Question 1

ABC superfamily proteins are thought to act as ATP-dependent flippases in transporting:

Accepted Answer

A) lipophilic drugs out of mammalian cells. 
B) Ca²⁺ out of mammalian cells. 
C) H⁺ out of mammalian cells. 
D) Na⁺ out of mammalian cells,K⁺ into mammalian cells. 
A) lipophilic drugs out of mammalian cells. 
B) Ca²⁺ out of mammalian cells. 
C) H⁺ out of mammalian cells. 
D) Na⁺ out of mammalian cells,K⁺ into mammalian cells.

Question 2

What evidence suggests that all of the P-class ion pumps evolved from a common ancestor even though they now transport different ions?

Accepted Answer

The catalytic subunits of all P-class io

Question 3

How can a uniporter,GLUT2,be sufficient for entry of glucose from intestinal epithelial cells into the bloodstream?

Accepted Answer

Glucose is actually present in a higher

Question 4

The partition coefficient K,the equilibrium constant for partitioning between oil and water,for butyric acid is about 10-²,and for 1,4-butanediol it is about 10-⁴.You add liposomes containing only water to a solution with an initial concentration of 1 mM butyric acid and 100 mM 1,4-butanediol outside the liposomes.What is the relative rate of diffusion of the two substances into the liposome interior?

Accepted Answer

A) Butyric acid diffuses into the liposome 100-fold faster than butanediol. 
B) The two diffuse into the liposome at equal rates. 
C) Butanediol diffuses into the liposome 100-fold faster than butanediol. 
D) Not enough information is provided to permit an answer. 
A) Butyric acid diffuses into the liposome 100-fold faster than butanediol. 
B) The two diffuse into the liposome at equal rates. 
C) Butanediol diffuses into the liposome 100-fold faster than butanediol. 
D) Not enough information is provided to permit an answer.

ABC superfamily proteins are thought to act as ATP-dependent flippases in transporting:

What evidence suggests that all of the P-class ion pumps evolved from a common ancestor even though they now transport different ions?

How can a uniporter,GLUT2,be sufficient for entry of glucose from intestinal epithelial cells into the bloodstream?

Chemical Foundations

Molecular Genetic Techniques

Protein Structure and Function

Culturing and Visualizing Cells

Fundamental Molecular Genetic Mechanisms

Bio-membrane Structure

Genes Genomics and Chromosomes

Transcriptional Control of Gene Expression

Post-Transcriptional Gene Control

Cellular Energetics

Moving Proteins Into Membranes and Organelles

Vesicular Traffic, Secretion, and Endocytosis

Signal Transduction and G-Protein Coupled Receptors

Signaling Pathways That Control Gene Activity

Cell Organization and Movement I: Microfilaments

Cell Organization and Movement II: Microtubules and Intermediate Filaments

Regulating the Eukaryotic Cell Cycle

Integrating Cells Into Tissues

Cell Birth, Lineage, and Death

Nerve Cells

Immunology

Cancer

Filters

Exam 10: Transmembrane Transport of Ions and Small Molecules

ABC superfamily proteins are thought to act as ATP-dependent flippases in transporting:

What evidence suggests that all of the P-class ion pumps evolved from a common ancestor even though they now transport different ions?

How can a uniporter,GLUT2,be sufficient for entry of glucose from intestinal epithelial cells into the bloodstream?

Chemical Foundations

Molecular Genetic Techniques

Protein Structure and Function

Culturing and Visualizing Cells

Fundamental Molecular Genetic Mechanisms

Bio-membrane Structure

Genes Genomics and Chromosomes

Transcriptional Control of Gene Expression

Post-Transcriptional Gene Control

Cellular Energetics

Moving Proteins Into Membranes and Organelles

Vesicular Traffic, Secretion, and Endocytosis

Signal Transduction and G-Protein Coupled Receptors

Signaling Pathways That Control Gene Activity

Cell Organization and Movement I: Microfilaments

Cell Organization and Movement II: Microtubules and Intermediate Filaments

Regulating the Eukaryotic Cell Cycle

Integrating Cells Into Tissues

Cell Birth, Lineage, and Death

Nerve Cells

Immunology

Cancer

Filters