WorksheetsEnzymes and Zwitterions
Total questions: 17
Worksheet time: 4hrs 15mins
Which one of the following statements about Enzymes is incorrect
Enzymes are not consumed in the reaction
Enzymes change shape to accommodate the substrate
Enzymes are catalysts
Enzymes are still active after being cooled
Enzymes are still active after being heated
Which one of the following statements about Enzymes is incorrect
Enzymes lower the activation energy of a reaction
Enzymes increase the number of collisions between the reactants
Enzymes aid bond breaking of the reactants
Enzyme increase the proportion of successful collisions between the reactants
Enzymes are not consumed in the reaction
Which one of the following is not a similarity between the induced fit and lock and key model of enzymes:
Both require the substrate to enter the active site
Both require the substrate to form intermolecular bonds with the functional groups in the active site
Both require the tertiary structure of the enzyme to remain fixed
Both leave the enzyme intact after the reaction
Both models do not apply to denatured enzymes
The substrate refers to
The enzyme
The reactants
The products
The complex
The tertiary and quaternary structures
Alanine (shown here) is chiral. All naturally occurring amino acids are in the L-configuration (none in the D-configuration)
The enzyme that catalyses the condensation of alanine and glycine into a dipeptide:
Will only accept the L-isomer of alanine
Will accept any isomer of alanine
Will accept any amino acid provided that it is L
Will accept both L and D amino acids
It is still unknown what this enzyme will accept
What is not involved in denaturation of a protein?
Exposure to conditions outside it's optimal range
Disruption of the tertiary structure
Disruption of the quaternary structure
Disruption of the secondary structure
Disruption of the primary structure
When a protein denatures
It can be reassembled via condensation reactions
It can be reassembled via hydrolysis reactions
It can be reassembled via amidation reactions
It can be reassembled via enzyme catalysis
It cannot be reassembled
The effects of low temperature on enzymes are:
Reduced function due to disruption of the secondary, tertiary and quaternary structures
Reduced function due to disruption of the primary structure
Reduced function due to insufficient flexibility in the enzyme structure
Increased function due to approaching of optimal conditions
Increased function due to increasing the proportion of successful collisions
The effects of high temperature on enzymes are:
Reduced function due to disruption of the secondary, tertiary and quaternary structures
Reduced function due to disruption of the primary structure
Reduced function due to insufficient flexibility in the enzyme structure
Increased function due to approaching of optimal conditions
Increased function due to increasing the proportion of successful collisions
Which of the following is possible while still maintaining enzyme activity:
Cooling the enzyme, then returning it to its optimal temperature
Heating the enzyme, then returning it to its optimal temperature
The enzyme cannot be taken outside its temperature range with out permanently deactivating it (denaturing)
The enzyme will still be active after both heating or cooling
Which of the functional groups can form ions?
None of the functional groups here
The NH2
The COOH
The CH3
Both the NH2 and COOH
In acidic conditions:
The COOH accepts a proton
The NH2 accepts a proton
The COOH donates a proton
The NH2 donates a proton
The NH2 accepts and the COOH donates a proton, creating a zwitterion
In basic conditions:
The COOH accepts a proton
The NH2 accepts a proton
The COOH donates a proton
The NH2 donates a proton
The NH2 accepts and the COOH donates a proton, creating a zwitterion
This type of structure is called x and is observed at y
A complex, neutral pH
A complex, acidic pH
A complex, basic pH
A zwitterion, acidic pH
A zwitterion, neutral pH
The effects of low pH on enzymes are:
Reduced function due to disruption of the secondary, tertiary and quaternary structures
Reduced function due to disruption of the primary structure
No change in function
Increased function due to approaching of optimal conditions
Reduced function due to deprotonation of the active site
The effects of high pH on enzymes are:
Reduced function due to disruption of the secondary, tertiary and quaternary structures
Reduced function due to disruption of the primary structure
No change in function
Increased function due to approaching of optimal conditions
Reduced function due to protonation of the active site
At low pH, this polypeptide will
Will be protonated on the N atoms
Will be protonated on the OH atoms
Will be deprotonated on the N atoms
Will be deprotonated on the OH atoms
Will not be affected
