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

调控蛋白的DNA结合区不包括（ ）。 A: Proline-rich区 B: Helix-turn- helix C: Zinc finger D: Leucine zipper

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

which are the main form of secondary structure of protein( ) A: Supercoil B: β-pleated sheet <br/>C . β-turn C: random coil D: double helix

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

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

The news ______ to be a mistake. A: turn over B: turn on C: turn off D: turn out

Changes in the policy will, ____, affect your daily life. A: on turn B: by turn C: with turn D: in turn

【单选题】The party ___ to be very successful. A. turn out B. turn on C. turn up D. turn into

_______ the TV now, and go to sleep. A: Turn on B: Turn down C: Turn off D: Turn up