have a cyptoplasm b.) have a nucleus c.) have a plasma membrane d.) have ribosomes

The answer is; B

Cells of lower organisms  (prokaryotic cells) do not have a nucleus.  The genetic material of these organisms loosely floats in the cytoplasm in loops. Even the organelles in the lower organisms are not bound by a plasma membrane. Prokaryote in Greek means ‘before nuclei’.

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint