Section Number Name EXERCISE 2 Protists II Post-Lab Questions 20.1 Phylum Rhodop

Question

Section Number Name EXERCISE 2 Protists II Post-Lab Questions 20.1 Phylum Rhodophyta: Red Algae 1. While wading in the warm salt water off the beaches of the Florida Keys on spring break, you stoop down to look at the feathery alga shown here. (a) What pigment gives this organism its (b) What commercial products are derived from this phylum? 20.2 Phylum Chlorophyta: Green Algae 2. What two characteristics found within the green algae are clues that this group of o related to the land plants than red algae? riganitsiis s more closely 20.3 Phylum Charophyta: Desmids and Stoneworts 3. Your class takes a field trip to a freshwater stream, where you collect the organism shown microscopi- cally here. (a) What is the genus name of this organism? (b) Identify and give the function of the structure within the chloroplast at the end of the leader (line). 20.4 Phylum Amoebozoa: Slime Molds and Amoebas 4. This photomicrograph was taken from a prepared slide of a Describe the mechanism by which it moves from place to place. stained specimen. You observed unstained living specimens in lab.

Explanation / Answer

1) Phycobiliproteins give the red algae their red color. Phycobiliproteins are water-soluble proteins that capture light energy and is passed on to chlorophylls during photosynthesis.

The commercial products - Agar and carrageenan are red algae derived products that are widely used for gelling and thickening purposes in the food and pharmaceutical industries. Human also consume red algae - nori in Japan, gim in Korea and laver in Britain.

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