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35 Cards in this Set
- Front
- Back
A cell is isolated for microscopy. It is observed to have supercoiled DNA with histones. Which of the following would also be observed? |
Nucleus
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An isolated cell is observed to absorb oxygen and use it to transform nutrients to energy. Which of the following cellular functions is it displaying?
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Respiration
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A eukaryotic cell is undergoing DNA replication. In which the region of the cell would most of the genetic information be contained? |
Nucleolus
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The fluid mosaic model for biologic membranes describes membrane behavior. According to this model, which of the following float singly or as aggregates in the fluid lipid bilayer |
Integral membrane proteins
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Plasma membrane receptors are available to bind to:
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Ligands
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A patient with metastatic cancer would be expected to have alterations in extracellular matrix that include: |
Decreaded fibronectin
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Which Form of cell communication is used to communicate with other cells in direct physical contact? |
Cell junction
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Pancreatic Beta cells secrete insulin, which inhibits secretion of glucagons from neighboring alpha cells. This action is an example of which of the following signaling types? |
Paracrine
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In cellular metabolism, each enzyme has a high affinity for a:
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Substrate
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An athlete runs a marathon, after which his muscles feels fitigued and unable to contract. A deficiency in which of the following would cause impaired muscle contraction? |
ATP
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The phase of catabolism during which ATP production is highest is: |
Citric acid cycle
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The three phases of cellular catabolism are: |
digestion, glycolysis and oxidation, and the citric acid cycle
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A runner has depleted all the oxygen available for music energy. Which of the following will facilitate his continued muscle performance?
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Anaerobic glycolysis
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The movement of smal, electrically uncharged molecules through a semipermeable barier is an example of: |
diffusion
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Electrolytes are:
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electrically charged molecules
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which of the following is true regarding the predominant extracellular cation? |
Is sodium
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Oncotic pressure (colloid osmotic pressure) is determined by: |
plasma proteins
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A tissue capillary bed has a hydrostatic pressure of 25mmHg and an oncotic pressure of 10 mmH. The filtration pressue is__________ mmHg. |
15
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A patient has a body fluid of 300 mOsm\kg. This measure is termed:
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osmolality
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In cirrhosis, how does cholesterol alter the fluidity of the plasma membrane of erythrocytes? |
Cholesterol decreases the membrane fluidity of the erythrocyte, which reduces its ability to carry oxygen
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The movement of fluid across the arterial end of capillary membranes into the interstitial fluid surrounding the capillary is an example of which process of fluid movement? |
Hydrostatic pressure
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A patient who has diarrhea receives a hypertonic saline solution intravenously to replace the sodium and chloride lost in the stool. What effect will this fluid replacement have on cells? |
Cells will shrink
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How is the transport of glucose from the blood to the cell accomplished? |
By passice-mediated transport (facilitated diffusion)
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How are potassium and sodium transported across plasma membranes? |
by adenosine triphosphate enzyme (ATPase)
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At rest, the membrane potential is nearly the equilibrium potential for potassiu. Why is potassium able to diffuse easily in and out of cells? |
Because the resting plasma membrane is more permeable to potassium
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The ion transporter that moves Na+ and Ca2+ simultaneously in the same direction is an example of which of the following types of transport? |
Symport
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The process during which lysosomal enzymes can be released to degrade engulfed particles is referred to as |
phagocytosis
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The cellular uptke of cholesterol depends on: |
receptor-mediated endocytosis
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The phase during the cell cycle where nuclear and cytoplasmic division occurs is called: |
M
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What causes the rapid change in the resting membrane potential that initiates an action potential? |
Sodium gates open and sodium rushes into the cell changing the membrane potential from negative to positive
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A cell is isolated and electrophysiology studies reveal that the resting membrane potential is -70 millivolts. The predominatn intracellular ion is Na+ and the predominant extracellular ion is K+ With voltage change, which of the following would result in an action potential? |
K+ rushing into the cell
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Platlet-deprived growth factor stimulates the production of: |
connective tissue cells
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The phase of the cell cycle during which the centromeres split and the sister chromatids are pulled apart is reffered to as: |
Anaphase
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What is the role of cytokines in cell reproduction? |
Provide growth factor for tissue growth and development
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A biopsy of the lung bronchi revealed ciliated epithelial cells that are capable of secretion and absorption. These cells are called: |
ciliated simple columnar epithelium
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