If a scientist observes an enzyme polypeptide chain arranged in spiral turns that rise upward and are held in place by hydrogen bonds he/she is looking at a tertiary structural arrangement.
Answer:
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
Answer:
Osmosis
Explanation:
Passive transport does not require energy for movement in and out of a place or across a membrane e.g a cell.
Osmosis uses passive transport to move materials in and out of a cell by setting up concentration gradient through a distance.
Osmosis can be defined as the movement of molecules or particles of a solution from an area of higher concentration to that of lower concentration through a semi-permeable membrane e.g plasma membrane. As we can see, the difference in concentration is the drive for the transport between the two medium. When the concentration is the same, there won't be any movement again.
