Question 1

Which of the following occurs when voltage-gated Na⁺ channels have just closed in a neuron?

Accepted Answer

A) The membrane becomes less polarized than when at rest. 
B) The membrane becomes more polarized than when at rest. 
C) The membrane becomes polarized to the same degree as when at rest. 
D) The membrane becomes hyperpolarized. 
A) The membrane becomes less polarized than when at rest. 
B) The membrane becomes more polarized than when at rest. 
C) The membrane becomes polarized to the same degree as when at rest. 
D) The membrane becomes hyperpolarized.

Question 2

Which of the following receptor superfamilies are G proteins associated with?

Accepted Answer

A) oligomeric ligand-gated ion channels 
B) 7-transmembrane segment (7-TMS)receptors 
C) cell adhesion protein receptors 
D) single-transmembrane segment catalytic receptors 
A) oligomeric ligand-gated ion channels 
B) 7-transmembrane segment (7-TMS)receptors 
C) cell adhesion protein receptors 
D) single-transmembrane segment catalytic receptors

Question 3

Calcium-binding proteins all possess 2 or more characteristic peptide domains for Ca²⁺ binding that consist of a short a-helix,a loop of 12 amino acids,and a second a-helix (helix-loop-helix).Which of the following motifs best describes these peptide domains?

Accepted Answer

A) basic region leucine zipper 
B) zinc finger 
C) EF hand 
D) beta-beta 
A) basic region leucine zipper 
B) zinc finger 
C) EF hand 
D) beta-beta

Question 4

Which of the following is NOT a component of the G protein-coupled receptor (GPCR),hormone signal,transduction unit?

Accepted Answer

A) DAG 
B) hormone sensitive lipase 
C) membrane receptor 
D) adenylate cyclase 
A) DAG 
B) hormone sensitive lipase 
C) membrane receptor 
D) adenylate cyclase

Question 5

Which of the following is NOT activated by transient increases in cytoplasmic Ca²⁺ levels?

Accepted Answer

A) muscle contraction 
B) glucose uptake 
C) exocytosis 
D) glycogen metabolism 
A) muscle contraction 
B) glucose uptake 
C) exocytosis 
D) glycogen metabolism

Question 6

Which of the following explains why receptor tyrosine kinases have been called membrane-associated allosteric enzymes?

Accepted Answer

A) as a result of their induced conformation changes and oligomeric interactions 
B) as a result of their binding to insulin and epinephrine 
C) as a result of their GTPase and guanylyl cyclase activities 
D) as a result of their complex structure and G protein binding 
A) as a result of their induced conformation changes and oligomeric interactions 
B) as a result of their binding to insulin and epinephrine 
C) as a result of their GTPase and guanylyl cyclase activities 
D) as a result of their complex structure and G protein binding

Question 7

Which of the following is NOT a catecholamine neurotransmitter?

Accepted Answer

A) γ-aminobutyrate (GAB
A)  
B) L-dopa 
C) dopamine 
D) epinephrine 
A) γ-aminobutyrate (GAB
A)  
B) L-dopa 
C) dopamine 
D) epinephrine

Which of the following occurs when voltage-gated Na⁺ channels have just closed in a neuron?

Which of the following receptor superfamilies are G proteins associated with?

Calcium-binding proteins all possess 2 or more characteristic peptide domains for Ca²⁺ binding that consist of a short a-helix,a loop of 12 amino acids,and a second a-helix (helix-loop-helix).Which of the following motifs best describes these peptide domains?

Which of the following is NOT a component of the G protein-coupled receptor (GPCR),hormone signal,transduction unit?

Which of the following is NOT activated by transient increases in cytoplasmic Ca²⁺ levels?

Which of the following explains why receptor tyrosine kinases have been called membrane-associated allosteric enzymes?

Which of the following is NOT a catecholamine neurotransmitter?

The Facts of Life: Chemistry Is the Logic of Biological Phenomena

Water: the Medium of Life

Thermodynamics of Biological Systems

Amino Acids

Proteins: Their Primary Structure and Biological Functions

Proteins: Secondary, tertiary, and Quaternary Structure

Carbohydrates and the Glycoconjugates of Cell Surfaces

Lipids

Lipid Biosynthesis

Membranes and Membrane Transport

Enzymes Kinetics and Specificity

Mechanisms of Enzyme Action

Enzyme Regulation

Molecular Motors

Nutrition and the Organization of Metabolism

Glycolysis

The Tricarboxylic Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Fatty Acid Catabolism

Nitrogen Acquisition and Amino Acid Metabolism

Nucleotides and Nucleic Acids

Structure of Nucleic Acids

Synthesis and Degradation of Nucleotides

Recombinant Dna: Cloning and Creation of Chimeric Genes

DNA Metabolism: Replication, recombination, and Repair

Transcription and the Regulation of Gene Expression

Protein Synthesis

Post-Transcriptional Regulation of Gene Expression

Completing the Protein Life Cycle: Folding, processing, and Degradation

Metabolic Integration and Organ Specialization

Filters

Exam 11: The Reception and Transmission of Extracellular Information

Which of the following occurs when voltage-gated Na⁺ channels have just closed in a neuron?

Which of the following receptor superfamilies are G proteins associated with?

Calcium-binding proteins all possess 2 or more characteristic peptide domains for Ca²⁺ binding that consist of a short a-helix,a loop of 12 amino acids,and a second a-helix (helix-loop-helix).Which of the following motifs best describes these peptide domains?

Which of the following is NOT a component of the G protein-coupled receptor (GPCR),hormone signal,transduction unit?

Which of the following is NOT activated by transient increases in cytoplasmic Ca²⁺ levels?

Which of the following explains why receptor tyrosine kinases have been called membrane-associated allosteric enzymes?

Which of the following is NOT a catecholamine neurotransmitter?

The Facts of Life: Chemistry Is the Logic of Biological Phenomena

Water: the Medium of Life

Thermodynamics of Biological Systems

Amino Acids

Proteins: Their Primary Structure and Biological Functions

Proteins: Secondary, tertiary, and Quaternary Structure

Carbohydrates and the Glycoconjugates of Cell Surfaces

Lipids

Lipid Biosynthesis

Membranes and Membrane Transport

Enzymes Kinetics and Specificity

Mechanisms of Enzyme Action

Enzyme Regulation

Molecular Motors

Nutrition and the Organization of Metabolism

Glycolysis

The Tricarboxylic Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Fatty Acid Catabolism

Nitrogen Acquisition and Amino Acid Metabolism

Nucleotides and Nucleic Acids

Structure of Nucleic Acids

Synthesis and Degradation of Nucleotides

Recombinant Dna: Cloning and Creation of Chimeric Genes

DNA Metabolism: Replication, recombination, and Repair

Transcription and the Regulation of Gene Expression

Protein Synthesis

Post-Transcriptional Regulation of Gene Expression

Completing the Protein Life Cycle: Folding, processing, and Degradation

Metabolic Integration and Organ Specialization

Filters