Introduction to Biochemistry Q+A Flashcards
Revision
A chemical reaction for which the associated enthalpy change (…) is positive:
a) Cannot occur spontaneously
b) may occur spontaneously if coupled to a reaction in which the enthalpy change is negative and of greater magnitude.
c) Raises the temperature of the surroundings
d) will inevitably occur spontaneously
B
What is a polar molecule?
a) a molecule with no charge
b)
B
How does water arrange itself around ions?
D
Which one of the following statements about amino acids is correct?
a) Amino acids are classified according to the structures and properties of their side chains.
b) Amino acids are unchanged at neutral pH.
c) Amino acids in proteins are mainly in the D-configuration
d) 24 amino acids are commonly used in protein synthesis.
A
All amino acids contain an alpha carbon bonding to the following structures:
a) an amino group
A
Which of the following statements is true about a peptide bond (RCONHR’)?
a) It is non planar
b) It is capable of forming a hydrogen bond
c) Electron resonance between amino and carbonyl groups creates a partial double bond
d) The cis configuration is favoured over the trans configuration
C
Which of the following statements is true about a peptide bond (RCONHR’)?
a) It is non planar
b) It is capable of forming a hydrogen bond
c) Electron resonance between amino and carbonyl groups creates a partial double bond
d) The cis configuration is favoured over the trans configuration
C
Which one is false about metabolism?
a) Catabolic pathways break down reduced substrates for energy generation.
b) Anabolic pathways synthesise oxidised products from small, reduced precursors.
c) Anabolic pathways require the input of energy in the form of ATP.
d) Anabolic pathways require the input of reducing force in the form of NADPH.
e) Catabolic pathways generate reduced cofactors which can drive oxidative phosphorylation.
B
Which on is false about glycolysis?
a) It generates a net gain of 2 ATP molecules per glucose molecule broken down.
b) It forms the first stage of carbohydrate catabolism.
c) It occurs in the mitochondrial matrix.
d) It generates 2 NADH + H+ per glucose molecule broken down.
C
Pyruvate
a) Directly enters oxidative phosphorylation.
b) Is converted to oxaloacetate and is used for fatty acid degranulation.
c) Is converted to acetyl-CoA and then enters the TCA cycle.
C
Which one is false about oxidative phosphorylation?
a) Electrons from NADH and FADH2 are transferred onto O2.
b) The electrons transport chain is located in the inner mitochondrial membrane.
c) Protons are pumped from the intermembrane space for the mitochondrial matrix.
d) Protons flow back across the membrane, following their concentration gradient.
e) Proton flow is coupled to ATP synthesis.
f) Oxidative phosphorylation consists of two separate proton pump systems.
C
