Exam 3 Flashcards
(20 cards)
What is the correct statement about aerobic respiration?
Oxidation of organic structures releases energy. This energy is used for ATP synthesis
Where do glycolysis and TCA cycle occur in a prokaryotic cell?
Both occur in the cytoplasm
Where do the Krebs Cycle and respiratory ETC occur in a eukaryotic cell?
In the matrix and across the mitochondrial inner membrane
Which of the following occurs in glycolysis?
NAD+ is reduced to NADH
Which is the correct terminology describing how ATP synthesis occurs in glycolysis and citric acid cycle?
ATP is synthesized by substrate level phosphorylation in both processes
What is the energy source for the TCA cycle, and what becomes of this material?
The TCA cycle receives pyruvate generated by glycolysis; for each carbon entering the cycle, one CO2 is made
Which of the following occurs in the respiratory ETC?
Proton potential accumulates in the mitochondrial inner membrane space
Which is the role of oxygen in respiratory ETC?
Electrons arriving at the end of the transport chain have given up most of their potential; oxygen receives them, forming water
In which way is the function of the electron transport chain connected to the function of glycolysis and TCA cycle?
ETC receives, and oxidizes, NADH from both processes
Which is the correct statement about carbon metabolites generated by glycolysis during fermentation?
Pyruvate from glycolysis is used as an “electron dump” for accumulated NADH
Which of the following occurs during the reduction phase of the Calvin cycle?
An oxygen atom on the carboxyl function is replaced with a hydrogen (:H) turning an organic acid into a sugar molecule
Which describes the relation between the ligand and the receptor protein during signal perception?
The ligand binds to the receptor, activating it
What is the role of the phosphatase enzyme in a signal transduction “phosphorylation cascade”?
Phosphatases silence signal transduction by removing phosphate groups from active proteins
What does the cell cycle represent?
The cell cycle summarizes the regular events of cell growth and mitotic cell division
Which of the following describes the outcome of following describes the outcome of mitotic cell division?
Mitotic cell division generates two genetically identical cells
S-phase is the part of the cell cycle during which DNA is synthesized and chromosomes are duplicated. During which part of M-phase does S-phase occur?
It does not; S-phase is a part of interphase, not M-phase
Anaphase – and the remaining of sister chromatids as “chromosomes” – begins when which of these events occurs?
Cohesin proteins are released, allowing sister chromatids to separate
Which of the following is a description of a cell cycle “checkpoint” as we described them in lecture?
The cell monitors its progress through the cell cycle and mitosis. Progress may be permitted or blocked at these points
How do we describe the process by which prokaryotic cells reproduce? Identify the correct statement.
Prokaryotic cells reproduce asexually through binary fission
What is the role of the secretory system in cytokinesis?
In plants, the secretory system deposits a new wall and membrane at the middle of the elongated cell, dividing it
