primary secondary
There are no known proteins such as helix proteins. Alpha helix is a secondary structure element found in proteins that formed by amino acids which can form helix. Other secondary structures are beta sheets and random coils.
When non polar residues are situated near the helix termini, they are often exposed to solvent. Proteins will compensate for this problem by helix capping. This is simply the provision of H-bond partners for the otherwise bare N-H and C=O groups. Folding places the hydrophobic regions inside the protein.
All of them. Tertiary is the overall 3D shape of the protein Quaternary is what proteins it is attached to and how Primary is the actual order of the amino-acids which make up the chain Secondary is the way that that chain coils or folds So 'helix' refers to the coiling of the chain. Hence it is the secondary structure.
Protein is a chemical family name. Its shape may be helical. But a helical shape is of a spring type item shape.
In proteins, the alpha helix predominantly twists in a right-handed direction.
In the DNA. The term "double helix" refers to the structure of DNA.
the double helix refers to the SHAPE OF A DNA MOLECULE!!! It isn't that hard of a connection to make.
Double Helix
The helix or coil structure in biology refers to the coiling of a protein or nucleic acid molecule into a three-dimensional shape. For example, alpha helices are a common secondary structure found in proteins where the polypeptide chain forms a tight helical structure. This coiled shape is important for the function and stability of many biomolecules.
In the DNA. The term "double helix" refers to the structure of DNA.
The phrasing is a little odd, but I suspect the term you're looking for is "alpha helix". Other "twisting spiral shapes" are possible, for example the 3.10 helix and the pi helix, but the alpha helix is the most common and most familiar.
Some parts of a protein can have a helical structure - one of the most common secondary structures in proteins is the alpha helix.However, helix - especially double helix - will probably be more often used in the description of DNA, so be careful not to mistake the two.