Scientists are testing substance L to determine how it enters mammalian cells in a culture. The cells
Question:
Scientists are testing substance L to determine how it enters mammalian cells in a culture. The cells maintain a 120 millimolar (mM) intracellular concentration of substance L. The scientists determined the rate of entry of substance L into the cells at various external concentrations of substance L (10 to 100 mM) in culture medium (Table 1). Table 1. Rate of entry of substance L into mammalian cells in culture
External concentration of substance L (mM) Rate of entry of substance L into cell as a percent of maximum
The cells maintain substance L at an internal concentration of 120 mM.
(a) Identify the most likely mode of transport across the membrane for substance L. Explain how information provided helps determine the most likely mode of transport.
Biochemistry Concepts and Connections
ISBN: 978-0321839923
1st edition
Authors: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews