举一反三
- The region of a protein that associates with a ligand, known as its binding site, usually consists of a _____ in the protein surface formed by a particular arrangement of amino acid side chains.
- A compound consists of atoms ______ different chemical properties. A: of B: by C: for D: with
- Database marketing is ideal when a company does not have direct contact with its customers。（ ）
- The spatial arrangement of atoms in a protein or any part of a protein is called its __________________. A: fold B: conformation C: configuration D: formation
- The cooling water is in direct contact with the outer surface of the liner as a result of which it is termed a （）.
内容
- 0
the complementary effect of food protein refers to A: Provide enough calories，can save food protein intake B: Provide a variety of vitamins, can save food protein intake C: Adequate supply of essential fatty acids can improve the nutritional value of protein D: Eating a mix of different types of protein has a higher nutritional value than eating one alone
- 1
What is the most appropriate definition of conformation? A: The chemical formula of a molecule B: The fixed arrangement of atoms dictated by the bonds of a molecule C: The three dimensional structure a molecule is most likely to adopt, given its chemical formula D: The (potentially flexible) spatial arrangement of atoms around fixed bonds in a molecule
- 2
A doorman is the first and last hotel employee that the guests have direct contact with.
- 3
A chemical compound that contains two atoms of oxygen and one atom of another chemical element is called ______
- 4
We can learn from the passage that________. A: as far as energy source is concerned, salt water is useless because of its chemical properties B: the working principle of an vibrating water column is to use water as a direct power driving a generator C: Britain is pursuing a method that the Japanese have already put into practice D: Britain is the most advanced country in developing new energy source