medium · MCAT bio-biochem
A scientist compares the mechanism of action of Insulin (a peptide hormone) and Testosterone (a steroid hormone).
Which of the following statements correctly describes their behavior at the cellular level?
- Insulin produces long-lasting, slow-onset effects on target cells, whereas Testosterone instead produces much more rapid, short-lived effects overall.
- Both hormones require a dedicated protein carrier to travel freely through the bloodstream, and both ultimately bind to the same cytosolic receptor type.
- Insulin enters the nucleus directly to act as a transcription factor regulating gene expression, while Testosterone instead activates a G-protein-coupled receptor.
- Insulin binds to a cell-surface receptor and triggers a second-messenger cascade; Testosterone binds to an intracellular receptor to alter gene expression.
Sign up free to see the explanation and track your rank →
More MCAT bio-biochem practice
- What genetic term describes a single gene influencing multiple seemingly unrelated traits?
- In the human ear, sound waves cause fluid in the cochlea to… — Which cells are responsible
- An electrophysiologist observes a neuron at its resting memb… — Which ion is primarily res
- A researcher discovers that a population of bacteria survives exposure to an antibiotic be
- Which structure is most likely dysfunctional?
- Which organelle would you expect to be exceptionally well-developed in these cells?
- Which molecule acts as a 'fluidity buffer' in animal cell membranes?
- A scientist is tracking the movement of a secreted protein. If the protein has just left t