Ch 27 Flashcards
What is the 3rd domain of life
Eukarya
What are the fundamental features that distinguish eukarya from bacteria and archaea
• Most are large, have more organelles and a more extensive cytoskeleton
• A nuclear envelope
Multicellularly evolved multiple times
Asexual and sexual reproduction
Define protist
Any eukaryote that is not a land plant animal or fungus protists are diverse paraphyletic group most are unicellular but some are multicellular
What protist caused the Irish potato famine?
Phytophthora
Define plasmodium
It is a protist tHas has a lifecycle involving both mosquito and human hosts
It starts when a plasmodium infected mosquito takes blood from a human The plasmodium cells enter the human bloodstream replicate asexually
Define primary producers
Species that produce chemical energy by photosynthesis
Plankton
small or microscopic organisms that serve as a food source in aquatic environments
What do photosynthetic protists do?
They take in Co2 to make sugars this makes them primary producers
Food chain
A relatively simple pathway of energy and nutrient flow through a few species such as a different trophic level in an ecosystem may include for example a primary producer a primary consumer secondary consumer and decomposer
Global Carbon cycle
Movement of carbon atoms from carbon dioxide molecules in the atmosphere to organisms on land or the ocean and then back to the atmosphere
Carbon sink
A long term reservoir of carbon
Include sedimentary rocks and petroleum
What do sedimentary rocks come from
Some protists had shells made of calcium carbonate they go down to bottom of ocean and turn into rock
What is petroleum made out of?
The accumulation of dead bacteria, archaea, and protists at the bottom of the ocean
Synapomorphy is
A shared derived trait found in two or more taxa that is present in their most recent common ancestor that but is missing in more distant ancestors
Monophyletic groups are
Evolutionarily unit that includes an ancestor population and all of its descendants but no others also called a clade or lineage