This image is a detailed diagram of an
animal cell, showing its major organelles and structures. The task is to label each lettered part with the correct name of the cellular component.
Here’s the solution with explanations:
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a. Nucleolus
→ Located inside the nucleus, this dense region is responsible for ribosome assembly (synthesizing rRNA and assembling ribosomal subunits).
b. Nuclear envelope (or Nuclear membrane)
→ A double-membrane structure that surrounds the nucleus, separating it from the cytoplasm. It has pores that regulate transport between nucleus and cytoplasm.
c. Chromatin
→ The complex of DNA and proteins (histones) found inside the nucleus. It condenses into chromosomes during cell division.
d. Rough Endoplasmic Reticulum (Rough ER)
→ A network of membranous tubules studded with ribosomes on the cytoplasmic side. It synthesizes and folds proteins destined for secretion or insertion into membranes.
e. Smooth Endoplasmic Reticulum (Smooth ER)
→ Lacks ribosomes; involved in lipid synthesis, detoxification, and calcium ion storage.
f. Golgi Apparatus (Golgi Body)
→ A stack of flattened membranous sacs that modifies, sorts, and packages proteins from the ER for secretion or delivery to other organelles.
g. Cytoskeleton (specifically microtubules shown here)
→ A network of protein filaments (microtubules, intermediate filaments, microfilaments) that maintains cell shape, enables cell movement, and facilitates intracellular transport. The lines radiating outward are microtubules.
h. Mitochondrion (plural: mitochondria)
→ The “powerhouse” of the cell; generates ATP through aerobic respiration. Has a double membrane and inner folds called cristae.
i. Plasma Membrane (Cell Membrane)
→ The phospholipid bilayer that encloses the cell, regulating what enters and exits. Maintains homeostasis and protects the cell interior.
j. Lysosome
→ Membrane-bound vesicles containing digestive enzymes. Breaks down waste materials, cellular debris, and foreign invaders.
k. Ribosome
→ Small structures (free in cytoplasm or attached to rough ER) that synthesize proteins by translating mRNA. Not membrane-bound.
l. Cytoplasm
→ The gel-like substance filling the cell, surrounding organelles. Site of many metabolic reactions. Contains cytosol and organelles.
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✔ Final Answer (Labeling):
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a. Nucleolus
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b. Nuclear envelope
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c. Chromatin
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d. Rough Endoplasmic Reticulum
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e. Smooth Endoplasmic Reticulum
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f. Golgi Apparatus
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g. Cytoskeleton (Microtubules)
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h. Mitochondrion
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i. Plasma Membrane
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j. Lysosome
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k. Ribosome
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l. Cytoplasm
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Note: In some diagrams, “g” might be labeled as “Centrosome” if centrioles are visible — but here, since it points to radiating microtubules, “Cytoskeleton” (specifically microtubules) is more accurate. If your curriculum emphasizes centrosomes, you may check if the small dots near g are centrioles — but based on standard labeling and visual context, cytoskeleton is correct.
Let me know if you need a printable version or quiz-style flashcards for memorization!
Parent Tip: Review the logic above to help your child master the concept of animal cell worksheet labeling.
