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practice exam

Biology exam 3 practice exam review

QuestionAnswer
Molecules that come from the food we eat provide energy for the amazing work that goes on inside of our cells. This energy, stored inside of our food, is a form of ______. potential energy called chemical energy
Anabolic pathways: consume energy to build up polymers from monomers.
Which of the following is part of the first law of thermodynamics? Energy cannot be created or destroyed
Which of the following is TRUE for all exergonic reactions? The reactants have more total energy than the products and the reaction proceeds with a net release of free energy
Which of the following reactions could be coupled to the reaction ATP + H2O → ADP + Pi (-7.3 kcal/mol)? E + Pi → EP (+5 kcal/mol)
Which of the following is MOST similar in structure to ATP? an RNA nucleotide
which of the following statements regarding enzymes is TRUE? Enzymes increase the rate of reaction.
) The region of an enzyme to which a substrate binds is called the ______ site Active
When chemical, transport, or mechanical work is done by an organism, what happens to the heat generated? It is lost to the environment
The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is most precisely described as: feedback inhibition.
A competitive inhibitor of an enzyme will bind to: the active site of the enzyme
Some bacteria are metabolically active in hot springs because: their enzymes have high optimal temperatures.
Cellular respiration produces energy and: water and carbon dioxide.
In aerobic respiration, how many molecules of pyruvate are produced from four molecules of glucose? 8
Which of the following is a characteristic of fermentation? breaks down pyruvate and produces NAD+, occurs in the absence of oxygen, produces acids, gases and alcohol
In addition to 2 NADH, what are the end products of glycolysis? 2 ATP and 2 pyruvates
Which phase makes the greatest contribution of electrons to the electron transport chain? the citric acid cycle
The two carbons that enter the citric acid cycle enter as? Acetyl-CoA
What directly powers ATP synthase to produce ATP? flow of hydrogen ions down a concentration gradient through the enzyme
Of the four biological macromolecules, all BUT what can be used in cellular respiration to produce energy in the form of ATP for the cell? nucleic acids
During redox reactions, ______. the loss of electrons from one substance is called reduction
The small amount of ATP produced by substrate-level phosphorylation occurs during: both glycolysis and the citric acid cycle
In the reaction shown below, what is/are the products(s)? Fructose 1,6-bisphosphate and ADP
The FINAL electron acceptor of aerobic respiration is ______. oxygen
When oxygen delivery becomes insufficient to support a runner’s aerobic metabolism, cells switch to an emergency mode in which ______. ATP is inefficiently produced, and lactic acid is generated as a by-product
During photosynthesis, the Calvin cycle utilizes what molecules produced by the light reactions? NADPH and ATP
Producers that create organic molecules by using light energy and carbon dioxide are also called: autotrophs
Which color/wavelengths of light would be LEAST useful to photosynthesis? green
Which of the following is the ultimate source of electrons for the light reactions using linear electron flow? H2O
Which of these events occurs in the light reactions of photosynthesis? a phosphate group is added to ADP producing ATP
Generation of proton gradients across membranes occurs during: respiration
Created by: josie_d
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