60 MHR • Unit 1 Metabolic Processes
25.Within the cell, some thermal energy released
from chemical reactions causes convection of
the cytosol. Design a model of a cell and cell
contents to investigate how thermal energy
within the cell affects the rate of enzyme
reactions in the cell.
26.The enzyme lactase breaks down milk sugar
(lactose) into glucose and galactose. Is this
enzyme hydrolytic or oxidative? Use molecular
model kits to demonstrate your choice.
27.Photosynthesis is an endothermic reaction
that is affected by the temperature in the
environment. Develop a testable hypothesis
that explores how temperature affects
photosynthesis.
28.Which process produces more thermal energy,
photosynthesis or respiration? Design an
experiment to explore this question.29.Students studied the effectiveness of an enzyme
at different temperatures by determining the
concentration of product after equal elapsed
times. The data table shows their results.
(a)Make a graph using these values.
(b)Interpret the graph to predict the
concentration of the product at 47°C
and 80°C.
(c)At what temperature does the enzyme
function best? Explain your reasoning.
Temperature (°C) Concentration of product (μg/L)
24
27
30
32
35
36
40
45
50
605
6
8
10
15
18
11
9
4
0
7.How do enzymes affect the rate of biological
reactions?
8.How is an endothermic reaction different from
an exothermic reaction?
9.Energy flows through living things, but matter
is cycled. What does this mean? Explain
briefly.
10.Distinguish between hydrolytic and oxidative
enzymes.
11.What is a thermostable enzyme?
12.How do amino acid R-groups in enzymes affect
chemical reactions?
13.Identify two environmental factors that affect
the ability of a protein to catalyze a reaction.
14.How can an enzyme be regulated with an
inhibitor?15.Metabolic inhibition can reduce the waste
of energy in a cell. Explain how energy is
transformed in a metabolic pathway and how
stopping the process conserves energy.
16.What is a competitive inhibitor?
17.Describe how allosteric regulation controls
enzyme activity.
18.Identify one cofactor and one coenzyme.
19.Describe how snake venom can affect cellular
processes in the human body.
20.How do cofactors and coenzymes contribute to
cell processes?
21.How does a coupled reaction use energy?
22.Why is ATP an effective energy transfer
molecule in the cell?
23.List three uses for ATP in cells.
24.Why does active transport require energy?INQUIRY