Think you’ve got your head wrapped around Energy Flow and Enzymes? Put your knowledge to
the test. Good luck — the Stickman is counting on you!
Q. Which of the following statements best describes the second law of thermodynamics?
Energy is neither created nor destroyed.
The universe is always heading toward an ordered state.
The entropy of a system is always decreasing.
The entropy of the universe is always increasing.
There is a constant amount of heat in the world.
Q. Which of the following is a good definition for all anabolic pathways?
The processes that generate nucleic acids from DNA
The processes that generate smaller, less complex biological building blocks from larger, more complex ones
The processes that generate ATP
The processes that generate larger, more complex biological compounds from smaller, less complex ones
The processes that generate DNA from nucleic acids
Q. Enzymes
take part in lowering the activation energy for a reaction.
are not consumed during the reaction.
are not modified in the course of a reaction.
speed up the rate of the reaction.
do all of the above.
Q. Which of the following is NOT an important indicator of how fast a reaction will proceed?
The presence of an enzyme
The concentration of reactants
The fact that ΔG is very negative
The temperature of the reaction
The concentration of products
Q. Equilibrium can best be described as when
the forward and reverse reactions are occurring at the same rate.
an enzyme is present.
the ΔG value is very negative.
the reactants are all used up.
lots of product has been made so the reaction can’t occur anymore.
Q. Which of the following is NOT a function of catabolic pathways?
To generate energy in order to produce larger biological molecules
To generate small biological molecules that can be used to make larger biological molecules
To produce large biological molecules
Both options 1 and 2
Options 1, 2, and 3
Q. Where are the hydrophobic regions of a protein most likely found?
On the outside of the protein
Deep inside the protein
Close to the aqueous environment of the cell
Only in hydrophobic proteins
No amino acids are hydrophobic, and so there are no hydrophobic regions.
Q. What is the term that describes how an enzyme and substrate wander around the aqueous environment of a cell in search of each other?
Diffusion
Activation energy matching
Active site searching
Meandering
Importing
Q. According to the first law of thermodynamics, the change in energy in a system must be either
positive or zero.
negative or zero.
zero or less than zero.
positive or negative, but never zero.
positive, negative, or zero.
Q. The food we eat is digested with the help of
the enzymes encoded in our DNA.
enzymes provided by microbes in our guts.
no other organisms. The food is never broken down.
special proteins called ribozymes.
our DNA.