BIO 1124 EXAM 3 QUESTIONS AND
WELL ELABORATED SOLUTIONS
VERIFIED 100% CORRECT
Exergonic reaction - ANSWER -A spontaneous chemical reaction in
which there is a net release of energy
Endergonic reaction - ANSWER -A non-spontaneous chemical reaction
in which free energy is consumed from the surroundings
Enzyme - ANSWER -Proteins that regulate metabolism and aren't
consumed by the reaction
Active site of enzyme - ANSWER -Specific region of an enzyme that
binds to the substrate
What is the definition of a catalyst? - ANSWER -Chemical agents that
speed up chemical reactions, but are not consumed by the reaction
In what way is an enzyme a catalyst? - ANSWER -They regulate the
rate of metabolism and thus speed up certain chemical reactions
In what way are enzymes very specific in function? - ANSWER -
Enzymes only bind to certain substrates and thus regulate a specific part
of a metabolic pathway
Why are enzymes highly specific? - ANSWER -An enzyme's active
site will only bind to a certain type of substrate
, How many different enzymes are typically found in a cell? - ANSWER
-Thousands of different enzymes
How do metabolic pathways work? (for example, the breakdown of
glucose to pyruvate) - ANSWER -A starting molecule (glucose) is
modified by a certain enzyme; this new product is modified by a
different enzyme; repeats until you get pyruvate
How do anabolic and catabolic pathways differ? - ANSWER -Catabolic
pathways release energy while anabolic pathways consume energy
What are coupled reactions in a metabolic pathway? - ANSWER -
Energy consuming reactions (anabolic) are coupled with energy
releasing reactions (catabolic)
e.x. Breakdown of ATP>ADP (catabolic) coupled with a phosphate
group being attached to glucose (anabolic)
Draw and label the enzyme sucrase and its hydrolysis of sucrose -
ANSWER -
ATP - ANSWER -Adenosine tri-phosphate
Major energy currency in a cell
What are the three main kinds of work that cells perform? - ANSWER -
Chemical work - endergonic reactions that build complex molecules
Transport work - Pumping substances across membranes against their
concentration gradients
Mechanical work - Beating cilia, muscle cell contraction, movement of
chromosomes during cell division
WELL ELABORATED SOLUTIONS
VERIFIED 100% CORRECT
Exergonic reaction - ANSWER -A spontaneous chemical reaction in
which there is a net release of energy
Endergonic reaction - ANSWER -A non-spontaneous chemical reaction
in which free energy is consumed from the surroundings
Enzyme - ANSWER -Proteins that regulate metabolism and aren't
consumed by the reaction
Active site of enzyme - ANSWER -Specific region of an enzyme that
binds to the substrate
What is the definition of a catalyst? - ANSWER -Chemical agents that
speed up chemical reactions, but are not consumed by the reaction
In what way is an enzyme a catalyst? - ANSWER -They regulate the
rate of metabolism and thus speed up certain chemical reactions
In what way are enzymes very specific in function? - ANSWER -
Enzymes only bind to certain substrates and thus regulate a specific part
of a metabolic pathway
Why are enzymes highly specific? - ANSWER -An enzyme's active
site will only bind to a certain type of substrate
, How many different enzymes are typically found in a cell? - ANSWER
-Thousands of different enzymes
How do metabolic pathways work? (for example, the breakdown of
glucose to pyruvate) - ANSWER -A starting molecule (glucose) is
modified by a certain enzyme; this new product is modified by a
different enzyme; repeats until you get pyruvate
How do anabolic and catabolic pathways differ? - ANSWER -Catabolic
pathways release energy while anabolic pathways consume energy
What are coupled reactions in a metabolic pathway? - ANSWER -
Energy consuming reactions (anabolic) are coupled with energy
releasing reactions (catabolic)
e.x. Breakdown of ATP>ADP (catabolic) coupled with a phosphate
group being attached to glucose (anabolic)
Draw and label the enzyme sucrase and its hydrolysis of sucrose -
ANSWER -
ATP - ANSWER -Adenosine tri-phosphate
Major energy currency in a cell
What are the three main kinds of work that cells perform? - ANSWER -
Chemical work - endergonic reactions that build complex molecules
Transport work - Pumping substances across membranes against their
concentration gradients
Mechanical work - Beating cilia, muscle cell contraction, movement of
chromosomes during cell division
