举一反三
- Each polypeptide chain consists of a backbone that is adorned with a variety of chemical side chains. This polypeptide backbone is formed from a repeating sequence of the core atoms (_________) found in every amino acid.
- The spatial conformation of a protein mainly depends on A: α-helix and β-sheet B: the sequence of amino acids in polypeptide chain C: disulfide bonds in polypeptide chain D: hydrophobic effects in polypeptide chain E: hydrogen bonds in polypeptide chain
- An α helix is generated when a single polypeptide chain turns around itself to form a structurally rigid _______.
- Which of the following descriptions about β-sheet is correct? A: It belongs to the tertiary structure of proteins B: Two peptide chains can not be anti-parallel C: The side chain of amino acids alternately is located above the peptide unit D: The skeleton of the main chain is zigzag E: There is no hydrogen bond between β-sheet peptide chains
- The euro coins have a common side and a national side.
内容
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Which of the following is the correct procedure of auscultation of lungs? A: Auscultate from the top to the bottom and compare the anterior side with the posterior side. B: Auscultate from the top to the bottom and compare the left side with the right side but avoid heart area. C: Auscultate from the bottom to the top and compare the anterior side with the posterior side. D: Auscultate from left to right and compare the anterior side with the posterior side. E: Random auscultation spots without comparison
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The front side of the house has a(n) _________ arrangement of windows and doors, with the main door in the center, a side door and two windows on each side.
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3.Shirley and Jenny instantly fell into their old routine, wandering the sanctuary side by side. (Para.11)
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The front side of the house has a(n) ________ arrangement of windows and doors, with the main door in the center, a side door and two windows on each side. A: sane B: symmetry C: same D: symmetrical
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The front side of the house has a(n) ____arrangement of windows and doors, with the main door in the center,a side door and two windows on each side. A: vertical B: systematical C: symmetrical D: subjective