ROUND-UP 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. Prokaryotes a membrane-bound nucleus. Prokaryotes are when they exist in colonies. Prokaryotic cells are than eukaryotic cells. Eukaryotic cells a nucleus. Eukaryotic cells contain membrane-bound structures. Eukaryotic cells reproduce in ways. 1. have / lack 2. single / multi-celled 3. larger / smaller 4. have / don’t have 5. external / internal 6. one / several 4. Label the picture representing the eukaryotic cell and describe it.