Chapter 26 Bio

Members of the alveolates are characterized by the presence of:

flattened vesicles under the plasma membrane

Members of which protist group is one of the fossilized deposits in the unique geological formation of the White Cliffs of Dover?

foraminiferans

Which group of protists are unicellular, biflagellate stramenopiles that forms a significant portion of the nanoplankton?

golden algae

Brown algae lack true roots, but have similar structures called ____ that anchor them to the substrate.

holdfasts

Which eukaryotic organelles likely arose from symbiotic relationships between larger cells and bacteria?

mitochondria and chloroplasts

Given the diversity in protist ultrastructure and molecular data, biologists regard the protists as a(n) ____ group, meaning that some are descendants of a common eukaryote ancestor.

paraphyletic

Which protist group are characterized by a multinucleate amoeboid-like feeding form?

plasmodial slime molds

Coralline forms of which group of protists are ecologically important in the formation of coral reefs?

red algae

Which are the symbiotic dinoflagellates, which live in the bodies of marine invertebrates such as corals?

zooxanthellae

You find a unicellular organism that forms lobe-like pseudopodia. When you expose the cells to cAMP, they aggregate into a slug like structure. Based on this information, you correctly conclude that this organism is known as:

Dictyostelium discoideum

Which statement about euglenoids is FALSE?

They have a pellicle

Which statement about radiolarians is FALSE?

They lack silica shells

You find a protist that has a single flagellum surrounded by a collar of microvilli. You correctly conclude that this organism is a(n):

cellular slime mold.

The surface of a Paramecium is covered with thousands of short, hair-like ____.

cilia

Which protist group is characterized by having a micronucleus and a macronucleus?

ciliates

The fossilized form of ____ is used in commercially important products, such as filters, polishes, and insect killer.

diatoms

Which algal group contains individuals that are typically unicellular and form siliceous shells?

diatoms

Members of which group are known to form blooms known as red tides?

dinoflagellates

Which protist groups consists of individuals who often have intracellular shells of interlocking plates?

dinoflagellates

Among the protist groups below, which has organisms that typically move with two or more flagella?

diplomonads

Which protist group contains the organism Trypanosoma, a colorless parasite that can cause African sleeping sickness?

excavates

What commercial product is derived from the processing of red algae?

carrageenan

Which statement best describes the composition of cell walls found in water molds?

Some individuals have cell walls of chitin, and others have cell walls of cellulose.

I am characterized by having a test and axopods. Who am I?

actinopods

Most protists are:

aquatic.