Question

identifying simple organisms
a. decide what type of organism each set of statements describes. write bacterium, alga, protozoan, or fungus on the line. some terms can be used more than once.

1. i am a one - celled organism with a nucleus. i can make my own food.

____________________

1. i break down dead matter to get my food. my cells have nuclei and cell walls. ____________________
2. i am a one - celled organism. i do not have a nucleus. ____________________
3. i am a one - celled organism with a nucleus. i am animal - like. ____________________
4. i am a one - celled organism and absorb my food. i have a nucleus.

____________________

1. i am a plantlike organism and live in the ocean. i can make my own food. ____________________

b. replace the underlined term to make the sentence true. write the correct term on the line.

1. the dna of bacteria is found in the nucleus. ____________________
2. algae and protozoa are two types of fungi. ____________________
3. molds belong in the plant kingdom. ____________________
4. mushrooms cannot make their own food because they do not have cell walls. ____________________

Explanation:

1. Algae are one - celled (or multicellular) organisms with a nucleus (they are eukaryotes) and can perform photosynthesis (make their own food).
2. Fungi break down dead matter (they are decomposers). Their cells have nuclei (eukaryotes) and cell walls (made of chitin).
3. Bacteria are one - celled organisms and prokaryotes (no nucleus).
4. Protozoans are one - celled eukaryotes and are animal - like (heterotrophic, can move in some cases).
5. Fungi (some are single - celled, like yeast) are eukaryotes (have a nucleus) and absorb food.
6. Algae are plant - like (can photosynthesize) and many live in the ocean.
7. Bacteria are prokaryotes. Their DNA is in the cytoplasm (in a region called the nucleoid, not in a membrane - bound nucleus).
8. Algae and protozoa are types of protists. Protists are a diverse group of eukaryotes that are not plants, animals, or fungi.
9. Molds are fungi. They belong to the Fungi Kingdom.
10. Mushrooms (fungi) cannot make their own food because they do not have chloroplasts (the organelle for photosynthesis in plants).

Answer:

1. alga
2. fungus
3. bacterium
4. protozoan
5. fungus
6. alga
7. cytoplasm
8. protists
9. Fungi Kingdom
10. chloroplasts