A complete turn in the α helix contains ___ amino acids.

Theα helix andβ conformation arethemajorrepetitive ____________ structuresinawidevarietyofproteins,although other repetitivestructuresexistinsomespecializedproteins.

The description of the secondary structure of DNA double helix are correct, EXCEPT

Short regions of α helix are especially abundant in proteins that are embedded in cell __________, such as transport proteins and receptors.

An α helix is generated when a single polypeptide chain turns around itself to form a structurally rigid _______.

在使用螺旋线（Helix）命令创建螺旋线时，需要指定哪些选项？

Which structure is not secondary structure of the protein？（） A: α-helix B: β- fold C: β- Angle D: subunits

Using a right-hand hob with the lead angle ω cuts a left-hand gear with the helix angle β , hob swivel-setting angle δ is: A: ω B: β C: β-ω D: β+ω

DNA secondary structure is a right-handed double helix with a sugar phosphate backbone on the outside and paired bases (A-T, G-C) on the inside. Which of the following are true?

which are the main form of secondary structure of protein ( ) A: supercoil B: β-pleated sheet C: β-turn D: random coil E: double helix