Which of the three different representations of protein structure is most useful for studying the interior shapes formed by the folds of the protein?
three models of a protein structure.
the first (from left to right) structure is a space-filling model. here, each atom is represented by a ball of specific color.
the second structure is a ribbon model. here, the sequence looks like a ribbon twisted or coiled to match the shape of the protein.
the third structure is a backbone model. here, the sequence is represented as a thread.

The second structure, the ribbon model of protein structure is most useful for studying the interior shapes formed by the folds of protein.

Explanation:

The ribbon model of protein structure is the representation of structure of protein in 3D schematic diagram where colour coding for the different secondary structures can be done for better understanding.

In this model side chain is not shown. Generally, this model of structure is used for the comparison of overall structure of two different proteins.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

the answer is cell division : )