Metabolic Pathways Test Review

Which of the following is true for anabolic pathways?

• they do not depend on enzymes
• they are usually spontaneous chemical reactions
• they consume energy to build polymers from monomers
• They release energy as they degrade polymers to monomers

Tags

NGSS.HS-LS1-6

NGSS.HS-LS1-1

What is an example of anabolism?

• Formation of peptides after protein digestion

• Formation of glucose and fructose from sucrose

• Formation of maltose from two glucose molecules

• Formation of glycerol and fatty acids from triglycerides

Tags

NGSS.HS-LS1-6

The graph shows how the activity of the enzyme varies with the concentration of polysaccharide. What is the reason for the curve levelling off?

• There is insufficient substrate for the enzyme to act on.

• The product acts as an enzyme inhibitor.

• The enzymes have all been consumed in the reaction.

• All the enzyme active sites are occupied by substrate.

Tags

NGSS.HS-LS2-4

Cells can only work if their enzymes are functioning. What can you infer from the graph?

• Cells function best at low pH values

• Cells function fine at all pH values

• Cells function best at high pH values

• Cells do not function well if the pH is too high or too low

The activity of amylase from two bacterial species and a fungus was measured at different pH levels and constant temperature. The results are shown in the graph. Which statement about the effect of pH on amylase can be concluded?

• A. oryzae amylase has the highest optimum pH.

• B. A change in pH affects amylase most in B. licheniformis.

• C. The optimum pH is 6 in B. subtilis.

• D. Amylase activity at pH 8 is the lowest in B. licheniformis.

What is the optimal pH of enzyme A?

• 8
• 2
• 5.7-10
• 10

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6.
  
• The optimum pH of the enzyme is 5.8
  
• The enzyme’s activity increases as pH increases 5.0 to 9.0
  
• The enzyme’s activity is greater around pH of 8.0 .
  

How does temperature affect enzyme-catalyzed reactions?

• Temperature has no effect on enzyme activity.

• Enzyme activity increases indefinitely with temperature.

• Enzyme activity decreases after reaching an optimum temperature.

• Low temperatures permanently denature enzymes.

The graph shows the progress of the same enzyme-controlled reaction at two different temperatures. Which statement is clearly supported by the data?

• The amount of product produced initially occurs at a lower rate at 40 °C

• The optimum temperature for the reaction is 40 °C

• The lower the temperature, the slower the rate of the reaction

• The enzyme is denatured at 40 °C

Tags

NGSS.HS-PS1-5

Enzymes have a specific shape. It will only fit a special _________ in order to begin a chemical reaction.

• substrate

• key

• sugar