Answer:
C. Nucleic Acids arranged in a double helix.
Explanation:
The structure of DNA is best described as a double helix. DNA has a sugar phosphate back and nucleotides connected by covalent bonds. Together, it looks like a twisted ladder which is also known the double helix.
It seems that you have missed the given option for this question but anyway, here is the answer. The statement that would not be a valid reason for a cell's need to have these control molecules present is that <span>they make it impossible for the cell cycle to occur out of order. Hope this is the answer that you are looking for. </span>
Answer:
all of them apply
Explanation:
In my opinion all of them apply (except the 4th one). Ecosystems can be small, big, have living and non-living parts and they are made of biomes. Not only can ecosystems vary in size, but they can also differ in just about every imaginable biotic or abiotic feature.
There are 23 pairs chromosomes in the human cell.