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沒有 【段考】國一社會上學期 權限，請先開通．

沒有 【段考】國一社會上學期 權限，請先開通．

沒有 【段考】國一社會上學期 權限，請先開通．

沒有 【段考】國一社會上學期 權限，請先開通．

沒有 【段考】國一社會上學期 權限，請先開通．

沒有 【段考】國一社會上學期 權限，請先開通．

沒有 【段考】國一社會上學期 權限，請先開通．

1. Which of the following amino acid is branched at β-carbon? (A) Leucine (B) Threonine (C) Serine (D) Phenylalanine (E) Histidine

2. Eric uses a computer software to simulate a 20-residue peptide in different structures. Structure A is an α-helix structure; structure B is a β-strand; structure C is a helix in the collagen structure. The length of these structures should be: (A)C＞B＞A (B) C＞A＞B (C) B＞A＞C (D) A＞B＞C (E) B＞C＞A

3. Five students are discussing carbohydrate. Student A says: Glc(1α B1 )Fru is sucrose. Student B says: An aldohexose has 16 stereoisomers. Student C says: Hyaluronate and heparin are sulfated heteropolysaccharides. Student D says: The α and β anomers of D-glucose can freely interconvert in aqueous solution without breaking any bonds. Student E says: α -GalNAc is added to the side-chain of asparagine in N-linked glycosylation. How many students are correct? (A) 1 (B) 2 (C)3 (D) 4 (E) 5