FREE Biochemistry Cellular Process Questions and Answers
What is the primary function of the phospholipid bilayer in the cell membrane?
The phospholipid bilayer forms the cell membrane, which acts as a selective barrier, controlling the entry and exit of molecules while maintaining the internal environment of the cell.
Which of the following best describes passive transport?
Passive transport involves the movement of molecules from high to low concentration without the need for energy (e.g., simple diffusion, facilitated diffusion).
During the signal transduction process, what role does a second messenger, such as cAMP, play?
Second messengers like cyclic AMP (cAMP) amplify the signal received by a receptor and help propagate it inside the cell, leading to specific cellular responses.
In oxidative phosphorylation, ATP synthesis is powered by:
The proton gradient, established by the electron transport chain across the inner mitochondrial membrane, drives ATP synthesis through ATP synthase.
Which of the following processes requires energy input in the form of ATP?
Active transport moves molecules against their concentration gradient using energy from ATP, unlike osmosis, simple diffusion, or facilitated diffusion, which are energy-independent processes.