Protists are a _______________ group because they include some but not all decedents of a common ancestor
Protists are a diverse group of organisms that includes all eukaryotes except the ____, _____, and _____.
surrounded by water
The common feature among protists is that they tend to live in environments where they are _________.
plants, fungi, and animals
Biologists study protists because they are intrinsically interesting, they are important medically and ecologically, and they are critical to understanding the evolution of ________________.
Harmful ________ occur when dinoflagellates, toxin-producing protists, reach high densities in an aquatic environment.
Production of organic molecules by protists living in the world's oceans represents almost half of the total ________ that is fixed on Earth.
Diatoms and other small organisms that live near the surface of oceans or lakes and that drift along or swim only short distances are called _______.
The organic compounds produced by phytoplankton are the basis of _____ _____ in freshwater and marine environments.
global carbon cycle
The movement of carbon atoms from carbon dioxide molecules in the atmosphere to organisms in the soil or the ocean and then back to the atmosphere is called the ____________.
Protists play a key role in the global carbon cycle and act as carbon sinks that could help reduce ____________
how many major groups of eukaryotes came to be identified on the basis of diagnostic morphological characteristics
the group Plantae includes the ______, and the group Opisthokonta includes the _____ and ______.
__________ is based on collecting organisms from a habitat and analyzing their DNA without growing larger populations of individuals in laboratory culture
________ has led to the discovery of several new lineages of eukaryotes, tiny protists the size of bacteria.
The ________________ proposes that mitochondria originated when a bacterial cell took up residence inside a eukaryote about 2 billion years ago.
__________ occurs when an organism of one species lives inside an organism of another species.
1. Ingesting packets of food.
2. Absorbing organic molecules directly from the environment.
3. Performing photosynthesis.
protists feed by:
Feeding by engulfing is possible in protists that lack a cell wall.
A flexible membrane and dynamic cytoskeleton give these species the ability to surround and swallow prey with long, fingerlike projections called ________
________________, occurs when nutrients are taken up directly from the environment, across the plasma membrane.
glass-like cell wall
cellulose cell wall
calcium carbonate shell
internal support rod
alveoli that help stiffen the cell
What Morphological Innovations Evolved in Protists?
photosynthesis arose in protists by __________, then spread among lineages via ___________