Question

the a helices in this molecule have several interesting properties. the a helices are arranged in a bundle, forming a tube. the r - groups on the amino acids that point toward the middle of the tube carry full charges or polar groups. the r - groups on the amino acids that point outward from the tube are not polar or charged. which conclusions are supported by this information? select all that apply. the outside of the tube could be inside a phospholipid bilayer membrane. the outside of the tube is likely soluble in water. the inside of the tube is likely to interact with water. the entire molecule is amphipathic.

Explanation:

1. Phospholipid bilayers have non - polar tails in the interior. Since the outside of the tube has non - polar R - groups, it could be inside a phospholipid bilayer.
2. Non - polar substances are not soluble in water and do not interact with water. The outside of the tube has non - polar R - groups, so it is not likely soluble in water or interact with water.
3. The inside of the tube has amino acids with full charges or polar groups, which are hydrophilic and likely to interact with water.
4. The molecule has a non - polar outer part (non - polar R - groups on outside) and a polar/charged inner part (amino acids with charges or polar groups inside), making it amphipathic.

Answer:

The outside of the tube could be inside a phospholipid bilayer membrane.
The inside of the tube is likely to interact with water.
The entire molecule is amphipathic.