ROUND-UP 1 Fill in the blanks with the missing words. Microbes, or (1) ..........................................., represent 60% essential to (6) ........................................... growth and emit of the biomass of all life on Earth. Some of them are gases that maintain the composition of the Earth s (2) ........................................... and can cause serious diseases (7) ........................................... . In our bodies, they can help us or However, digest food and maintain our (8) ........................................... most of them are helpful, because they make about system. New (9) ........................................... can originate from half the (4) ........................................... we breathe. Some them and they can contribute to the production of soil microbes release (5) ..........................................., which is (10) ........................................... . 2 3 contaminate (3) ........................................... . Fill in the blanks with the missing information about the characteristics of cells. animals (1) ........................................... Eukaryotic cell types Underline the correct information. in (2) ........................................... (3) ........................................... 1. Prokaryotes have/lack a membrane-bound nucleus. algae 2. Prokaryotes are single/multi celled when they exist in colonies. 3. Prokaryotic cells are larger/smaller than eukaryotic cells. bacteria bacteria-like 4. Eukaryotic cells have/don t have a nucleus. Prokaryotic cell types in (4) ........................................... (5) ...........................................- 5. Eukaryotic cells contain external/internal membrane-bound structures. ........................................... algae 6. Eukaryotic cells reproduce in one/several ways. 4 PRODUCTION Label the picture representing the eukaryotic cell and describe it. (1) ............................... (9) ............................... (10) ............................... (3) ............................... (2) ............................... (4) ............................... (8) ............................... (5) ............................... (7) ............................... (6) ............................... 136 MICROBES AND BIOTECHNOLOGY