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Cell & Molec Exam 2
Terms in this set (50)
Binds substrates in a manner that facilitates the formation of product
What is carboxypeptidase A considered?
A sick person often has a fever, which can inhibit the growth of bacteria because ....
Enzymes don't function as well at temperatures other than the optimal temperature
The equation AB+H20 à A+B would be catalyzed by which of the following classes of enzymes:
What does an allosteric inhibitor do?
It binds at the regulatory site
What does a competitive inhibitor do?
It cannot be processed as a substrate by the enzyme
Where is a prosthetic group in an enzyme located?
It is located in the reaction center; assists in catalysis
An increase in temperature activates chemical reactions by ...
Increasing the numbers of molecules with energy high enough to undergo the reaction
Catalyst is an agent that ...
Enhances the rate of the reaction
Aspirin binds to the prostaglandin synthetase and permanently stops its ability to produce prostaglandin. This is an example of:
Fireflies have the ability to convert the energy in ATP to light. Which of the following types of work is performed?
Nerve impulses travel along the neurons by the opening of channels that allow sodium ions to flow inward, followed by an outward flow of potassium ions. In order to ensure that the impulse may be produced at any time, sodium is actively transported out of the cell, and potassium is transported into the cell by Na+/K- pump:
The statement, the total amount of energy in the universe is constant:
Is a tenet of the first law of thermodynamics
Negative free energy change indicates that:
The reaction is exergonic
Aerobic refers to what property of chemotrophs?
It requires oxygen to produce energy
CO2 generally enters the plant through pores called:
In the chloroplast, the stroma, is the:
Central semifluid region
Which statement accurately describes the Calvin cycle?
Carbon fixation, CO2 is reduced to organic sugars, occurs in chloroplast stroma, a carbon assimilation process
The Calvin cycle occurs in the _______ region of the chloroplast
In the Calvin cycle, the enzyme that catalyzes the capture of carbon dioxide and the formation of 3-phosphoglycerate:
Ribulose diphosphate carboxylase/oxygenase (rubisco)
Biosynthesis of sucrose occurs in the _________
Breakdown of glucose to pyruvate by a cell is an example of:
Negatively charged phosphates of ATP influence one another by:
Gross output of ATP from glycolysis is 4, where as the net output of ATP is:
During strenuous exercise, you may notice your muscles burn ...
Without oxygen, pyruvate is being converted to lactic acid
Energy in the cell can be stored by accumulating reduced compounds because ...
Reduction reactions are endergonic, oxidation reactions are exergonic
Phosphate cleavage of starch or glycogen polymers involves:
Using phosphate to break the bond between monomers
What are products of glycolysis?
ATP, NADH, Pyruvate
In aerobic conditions, pyruvate generated during glycolysis is converted to:
Acetyl CoA and used in aerobic respiration
Gluconeogenesis occurs in the:
What is not a production of the TCA cycle?
What would not be used as a final electron acceptor in anaerobic respiration?
Resting potential of a particular nerve cell is -66mV. Depolarization of the membrane will shift the membrane potential toward:
Based on the graph, what period of time sodium channels start to inactivate?
Based on the graph, what point in the action potential does repolarization?
Based on the graph, at the same time that stimulus was introduced, a drug that specifically inhibits sodium channels was added to the system. Effect this would have is that the membrane would ...
The knee-jerk reflex circuit includes activation of the following neurons:
Sensory, interneuron, and motor innervating the extensor muscle
Structure of an ion channel, the gate and the selectivity filter:
Can be different parts of the channel molecule
your record amplitudes of 0,2,6,8 pA in a single channel experiment. How many channels are in this patch?
the order of events in action potential is
activation of sodium channels, channels, activation of voltage-gated potassium, inactivation of sodium, closing of voltage K+
the main differences between electrical and chemical synapse are?
electrical is faster and bidirectional
signaling distance is increasing in following order
synaptic, paracrine, endocrine signaling
transport systems involved in maintaining low calcium ion concentration in the cytoplasm are/
ER calcium pump, plasma membrane calcium pump, and calcium/sodium exchanger
nitric oxide signaling is involved in regulation of ?
smooth muscle relaxation
not a function of cytoskeleton
correct sequence of microtubule assembly
dimers, oligomers, protofilaments, closing of mircrotuble, elongating microtubule
not a function associated with cytoskeleton
anchoring site for mRNA during transcription
striated muscle has?
light (I-bands) and dark bands (A-bands)
what takes place as muscle contracts?
I bands gets smaller, H zones get smaller, Z lines get closer together
in relaxed muscle, calcium is found in high concentration in the?
Sets with similar terms
Biology Exam 2 Practice Test
Biology 1030 Test 2
Classify a small, quickly moving arthropod with two pairs of antennae, a segmented body, and mandibles that move from side to side.
Where do most Americans get most of their protein? a. from animal sources. b. from plant sources. c. from beef. d. from chicken.
People who explore caves where there is running water but no sunlight often find them populated with unique types of fishes and insects. What testable hypothesis can you develop to explain the ultimate source of energy for these organisms?
Match the situation with the result. _ Cells are in a hypotonic solution. A. The cells lose water. B. The cells gain water. C. The cells stay the same.
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