1973736
Descripción
Test por Mrs. Reema Al Bitar, actualizado hace más de 1 año
|
|
Creado por Mrs. Reema Al Bitar
hace más de 9 años
|
|
Pregunta 1
Pregunta
1. Which of the following best describes the main purpose of the combined processes of glycolysis and cellular respiration?
Respuesta
-
breaking down ATP, so that ADP and P can be reused
-
transforming the energy in glucose and related molecules in a chemical form that cells can use for work
-
the breakdown of glucose to carbon dioxide and water
-
producing complex molecules from chemical building blocks
Pregunta 2
Pregunta
In the combined processes of glycolysis and cellular respiration, what is consumed and what is produced?
Respuesta
-
Water is consumed, and ATP is produced.
-
Oxygen is consumed, and glucose is produced.
-
Carbon dioxide is consumed, and water is produced.
-
Glucose is consumed, and carbon dioxide is produced.
-
ATP is consumed, and oxygen is produced.
Pregunta 3
Pregunta
Substrate-level phosphorylation occurs _____.
Respuesta
-
in glycolysis only
-
in both glycolysis and the citric acid cycle
-
during oxidative phosphorylation
-
in the citric acid cycle
Pregunta 4
Pregunta
The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____.
Respuesta
-
gains electrons and loses potential energy
-
loses electrons and gains potential energy
-
loses electrons and loses potential energy
-
gains electrons and gains potential energy
Pregunta 5
Pregunta
When electrons move closer to a more electronegative atom, what happens? The more electronegative atom is _____.
Respuesta
-
oxidized, and energy is released
-
oxidized, and energy is consumed
-
reduced, and energy is released
-
reduced, and energy is consumed
Pregunta 6
Pregunta
Which of the following statements about NAD+ is true?
Respuesta
-
NAD+ has more chemical energy than NADH.
-
In the absence of NAD+, glycolysis can still function.
-
NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
-
NAD+ can donate electrons for use in oxidative phosphorylation.
Pregunta 7
Pregunta
Which of the following describes the process of glycolysis?
Respuesta
-
It converts one glucose molecule to two molecules of pyruvate and carbon dioxide.
-
It represents the first stage in the chemical oxidation of glucose by a cell.
-
Glycolysis occurs in the mitochondria.
-
Glycolysis produces 30 ATP from each molecule of glucose.
-
It requires ATP and NADH.
Pregunta 8
Pregunta
The free energy for the oxidation of glucose to CO2 and water is -686 kcal/mol and the free energy for the reduction of NAD+ to NADH is +53 kcal/mol. Why are only two molecules of NADH formed during glycolysis when it appears that as many as a dozen could be formed?
Respuesta
-
There is no CO2 or water produced as products of glycolysis.
-
Most of the free energy available from the oxidation of glucose is used in the production of ATP in glycolysis.
-
Most of the free energy available from the oxidation of glucose remains in pyruvate, one of the products of glycolysis.
-
Glycolysis is a very inefficient reaction, with much of the energy of glucose released as heat.
Pregunta 9
Pregunta
Starting with one molecule of glucose, the energy-containing products of glycolysis are _____.
Respuesta
-
2 NAD+, 2 pyruvate, and 2 ATP
-
2 NADH, 2 pyruvate, and 2 ATP
-
2 FADH2, 2 pyruvate, and 4 ATP
-
6 CO2, 2 pyruvate, and 2 ATP
Pregunta 10
Pregunta
Which kind of metabolic poison would most directly interfere with glycolysis?
Respuesta
-
an agent that closely mimics the structure of glucose but is not metabolized
-
an agent that reacts with NADH and oxidizes it to NAD+
-
an agent that binds to pyruvate and inactivates it
-
an agent that reacts with oxygen and depletes its concentration in the cell
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.