GRE Subject Test: Biochemistry, Cell, and Molecular Biology : Help with Second Messengers
Study concepts, example questions & explanations for GRE Subject Test: Biochemistry, Cell, and Molecular Biology
All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources
Example Questions
Example Question #1 : Cellular Signals And Communication
Which of the following is a common second messenger used in signal transduction pathways?
Receptor tyrosine kinases
cAMP
G
Epinephrine
cAMP
Second messengers are the molecules in a signal transduction pathway that will activate an intracellular response. Epinephrine is a hormone that will bind a receptor on the exoplasmic face of the cell, making is a first messenger. G
Example Question #2 : Help With Second Messengers
Which of the following signaling molecules does not elicit a second messenger response inside cells?
Large peptides
Glucagon
Steroid hormones
Peptide hormones
Steroid hormones
A second messenger response is created in cells that use signal transduction, meaning that the signaling molecules attach to a receptor on the outside of the cell. Steroid hormones are largely nonpolar, and can enter the cell in order to affect cellular processes at the level of transcription. As a result, they do not need to rely on second messenger pathways in order to elicit a response.
All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources
