Lab 18: Protists
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Protists are eukaryotic organisms that aren't considered ____, ____, or ____.
plants, animals, fungi
Protests are found in ____ terrestrial environments, ____ and ____ systems, and growing within the bodies of other organisms.
damp; marine and freshwater
Protists can live in extreme environments such as hot springs or immense pressure at oceans depths greater than 200 m. Protists encompass more than ________ species.
Protists contain two main subgroups, the animal-like "________" and the plant-like "________".
Class: ________ (diatoms) represent a very large group of unicellular algae present in marine, freshwater, terrestrial, and aerial ecosystems.
Diatoms are a major component of the marine ________, and they represent the base of the food web for many marine organisms.
Marine diatoms, due to their abundance and productivity, are responsible for approximately ____% of the world's carbon fixation.
Some species of diatoms contain toxins, namely ________, responsible for amnesic shellfish poisoning.
Diatoms run the gamut for habitats they occupy, growing as ________, ________, and attached organisms to other substrates
Diatoms: four membranes surround the chloroplasts, and pigments of the chloroplasts include ________, chlorophyll a, and chlorophyll c.
Diatoms divided into three classes based on their cell wall or ________ morphology. Classes include ________, ________, and ________.
frustule; pennates, araphid pennates, and centrics
Class: Phaeophyceae (________) are predominantly marine organisms, with some freshwater representatives. Contains 1500 species, most notably kelps.
The chloroplasts of the brown algae contain chlorophyll a and c, fucoxanthin, several ________, and ________ that give them their brown color.
xanthophylls and carotenes
Phylum: Chlorophyta (________) are primarily marine and freshwater organisms, but some occur on moist surfaces and in soil. Species are multi and unicellular, containing about 7000-8000 species.
Rhodophyta (________) is a primarily marine group, but contains some freshwater representatives. Diverse lineage of 4,000 to 6,000, found in very deep water, have nutritive, medical, pharmaceutical, and industrial uses.
One of the most notable characteristics of red algae is its reproductive biology. ____ (male gametes) are not flagellated and can't move on their own. Fertilization occurs by the chance that the water surrounding the thallus will bring the male gamete in contact with a ____ (female gamete).
Rhodopyta - ____ life cycle
The ________ cells in many groups of the red algae allow for the production of more progeny from a single fertilization event.
Phylum: Dinozoa (________) found in marine and freshwater, a small number have been found in wet snow or sand. Contains about 2000 species. Play a large role in carbon cycling and are primary producers in coastal marine waters.
Toxins, such as ________, are responsible for shellfish poisoning.
Some species of ________ are bioluminescent.
Euglenoids contain about 1000 species and are found in fresh and marine water. Found where there is an abundance of ____ organic matter.
Three large differences between Euglenozoa and Chlorophyta are that euglenoids lack a ________, they store fuel-molecules as ________, and they are ________ (meaning they can exist as autotrophic or heterotrophic). In addition, the cell contains a proteinaceous layer just beneath the plasma membrane, the ________, which is responsible for the organism's euglenoid movement.
cell wall, paramylon, mixotrophic; pellicle
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