Question 1

The cellular uptake of cholesterol depends on:

Accepted Answer

A)  active mediated transport. 
B)  the antiport system. 
C)  receptor-mediated endocytosis. 
D)  passive transport. 
A)  active mediated transport. 
B)  the antiport system. 
C)  receptor-mediated endocytosis. 
D)  passive transport.

Question 2

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?

Accepted Answer

A)  Paracrine 
B)  Autocrine 
C)  Neurohormonal 
D)  Hormonal 
A)  Paracrine 
B)  Autocrine 
C)  Neurohormonal 
D)  Hormonal

Question 3

A cell is isolated and electrophysiology studies reveal that the resting membrane potential is -70 millivolts. The predominant intracellular ion is Na+ and the predominant extracellular ion is K+. With voltage change, which of the following would result in an action potential?

Accepted Answer

A)  K+ rushing into the cell 
B)  Na+ rushing into the cell 
C)  Na+ rushing out of the cell 
D)  K+ rushing out of the cell 
A)  K+ rushing into the cell 
B)  Na+ rushing into the cell 
C)  Na+ rushing out of the cell 
D)  K+ rushing out of the cell

Question 4

An athlete runs a marathon, after which his muscles feel fatigued and unable to contract. A deficiency in which of the following would cause impaired muscle contraction?

Accepted Answer

A)  GTP 
B)  AMP 
C)  ATP 
D)  GMP 
A)  GTP 
B)  AMP 
C)  ATP 
D)  GMP

Question 5

What is the role of cytokines in cell reproduction?

Accepted Answer

A)  Provide growth factor for tissue growth and development 
B)  Block progress of cell reproduction through the cell cycle 
C)  Restrain cell growth and development 
D)  Provide nutrients for cell growth and development 
A)  Provide growth factor for tissue growth and development 
B)  Block progress of cell reproduction through the cell cycle 
C)  Restrain cell growth and development 
D)  Provide nutrients for cell growth and development

Question 6

Platelet-derived growth factor stimulates the production of:

Accepted Answer

A)  platelets. 
B)  epidermal cells. 
C)  connective tissue cells. 
D)  fibroblast cells. 
A)  platelets. 
B)  epidermal cells. 
C)  connective tissue cells. 
D)  fibroblast cells.

Question 7

Oncotic pressure (colloid osmotic pressure) is determined by:

Accepted Answer

A)  concentration of sodium. 
B)  plasma proteins. 
C)  hydrostatic pressure. 
D)  availability of membrane transporter proteins. 
A)  concentration of sodium. 
B)  plasma proteins. 
C)  hydrostatic pressure. 
D)  availability of membrane transporter proteins.

Question 8

Which of the following is true regarding the predominant extracellular cation?

Accepted Answer

A)  Has a positive charge 
B)  Migrates toward the positive pole 
C)  Is sodium 
D)  Is potassium 
A)  Has a positive charge 
B)  Migrates toward the positive pole 
C)  Is sodium 
D)  Is potassium

Question 9

What causes the rapid change in the resting membrane potential that initiates an action potential?

Accepted Answer

A)  Potassium gates open, and potassium rushes into the cell changing the membrane potential from negative to positive. 
B)  Sodium gates open, and sodium rushes into the cell changing the membrane potential from negative to positive. 
C)  Sodium gates close, allowing potassium into the cell to change the membrane potential from positive to negative. 
D)  Potassium gates close, allowing sodium into the cell to change the membrane potential from positive to negative. 
A)  Potassium gates open, and potassium rushes into the cell changing the membrane potential from negative to positive. 
B)  Sodium gates open, and sodium rushes into the cell changing the membrane potential from negative to positive. 
C)  Sodium gates close, allowing potassium into the cell to change the membrane potential from positive to negative. 
D)  Potassium gates close, allowing sodium into the cell to change the membrane potential from positive to negative.

Question 10

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?

Accepted Answer

A)  Peripheral membrane proteins 
B)  Integral membrane proteins 
C)  Glycoproteins 
D)  Cell adhesion molecules 
A)  Peripheral membrane proteins 
B)  Integral membrane proteins 
C)  Glycoproteins 
D)  Cell adhesion molecules

Question 11

Plasma membrane receptors are available to bind to:

Accepted Answer

A)  oxygen. 
B)  ribosomes. 
C)  amphipathic lipids. 
D)  ligands. 
A)  oxygen. 
B)  ribosomes. 
C)  amphipathic lipids. 
D)  ligands.

