MCB63X Principles of Biochemistry Exam Questions and Answers

MCB63X Principles of Biochemistry Exam Questions and Answers A carbon has its electrons stably distributed into sp3 orbitals. How many different atoms does it likely bond to? - Correct Answer️️ -4 A carbon has its electrons stably distributed into sp2 orbitals and one pi orbital. How many different atoms does it likely bond to? - Correct Answer️️ -3 A carbon has its electrons stably distributed into an sp orbital and two pi orbitals. How many different atoms does it likely bond to? - Correct Answer️️ -2 Most electronegative atoms (in order from least to greatest)? - Correct Answer️️ -N O F What is a molecular conformation? - Correct Answer️️ -The (potentially flexible) spatial arrangement of atoms around fixed bonds in a molecule What is molecular configuration? - Correct Answer️️ -The fixed arrangement of atoms dictated by the bonds of a molecule. What is the metabolic term that describes the synthesis of complex bio-molecules from building blocks? - Correct Answer️️ -anabolism What is the metabolic term that describes the breakdown of complex bio-molecules to simple building blocks? - Correct Answer️️ -catabolism What is the term for a living organism that extracts energy from sunlight? - Correct Answer️️ -Phototroph What is the term for a living organism that extracts energy from chemical molecules? - Correct Answer️️ -Chemotroph What are the two major classifications for organisms based on how they obtain carbon? - Correct Answer️️ -Autotroph and heterotroph How to autotrophs obtain carbon? - Correct Answer️️ -Fixing CO₂ How to heterotrophs obtain carbon? - Correct Answer️️ -Eating food Formula for change in Gibbs free energy - Correct Answer️️ -∆G = ∆H - T∆S At equilibrium what is ∆G? - Correct Answer️️ -0 When ∆G is negative? - Correct Answer️️ -Forward reaction is spontaneous When ∆G is positive? - Correct Answer️️ -Forward reaction is nonspontaneous (backwards reaction is spontaneous) Relationship between ∆G° and ∆G? - Correct Answer️️ -∆G = ∆G° + RTln(Q) Relationship between ∆G° and k? - Correct Answer️️ -∆G° = -RTln(k) Structure of amino acid? - Correct Answer️️ -Has alpha carbon, carboxyl group, and amino group What is physiological pH? - Correct Answer️️ -7.4 Structure of amino acid at physiological pH? - Correct Answer️️ -Amino