Biology  by Bradford
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2.10 Origins of Cell Compartmentalization: revision map

The subtopic in the middle and four tasks round it: label a diagram, complete a table, put a process in order and fill 8 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.

Unit 2 practice questionsThe whole Unit 2 map

Topic 2.10

Origins of Cell Compartmentalization

AP Biology ยท Unit 2 Cell Structure and FunctionName

2.10.ABuilding a eukaryotic cell

Number the steps in order.

  1. An ancestral prokaryote's plasma membrane folds inward, forming internal compartments.
  2. In some lineages a photosynthetic prokaryote is engulfed and becomes a chloroplast.
  3. The host engulfs an aerobic prokaryote, which survives inside it.
  4. The folds surround the DNA, forming a nucleus.
  5. The engulfed cell and host depend on each other and it becomes a mitochondrion.

2.10.AOrigins of organelles

OrganelleProbably came fromHow
Mitochondrionan prokaryoteengulfed by a larger host cell and kept
Chloroplasta prokaryoteengulfed later by a cell that already had mitochondria
Nucleus and ERthe cell's own plasma membrane of the membrane around the DNA
Topic 2.10Origins of Cell Compartmentalization

2.10.AEndosymbiosis

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  1. 1
  2. 2
  3. 3
  4. 4

2.10.AEvidence for endosymbiosis

Mitochondria and chloroplasts are thought to be descended from free-living prokaryotes taken inside a host cell. Both have their own DNA, like bacterial chromosomes, and their own ribosomes, which are similar in size to those of bacteria. They divide by a process like binary fission, and each has a double membrane, which fits an engulfed cell with the host's membrane as its outer layer.

Word bank aerobicaerobic prokaryotecircularinfoldingmitochondrionnucleusphotosyntheticphotosynthetic prokaryote

Answer key

Every box on the sheet with its gaps filled in, as the subtopic reads in full.

  1. LabelEndosymbiosis

    1. mitochondrion
    2. nucleus
    3. aerobic prokaryote
    4. photosynthetic prokaryote

  2. GapsEvidence for endosymbiosis

    Mitochondria and chloroplasts are thought to be descended from free-living prokaryotes taken inside a host cell. Both have their own circular DNA, like bacterial chromosomes, and their own ribosomes, which are similar in size to those of bacteria. They divide by a process like binary fission, and each has a double membrane, which fits an engulfed cell with the host's membrane as its outer layer.

  3. TableOrigins of organelles

    OrganelleProbably came fromHow
    Mitochondrionan aerobic prokaryoteengulfed by a larger host cell and kept
    Chloroplasta photosynthetic prokaryoteengulfed later by a cell that already had mitochondria
    Nucleus and ERthe cell's own plasma membraneinfolding of the membrane around the DNA

  4. OrderBuilding a eukaryotic cell

    1. An ancestral prokaryote's plasma membrane folds inward, forming internal compartments.
    2. The folds surround the DNA, forming a nucleus.
    3. The host engulfs an aerobic prokaryote, which survives inside it.
    4. The engulfed cell and host depend on each other and it becomes a mitochondrion.
    5. In some lineages a photosynthetic prokaryote is engulfed and becomes a chloroplast.