1. Fill in the blanks with the missing words.
Microbes, or (1) _____________________, represent 60% of the biomass of all life on Earth. Some of them are (2) _____________________ and can cause serious diseases or contaminate (3) _____________________. However, most of them are helpful, because they make about half the (4) _____________________ we breathe. Some soil microbes release (5) _____________________, which is essential to (6) _____________________ growth and emit gases that maintain the composition of the Earth's (7) _____________________. In our bodies, they can help us digest food and maintain our (8) _____________________ system. New (9) _____________________ can originate from them and they can contribute to the production of (10) _____________________.
2. Fill in the blanks with the missing information about the characteristics of cells.
3. Underline the correct information.
1. Prokaryotes have / lack a membrane-bound nucleus.
2. Prokaryotes are single / multi-celled when they exist in colonies.
3. Prokaryotic cells are larger / smaller than eukaryotic cells.
4. Eukaryotic cells have / don’t have a nucleus.
5. Eukaryotic cells contain external / internal membrane-bound structures.
6. Eukaryotic cells reproduce in one / several ways.
4. Label the picture representing the eukaryotic cell and describe it.
