October 18-ch20 - Dense slug-like aggregation of cell forms...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
October 18, 2007 Chapter 20 The Amoebozoans Finger shaped pseudopods o Movement o Feeding Aquatic and terrestrial environments Generally lack shells The major groups of amoebozoans are o Amoebas o Slime molds Amoebas o Found in freshwater lakes and ponds o Predators that stalk and engulf prey The slime Molds Distinctly unique lineage amount protists Two phase life cycle o Mobile feeding stage o Forming a fruiting body Two main types o Acellular = plasmodial smile molds o Cellular Composed of a thinly spread cytoplasm with multiple diploid nuclei Feeds on bacteria by engulfing them Can form bright yellow or orange masses Dry conditions or starvation stimulate fruiting body formation o Haploid spores produced Cellular Slime Molds o Life in soil as independent haploid cells o Pseudopodia surround and engulf food (like bacteria) o Food scarcity creates a pseudoplasmodium Individual cells release chemical signal if food is scarce
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Dense slug-like aggregation of cell forms Produced spores to reproduce The red Algae • Multicellular, photosynthetic seaweeds • Bright red to black, due to various pigments, combined with chlorophyll • Found exclusively in marine environments • Very common in deep, clear tropical waters o Can live deeper than other seaweeds • Diversity of forms and uses o Some species deposit calcium carbonate o Some species harvested for foods o Energy captured by red algae important in food chains The green algae • Some form long filamentous chains of cells • Found in clear water • Some form clusters of cells • Mostly microscopic forms • Ulva (sea lettuce) • Are closely related to plants • The earliest plants may have been similar to today’s multicellular green algae...
View Full Document

{[ snackBarMessage ]}

Page1 / 2

October 18-ch20 - Dense slug-like aggregation of cell forms...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online