Ultrastructure of cells - planning 1.2

Planning sheet for ultrastructure of cells

Desired Results


Essential Question(s)

  • How does the presence of membrane bound organelles benefit eukaryotic cells?
  • How many different organelles are there?
  • Do prokaryotes and eukaryotes share any common organelles?
  • What do we mean by resolution, or resolving power of microscopes?

ToK / NOS / IM

  • Developments in equipment help new discoveries in science.
  • Is there any difference between observations made using sense perception directly and those using technology, e.g. microscopes?
  • Modern ICT has improved international collaboration and communication.

Skills students will have

  • Application: ability to explain how the composition of organelles will be different in cells with different functions, e.g. exocrine gland cells and palisade mesophyll cells.
  • Application: explain how the structure of prokaryotes allows them to divide by binary fission.
  • Skill: Drawing prokaryotic cells (cell wall, plasma membrane, cytoplasm, pili, flagella, 70s ribosomes and nucleoid.) and eukaryotic cells (free 80s ribosomes, rough endoplasmic reticulum (rER), lysosome, Golgi apparatus, mitochondrion and nucleus) based on electron micrographs.
  • Skill: Identification of organelles and deduction of the function of specialized cells.
Assessment Evidence

Completion of worksheets included in the following tasks will give evidence of understanding.

There are quick tests the IB style questions in the lessons on eukaryote cells, prokaryote cells and the cell detective activity. The students will show their understanding of the key concepts about both types of cells by answering these questions.

The activities on mobile phones and the cell detective activity ask students to apply their knowledge in new situation and will help to identify students who have difficulty making comparisons, or distinguishing between cell organelles.

The experimental work on prokaryotes gives students an opportunity to process data and write a simple conclusion and evaluation.

There is also a 'webquest' style investigation to spot errors in images of cells found on the web. Students who have a good grasp of the structure of cells will enjoy this activity.

Learning Activities

Eukaryote Cells and their Organelles

Time: 1h This activity contains range of resources to teach about the structure of eukaryotic cells. An introduction to cell ultrastructure including a student activity sheet with examiner's hints is followed by a short screencast explaining how to draw a eukaryotic cell diagram simply so that it doesn't take too long during the exam. Flashcards help students' learn the organelle labels, followed by some questions including a data based IB style question.

Prokaryote Cell Structure & Function

Time: 1h Students learn how to draw and label a diagram of the ultrastructure of Escherichia coli (E. coli) as an example of a prokaryote. Using a webcast and revision flashcards the teacher has more freedom to assist students individually..

Mobile Phone Bacteria Experiment?

Time: 1h Students takes samples from their mobiles phones and grow prokaryote colonies on agar plates. They investigate the hypothesis that mobiles phones harbour colonies of prokaryotes, and that touch screen smartphones are more hygienic than phones with buttons? This activity is combined with a 'webquest' to perfect prokaryote diagrams.

Cell Detective Activity

Time: 1h A Problem Based Learning activity - to challenge students to compare different types of cells and to outline differences between plant and animal eukaryote cells and prokaryote cells.

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