Question 12

The phase of the cell cycle during which the centromeres split and the sister chromatids are pulled apart is referred to as:

Accepted Answer

A)  anaphase. 
B)  telophase. 
C)  prophase. 
D)  metaphase. 
A)  anaphase. 
B)  telophase. 
C)  prophase. 
D)  metaphase.

Question 13

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?

Accepted Answer

A)  Metabolic absorption 
B)  Communication 
C)  Secretion 
D)  Respiration 
A)  Metabolic absorption 
B)  Communication 
C)  Secretion 
D)  Respiration

Question 14

Electrolytes are:

Accepted Answer

A)  small lipid-soluble molecules. 
B)  large protein molecules. 
C)  micronutrients used to produce ATP. 
D)  electrically charged molecules. 
A)  small lipid-soluble molecules. 
B)  large protein molecules. 
C)  micronutrients used to produce ATP. 
D)  electrically charged molecules.

Question 15

A patient has a body fluid of 300 mOsm/kg. This measure is termed:

Accepted Answer

A)  osmolality. 
B)  osmolarity. 
C)  osmotic pressure. 
D)  effective osmolality. 
A)  osmolality. 
B)  osmolarity. 
C)  osmotic pressure. 
D)  effective osmolality.

Exam 1: Cellular Biology

The cellular uptake of cholesterol depends on:

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?

A cell is isolated and electrophysiology studies reveal that the resting membrane potential is -70 millivolts. The predominant intracellular ion is Na+ and the predominant extracellular ion is K+. With voltage change, which of the following would result in an action potential?

An athlete runs a marathon, after which his muscles feel fatigued and unable to contract. A deficiency in which of the following would cause impaired muscle contraction?

What is the role of cytokines in cell reproduction?

Platelet-derived growth factor stimulates the production of:

Oncotic pressure (colloid osmotic pressure) is determined by:

Which of the following is true regarding the predominant extracellular cation?

What causes the rapid change in the resting membrane potential that initiates an action potential?

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?

Plasma membrane receptors are available to bind to:

The phase of the cell cycle during which the centromeres split and the sister chromatids are pulled apart is referred to as:

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?

Electrolytes are:

A patient has a body fluid of 300 mOsm/kg. This measure is termed:

Genes and Genetic Diseases

Altered Cellular and Tissue Biology

Fluids and Electrolytes, Acids and Bases

Innate Defenses: Inflammation

Adaptive Immunity

Hypersensitivities, Infection, and Immune Deficiencies

Stress and Disease

Biology of Cancer and Tumor Spread

Cancer Epidemiology, Manifestations, and Treatment

Cancer in Children

Structure and Function of the Neurologic System

Pain, Temperature, Sleep, and Sensory Function

Concepts of Neurologic Dysfunction

Alterations of Neurologic Function

Alterations of Neurologic Function in Children

Mechanisms of Hormonal Regulation

Alterations of Hormonal Regulation

Structure and Function of the Hematologic System

Alterations of Hematologic Function

Alterations of Hematologic Function in Children

Structure and Function of the Cardiovascular and Lymphatic Systems

Alterations of Cardiovascular Function

Alterations of Cardiovascular Function in Children

Structure and Function of the Pulmonary System

Alterations of Pulmonary Function

Alterations of Pulmonary Function in Children

Structure and Function of the Renal and Urologic Systems

Alterations of Renal and Urinary Tract Function

Alterations of Renal and Urinary Tract Function in Children

Structure and Function of the Reproductive Systems

Alterations of the Reproductive Systems, Including Sexually Transmitted Infections

Structure and Function of the Digestive System

Alterations of Digestive Function

Alterations of Digestive Function in Children

Structure and Function of the Musculoskeletal System

Alterations of Musculoskeletal Function

Alterations of Musculoskeletal Function in Children

Structure, Function, and Disorders of the Integument

Alterations of the Integument in Children

Filters

A cell is isolated and electrophysiology studies reveal that the resting membrane potential is -70 millivolts. The predominant intracellular ion is Na⁺ and the predominant extracellular ion is K⁺. With voltage change, which of the following would result in an action potential?