Protein + DNAstructure flash cards - Biochemistry MCQs Nov 0.0 / 5 ? BiologyProtein and DNA structureUniversityNone Created by: sophieridgeCreated on: 29-11-17 18:11 What is the pitch of an alpha helix? 0.54nm 1 of 30 How many residues per turn in an alpha helix? 3.6 2 of 30 Degrees each residue rotates in an alpha helix? 100 degrees 3 of 30 The hydrogen bonds are between what number aa in the chain? 1st and 4th 4 of 30 The N-terminus is at the ... of an alpha helix when drawn bottom 5 of 30 What points towards the N-terminus of an alpha helix? N-H in hydrogen bonds 6 of 30 What points towards the C-terminus of an alpha helix? C-O in hydrogen bonds 7 of 30 Residues point.... from the axis of an amino acid away 8 of 30 What is the translation per residue (increase in height per aa)? 0.15nm 9 of 30 What is the conversion between A and nm? 1nm=10A / 1A=0.1nm as A are 10^-10 10 of 30 What is considered the beginning of a polypeptide the N or C-terminus? N-terminus 11 of 30 What isomer of each amino acid is used and what is the rule to differentiate it? L-isome, CORN rule to differentiate from D-isomer 12 of 30 What is the central carbon often called in an amino acid? alpha carbon 13 of 30 What is the N-terminus and C-terminus? NH3+side /COO- side 14 of 30 What form are aa in at physiological pH? zwitterions. 15 of 30 Is the DNA helix parallel or antiparallel? Antiparallel, on strain is 5'-3' the other is 3'-5' 16 of 30 What number are the carbons that make bonds to the nitrogenous base and the two phosphates 1',3',5' 17 of 30 What do purines bind to? Pyrimidines 18 of 30 Are pyrimidines or purines 2 ring structures? Purines are two ring structures. Pyrimidines are one ring structures. 19 of 30 Which nitrogenous bases are purines/pyrimidines? Pyrimidines- Cytosine and Thymine. Purines- Adenine and Guanine 20 of 30 The DNA is a... right handed double helix. 21 of 30 what does a nucleoside consist of? deoxyribose and nitrogenous base. 22 of 30 Structure of phosphodiester bond R-O-P(=O)-O-R. 23 of 30 What is the diameter of the DNA double helix? 2nm 24 of 30 How many bases(nucleotides) per turn? DNA 10 25 of 30 How many nm per turn? DNA 3.4nm 26 of 30 Each base has an angle rotation of? 36 degrees. 27 of 30 Watson and Crick base pairing does not... induce angles - the bases are like rungs of a ladder. Parallel to each other but perpendicular to the phosphodiester backbone 28 of 30 Differentiate the bases Adenine- has no C=0 Thymine has 2 C=0. Guanine has 1 C=0 Cytosine has 1 C=0 29 of 30 How many carbons and hydrogen bonds are there involved in one beta turn? 4 carbons and one hydrogen bond between 1st and 4th aa. 30 of 30
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