EXPH 386 Exam 1 Questions and Answers Fully Solved Latest Version 2025-2026
One calorie is defines as the amount of heat requires to raise ______ kg of water by ______
degrees celcius - Answers1
1
The sun transfers its energy to a car and subsequently warms it. The term that describes this
process is - Answersheat
this term describes how hot or cold an object is - Answerstemperature
The energy yield from food is in part determined by the efficiency of digestion -
Answerscoefficient of digestibility
Why do lipids contain more energy that carbs or proteins? - Answerslipids are more energy
dense because they have more hydrogen atoms that can be oxidized
energy relates to the ability to do _____ - Answerswork
the first law of thermodynamics is the.. - Answersconservation of energy
An object is dropped from the top of the building. Once the object is released and is halfway
from the ground, the object has ... - Answerskinetic energy only???
when a lipid molecule is broken down, energy is subsequently released. This is an example of an
- Answersexergonic reaction
T OR F
the second law of thermodynamics states that the transfer of potential energy in any
spontaneous process always proceeds in a direction that increases the capacity to perform
work. - Answersfalse
Two examples of energy conversion: - Answers-photosynthesis (captures energy that we utilize
as food and oxygen)
- cellular respiration (energy released becomes conserved in compounds used for biological
processes)
T OR F
enzymes are consumed during a reaction - Answersfalse
How do enzymes increase the rate of the forward and reverse reactions? - Answersthey
accelerate the forward and reverse rates of chemical reactions within the body WITHOUT being
consumed or changed in the reaction (therefore enzymes have a slow turnover rate and can be
reused)
, Reaction rates depend on what three factors? - Answers-PH
-temp
- availability of substrates
Pyruvate gains two hydrogens and thus forms lactate. This reaction is known as _______
reaction.
With this example, pyruvate is being ______ - Answers-reduction
-oxidized
What are the three types of biological work in humans? Examples? - Answers1.mechanical-
muscle action
2. chemical- synthesizes cellular molecules such as glycogen, protein
3. transport- concentration substrates such as Na+ and K+ ions in intra and extracellular fluids
What is the purpose of a buffer? - Answersa chemical or physiological mechanism that prevents
changes in the H+ concentration and therefore PH
Involves any process in which the atoms in an element gain electrons, with a corresponding
decrease in valence - Answersreduction reaction
refers to the substance being reduced - Answersoxidizing agent
any substance that ionizes in solution to give off H+ - Answersacid
oxidation and reduction reactions that take place together - Answersredox reaction
the term that refers to gain of electrons - Answersreduction
refers to the substance being oxidized - Answersreducing agent
reactions that transfer oxygen, hydrogen atoms or electrons. (a loss of electrons, with a
corresponding gain in valency) - Answersoxidation reaction
Any substance that forms hydroxide ions (OH-) in a water solution. - AnswersBase
the term that refers to the loss of electrons - Answersoxidation
What is the mechanism involved in hydrolysis and what is an example of hydrolysis? -
Answersthe H+ and OH- from water are used to split chemical bonds; digestion
T OR F
the farther a reaction is from equilibrium, the more energy it can release - Answerstrue
One calorie is defines as the amount of heat requires to raise ______ kg of water by ______
degrees celcius - Answers1
1
The sun transfers its energy to a car and subsequently warms it. The term that describes this
process is - Answersheat
this term describes how hot or cold an object is - Answerstemperature
The energy yield from food is in part determined by the efficiency of digestion -
Answerscoefficient of digestibility
Why do lipids contain more energy that carbs or proteins? - Answerslipids are more energy
dense because they have more hydrogen atoms that can be oxidized
energy relates to the ability to do _____ - Answerswork
the first law of thermodynamics is the.. - Answersconservation of energy
An object is dropped from the top of the building. Once the object is released and is halfway
from the ground, the object has ... - Answerskinetic energy only???
when a lipid molecule is broken down, energy is subsequently released. This is an example of an
- Answersexergonic reaction
T OR F
the second law of thermodynamics states that the transfer of potential energy in any
spontaneous process always proceeds in a direction that increases the capacity to perform
work. - Answersfalse
Two examples of energy conversion: - Answers-photosynthesis (captures energy that we utilize
as food and oxygen)
- cellular respiration (energy released becomes conserved in compounds used for biological
processes)
T OR F
enzymes are consumed during a reaction - Answersfalse
How do enzymes increase the rate of the forward and reverse reactions? - Answersthey
accelerate the forward and reverse rates of chemical reactions within the body WITHOUT being
consumed or changed in the reaction (therefore enzymes have a slow turnover rate and can be
reused)
, Reaction rates depend on what three factors? - Answers-PH
-temp
- availability of substrates
Pyruvate gains two hydrogens and thus forms lactate. This reaction is known as _______
reaction.
With this example, pyruvate is being ______ - Answers-reduction
-oxidized
What are the three types of biological work in humans? Examples? - Answers1.mechanical-
muscle action
2. chemical- synthesizes cellular molecules such as glycogen, protein
3. transport- concentration substrates such as Na+ and K+ ions in intra and extracellular fluids
What is the purpose of a buffer? - Answersa chemical or physiological mechanism that prevents
changes in the H+ concentration and therefore PH
Involves any process in which the atoms in an element gain electrons, with a corresponding
decrease in valence - Answersreduction reaction
refers to the substance being reduced - Answersoxidizing agent
any substance that ionizes in solution to give off H+ - Answersacid
oxidation and reduction reactions that take place together - Answersredox reaction
the term that refers to gain of electrons - Answersreduction
refers to the substance being oxidized - Answersreducing agent
reactions that transfer oxygen, hydrogen atoms or electrons. (a loss of electrons, with a
corresponding gain in valency) - Answersoxidation reaction
Any substance that forms hydroxide ions (OH-) in a water solution. - AnswersBase
the term that refers to the loss of electrons - Answersoxidation
What is the mechanism involved in hydrolysis and what is an example of hydrolysis? -
Answersthe H+ and OH- from water are used to split chemical bonds; digestion
T OR F
the farther a reaction is from equilibrium, the more energy it can release - Answerstrue
