glucose- glucose molecules allows them to pass through the cell membrane into the cell.
Answer:The helix structure Of DNA helps prevent it from been expose and also the sugar and phoshate group that are important components of nucleotides forms a backbone on the helix structure or the polynucleotide this back bone is hydrophobic i.e water loving hence wouldn't allow for penetration for water.
2. Hydrogen bond is formed between this bases to keep them in place.
Explanation:
The microscope. It allowed for scientists to observe the tiny parts of cells since they are not visible to the naked eye.
The Apple that wheighs more is the one that attracts to the earth more