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Latest revision as of 07:50, 17 April 2024

Welcome to the explain xkcd wiki!
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Go to this comic explanation

Cell Organelles
It's believed that Golgi was originally an independent organism who was eventually absorbed into our cells, where he began work on his Apparatus.
Title text: It's believed that Golgi was originally an independent organism who was eventually absorbed into our cells, where he began work on his Apparatus.

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: Created by a GOLGI ENDOPLASMIC RETICULUM. Do NOT delete this tag too soon.

This comic depicts a biological cell diagram with a mix of real and fictional organelles, blending accurate cell biology terms with misplaced or absurd labels. While it includes actual cell components like the nucleus, mitochondria, and Golgi apparatus, it also includes unrelated concepts from various fields such as geology, engineering, software, and pop culture. Labels like "evil endoplasmic reticulum" and "sticky endoplasmic reticulum" make fun of scientific terms. The comic plays on the complexity and diversity of cell structures by mixing in unrelated and humorous terms, highlighting the often confusing and intricate nature of scientific diagrams with clever wordplay and cross-disciplinary jokes.

The title text adds a humorous fictional backstory to the Golgi apparatus, an essential cell organelle involved in processing and packaging proteins. It playfully suggests that Camillo Golgi, the scientist who discovered the Golgi apparatus, was originally an independent organism. This organism was supposedly absorbed into our cells, where it then started working on what is now known as the Golgi apparatus. The joke is a satirical take on endosymbiotic theory, which posits that certain organelles within eukaryotic cells, like mitochondria and chloroplasts, originated from independent symbiotic prokaryotic organisms that were absorbed by a host germ cell. Golgi appears to be depicted in the comic as a tiny alien being.

