Proteins And Enzymes
Which combination of groups is found bonded to the central carbon of every amino acid?
Two amino acids join to form a dipeptide. Which statement correctly describes this reaction?
Which bonds are present in the primary structure of a protein?
Which row correctly matches a level of protein structure to a feature?
A genetic mutation changes a single amino acid in a polypeptide from one with a charged R group to one with a non-polar R group. Which consequence is most likely?
Why is haemoglobin soluble in blood plasma whereas collagen is insoluble in water?
How many oxygen molecules can be transported by one haemoglobin molecule, and why?
Which feature of collagen is most directly responsible for its high tensile strength?
Which statement best explains enzyme specificity?
Which statement describes the induced fit model of enzyme action?
Which statement best describes how enzymes increase the rate of a reaction?
Which pairing correctly identifies an enzyme as intracellular or extracellular?
The temperature of an enzyme-catalysed reaction is increased from 40°C to 60°C, well above the enzyme’s optimum. What happens, and why?
In an experiment with fixed enzyme concentration, the rate of reaction is plotted against substrate concentration. The graph rises steeply then plateaus at $V_{\mathrm{max}}$. What explains the plateau?
Pepsin works optimally at pH 2 in the stomach, while trypsin works optimally at pH 8 in the small intestine. If pepsin were transferred to the small intestine, what would most likely happen?
A student investigating catalase activity with hydrogen peroxide measures the volume of oxygen produced every 10 seconds for 2 minutes. Why must the initial rate be calculated from the steepest part of the curve (first ~30 seconds)?
A student doubles the enzyme concentration in a reaction where substrate is in large excess. What happens to the initial rate, and why?