Answer:
C
Explanation:
The helix has to unwind before separating. Once it's separated, then new bases can be added. Once the bases are added, the separate strands wind into helices.
Answer:
This is because the cell membrane is a partially permeable membrane, hence allowing the smaller molecules to enter it and larger molecules to be out. For example, protein is too large to enter the cell
Explanation:
<span>the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth </span>
Answer:
Encloses specific structures.
Explanation:
The plasma membrane, also referred to as the cell membrane, has the job of keeping all the cell structures inside the cell protected and enclosed.