Label Meaning Real? Cell organelle? Explanation
Carbonation Carbon dioxide dissolved in a liquid. Yes No Carbonation causes soda pop and similar liquids to bubble, fizz, foam, and effervesce.
Cellophane A thin, transparent sheet made of regenerated cellulose. Yes No A type of packaging material. A cell wall is indeed made of cellulose, though not in the form cellophane. Also, this drawing looks more like an animal cell, which (unlike plants and fungi) should not have a cell wall.
Chloroplasts if you're lucky Organelles in plant cells responsible for photosynthesis. Yes Yes Actual cell organelles, only found in plant cells. The phrase "if you're lucky" could simply be a comment on chloroplasts not being found in all cells, or it could suggest that of all foreign objects that Randall could have added to an animal cell, chloroplasts are one of the least dangerous.
Drain plug A stopper for a drain. Yes Conceivably A plumbing term, which could refer to a porosome. Even small, temporary damage to the integrity of the cell membrane puts the cell at immediate and great risk of death.
Evil endoplasmic reticulum Not a real term. No No A humorous twist on the different types of actual endoplasmic reticula, implying a malevolent version.
Golgi Camillo Golgi (1843–1926) was an Italian biologist and pathologist who discovered the Golgi apparatus; known also for his works on the central nervous system. Yes No The real Golgi was not and is not a tiny alien being who merged with our cells, as the comic and title text imply.
Golgi apparatus A complex of vesicles and folded membranes involved in secretion and intracellular transport. Yes Yes Actual cell organelle, which takes polypeptide chains from the rough endoplasmic reticulum (carried via transport vesicle) and processes them into their ultimate protein structure before sending them (via vesicles) to their destination (such as an organelle or outside of the cell).
Human skin The outer covering of the human body. Yes No Skin cells aren't normally inside other cells, but dead skin cell fragments can be inside phagocytes. The label, however, is drawn connected to the outer cell membrane or the extracellular matrix. This may be a reference to the idea that almost everything in the human environment is coated with invisible skin cells.
Hypoallergenic filling Materials that cause relatively fewer allergic reactions. Yes No Consumer product term.
Lithosphere The rigid outer part of the earth, consisting of the crust and upper mantle. Yes No Term from geology; part of the Earth's crust.
Mantle The layer of the earth between the crust and the core. Yes No Misplaced geological term with many other meanings.
Midichlorians Fictional microorganisms in the Star Wars universe, which confer Force sensitivity and thereby Jedi associated powers. No Fictional It's unclear whether George Lucas intended for "midi-chlorians" to be endosymbiotic organelles or internal symbionts. Might also be referring to chromoplasts or nitroplasts
Mitochondria Organelles that generate energy for the cell. Yes Yes Actual cell organelles, widely known as the "powerhouse of the cell."
Natural flavor Flavoring derived from natural sources. Yes Conceivably A common ingredient on labels, usually meaning any substance to add flavor, aroma, or both, other than synthetic chemicals which are referred to as artificial flavors.
Norton AntiVirus A software product designed to protect computers from malware. Yes No Computer viruses and biological viruses are completely different, and systems designed to counter one generally don't work for the other. Many cell types do have antiviral mechanisms, notably the CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) DNA sequences in prokaryotes, which resist viral (bacteriophage) infection. However, the cell shown is not prokaryotic, since it contains a nucleus.
Nucleolus A small dense spherical structure in the nucleus of a cell during interphase. Yes Yes Actual cell organelle, involved in ribosome production.
Nucleoloulous Not a real term. No No A humorous continuation of the terms "nucleus" and "nucleolus."
Nucleus The central and most important part of an object, forming the basis for its activity and growth. Yes Yes Actual cell organelle which houses genetic material.
Nucleons Protons and neutrons in the nucleus of an atom. Yes No The depicted circles are far too big to be actual nucleons.
O-ring A mechanical gasket in the shape of a torus; used to seal connections. Yes No Engineering term. Both the o-ring and pith are drawn connected to the inner cell membrane.
Pith The central tissue in plants, used for nutrient transport. Yes No Botanical term. See immediately above.
Pleiades A cluster of stars in the constellation Taurus. Yes No Even a single star is far too big to fit in a cell.
Rough endoplasmic reticulum Endoplasmic reticulum with ribosomes attached, involved in protein synthesis. Yes Yes Actual cell organelle. "Rough" refers to the presence of ribosomes covering its membrane, which translate messenger RNA into polypeptide chains. Normally the endoplasmic reticulum would wrap around the cell nucleus.
Seeds Plant embryos used for reproduction. Yes No Seeds are multicellular, and sometimes contain small proportions of non-cellular tissue.
Slime A moist, soft, and slippery substance. Yes Conceivably Could refer to the texture and appearance of cytoplasm, but not specific to cells.
Smooth endoplasmic reticulum A network of tubular membranes within the cytoplasm of the cell, involved in the transport of materials. Yes Yes A standard term for the smooth (i.e., not ribosome-covered) portion of the endoplasmic reticulum.
Sticky endoplasmic reticulum Not a real term, although parts of the reticula have sticky pockets.[1] No No Another humorous twist on the actual types of endoplasmic reticula.
Ventricle A chamber of the heart that pumps blood out. Yes No Ventricles are actually part of the body, and they are composed of many cells. Possibly a pun on vesicle (or vacuole), a small membrane-enclosed vessel, such as the transport vesicles that carry polypeptides from the rough endoplasmic reticulum to the Golgi apparatus for processing.
Vitreous humour The clear gel that fills the space between the lens and the retina in the eyeball. Yes No The vitreous humor is in eyes, not cells.
Weak spot A vulnerable point. Yes Conceivably Cell membrane surfaces do indeed vary in strength, often due to the presence of organelles such as ion channel pores or porosomes, both of which can be leveraged by viruses to enter cells.

Transcript

Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.

Cell Organelles

[A cell is shown with the following structures and areas labeled, counter-clockwise from upper left:]

  • Smooth endoplasmic reticulum
  • Lithosphere
  • O-Ring
  • Pith
  • Nucleus
  • Nucleolus
  • Nucleoloulous
  • Nucleons
  • Drain plug
  • Evil endoplasmic reticulum
  • Hypoallergenic filling
  • Weak spot
  • Mitochondria
  • Midichlorians
  • Chloroplasts if you're lucky
  • Human skin
  • Carbonation
  • Golgi
  • Golgi apparatus
  • Norton AntiVirus
  • Sticky endoplasmic reticulum
  • Pleiades
  • Natural flavor
  • Cellophane
  • Rough endoplasmic reticulum

[These labels are inside the cell:]

  • Ventricle
  • Mantle
  • Slime
  • Vitreous humour
  • Seeds


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Rules

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