Which of the following integral proteins allows ions to pass into or out of the cell?
Receptor
Channel
Ligand
Peripheral
The Correct Answer is B
a: Receptor - Receptors are proteins that bind to signaling molecules (ligands) outside the cell and initiate cellular responses but do not typically facilitate ion movement.
b. Channel-Integral membrane proteins called ion channels create pores in the cell membrane, allowing specific ions to pass through, thus facilitating ion movement into or out of the cell.
c: Ligand - Ligands are signaling molecules that bind to receptors, activating them, but they do not facilitate ion movement.
d: Peripheral - Peripheral proteins are found on the surface of the cell membrane but are not typically involved in creating ion channels
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Related Questions
Correct Answer is B
Explanation
a. The plasma membrane is composed of a bilayer of protein molecules: This is incorrect. The plasma membrane is primarily composed of a bilayer of phospholipids, with proteins interspersed within this bilayer.
b. The plasma membrane is selectively permeable: This is correct. The plasma membrane regulates the entry and exit of substances, allowing certain molecules to pass while restricting others.
c. The plasma membrane does not participate in cellular activities: This is incorrect. The plasma membrane is actively involved in various cellular activities, including signaling, transport, and maintaining homeostasis.
d. The plasma membrane receptors are specialized lipids: This is incorrect. Receptors on the plasma membrane are typically proteins, not lipids, which are involved in signal transduction and cellular communication.
Correct Answer is B
Explanation
a. Produce chemicals that regulate the level of the immune response: While some T-cells can secrete cytokines that regulate the immune response, this is not the primary function of helper T-cells.
b. Recognize foreign antigens and initiate an immune response. Helper T-cells (Th cells) are a type of lymphocyte crucial in cell-mediated immunity. They play a central role in recognizing and identifying foreign antigens (substances recognized as foreign by the immune system). Once they recognize an antigen, they activate other immune cells like cytotoxic T cells and B cells to mount an immune response.
c. Chemically destroy foreign antigens by disrupting cell membranes: This is the function of cytotoxic T cells, not helper T-cells.
d. Create antibodies to target foreign antigens: Antibody production is the function of B cells activated by helper T-cells.
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