Question

Which of the following protein functions is not correctly associated with its correct integral protein?
A. Carrier- protein passage of molecules through the membrane
B. Enzymatic proteins carry out metabolic reactions directly
C. Channel proteins block the activity of carrier proteins
D. Cell recognition proteins recognize pathogens

Answer 1

Hint: Proteins are big, complex molecules that play a number of important tasks in the human body. They are essential for the structure, function, and control of the body's tissues and organs, and they do the majority of their activity in cells.
Proteins are made up of hundreds or thousands of smaller units known as amino acids that are linked in lengthy chains. A protein is made up of twenty different types of amino acids that can be mixed. Each protein's three-dimensional shape and function are determined by its amino acid sequence. Combinations of three DNA building pieces, dictated by gene sequence, code for amino acids.

Complete answer:
Option A: Carrier proteins bind to certain molecules and carry them across the membrane on one side. They subsequently go through conformational changes, allowing the molecule to pass through the membrane and out the other side.
So, option A is incorrect.
Option B: Enzymatic proteins that carry out metabolic reactions directly are found in several plasma membrane proteins. A cell would never be able to complete the metabolic activities required for appropriate function without the presence of enzymes, some of which are connected to the cell's different membranes.
So, option B is not correct.
Option C: The two types of membrane transport proteins that cross the lipid bilayer are channel proteins and carrier proteins. Carrier proteins transport solutes in both active and passive modes, whereas channel proteins only transport solutes in passive mode.
So, option C is correct.
Option D: The innate immune system, which identifies pathogens in a broad sense, relies heavily on cell–cell recognition. The binding of phagocyte pattern recognition receptors (PRRs) to pathogen-associated molecular patterns (PAMPs) in pathogenic bacteria is crucial to this process.
So, option D is not correct.

Therefore, Option C is the correct answer.

Note:
Membrane proteins help organisms survive by performing a range of tasks:
Signals are relayed between the cell's internal and exterior environments through membrane receptor proteins.
Molecules and ions are transported across the membrane by transport proteins. The Transporter Classification database can be used to classify them.
Membrane enzymes can perform a variety of functions, including oxidoreductase, transferase, and hydrolase.
Cell adhesion molecules allow cells to recognise and interact with one another. Proteins involved in immunological response, for example.