Adenine pairs with uracil
guanine pairs with cytosine
Simple Diffusion Across the Cell (Plasma) Membrane. The structure of the lipid bi-layer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.
Answer: Rocks are abiotic
Explanation: They arnt alive so how can it be biotic?
A cell wall. Animal cells do not have a cell wall have plants have a cell wall.
In biotechnology, the process of introducing the foreing DNA into a cell by a virus is called transduction.Gene therapy is one of the purposes of this process.
