Question

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Explanation:

Step1: Identify Cell Membrane (A)

The outermost layer of the cell (A) is the cell membrane. Function: Controls movement of substances in/out of the cell.

Step2: Identify Nucleus (B)

The large, central oval (B) is the nucleus. Function: Contains genetic material, controls cell activities.

Step3: Identify Cell Membrane? Wait, No—Wait, C? Wait, Wait, Let's Re - examine. Wait, the cell membrane is the outer boundary. Wait, maybe A is Cytoplasm? No, Wait, the word bank: Nucleus, Cell Membrane, Cytoplasm, Mitochondria, Ribosome. Let's re - assign:

Wait, the cell structure: The outer layer (A's surrounding? Wait, the diagram: A is the area inside the cell membrane? No, wait, the labels: A, B, C, D, E. Let's correct:

Step1: A - Cytoplasm? No, Wait, the cell membrane is the outer part. Wait, maybe:

A: Cell Membrane (outer boundary, controls entry/exit)
B: Nucleus (central, genetic control)
C: Cell Membrane? No, that can't be. Wait, no, the cell has cell membrane (outer), cytoplasm (inside, jelly - like), nucleus (large round), mitochondria (oval with inner folds), ribosomes (small dots).

So:

A: Cell Membrane (outer layer, function: regulates what enters and exits the cell)
B: Nucleus (large central structure, function: contains DNA, controls cell's activities)
C: Wait, no, maybe A is Cytoplasm? No, the cell membrane is the outer. Wait, perhaps the labels:

A: Cytoplasm (jelly - like substance, holds organelles, site of many reactions)
B: Nucleus (as above)
C: Cell Membrane (outer boundary)
D: Mitochondria (oval, produces energy (ATP) via cellular respiration)
E: Ribosome (small dots, site of protein synthesis)

Wait, let's re - do:

Step1: A - Cell Membrane (outermost, controls transport)

Step2: B - Nucleus (central, genetic control)

Step3: C - Wait, no, maybe A is Cytoplasm. Wait, the cell membrane is the outer, so A could be Cell Membrane, B Nucleus, C (maybe the cell membrane? No, that's duplicate). Wait, no, the word bank has Cell Membrane, Nucleus, Cytoplasm, Mitochondria, Ribosome. So five parts:

So:

A: Cell Membrane (function: protects the cell and regulates what enters and exits)
B: Nucleus (function: contains the cell's genetic material and controls cell activities)
C: Cytoplasm (function: a jelly - like substance that fills the cell, holds organelles in place, and is the site of many cellular processes)
D: Mitochondria (function: produces energy (ATP) through cellular respiration)
E: Ribosome (function: synthesizes proteins)

Wait, but the labels: A is the outer layer? No, maybe A is Cytoplasm (the area inside the cell membrane, outside the nucleus). B is Nucleus. C is Cell Membrane (outer). D is Mitochondria. E is Ribosome.

Let's confirm each:

- Cell Membrane: Outer boundary, controls what goes in/out.
- Nucleus: Large, round, contains DNA.
- Cytoplasm: Gel - like substance inside the cell membrane, where organelles are suspended.
- Mitochondria: Oval - shaped, powerhouses, produce ATP.
- Ribosome: Small, dot - like, make proteins.

So assigning:

A: Cell Membrane (outer layer, function: regulates the passage of substances into and out of the cell)
B: Nucleus (central, function: controls the cell's activities by containing DNA)
C: Cytoplasm (jelly - like, function: supports organelles and is the site of metabolic reactions)
D: Mitochondria (oval, function: generates ATP for energy)
E: Ribosome (small dots, function: synthesizes proteins)

Wait, but the diagram: A is the area between the cell membrane and the nucleus? No, maybe A is Cytoplasm, B is Nucleus, C is Cell Membrane, D is Mitochondria, E is Ribosome.

Let's finalize:

A: Cell Membrane - Function: Regulates the movement of substances in and out of the cell, provides protection and support.
B: Nucleus - Function: Contains the cell's genetic material (DNA), controls the cell's growth, metabolism, and reproduction.
C: Cytoplasm - Function: A semi - fluid substance that fills the cell, in which organelles are suspended; it is the site of many chemical reactions and helps to maintain cell shape.
D: Mitochondria - Function: Known as the "powerhouse of the cell," it generates ATP (adenosine triphosphate) through cellular respiration, providing energy for the cell's activities.
E: Ribosome - Function: The site of protein synthesis; it translates genetic information from mRNA into polypeptide chains (proteins).

Answer:

A = Cell Membrane; Function: Regulates substance entry/exit, protects the cell
B = Nucleus; Function: Contains DNA, controls cell activities
C = Cytoplasm; Function: Supports organelles, site of reactions
D = Mitochondria; Function: Produces ATP (energy) via respiration
E = Ribosome; Function: Synthesizes proteins