Unit 5 - Algae and Molds

Unit 5, Chapter 21 and 22

Algae

plant-like protists

quality, temperature, and salinity of the water, contain flagella, tendency to form colonies, and color

what are algae classifed based on?

phyta

what are the classification of algae called?

Chlorophyta

green algae, found on the surface of lakes or ponds, mostly single-celled and prefer to form colonies, contain chlorophyll

Phaeophyta

brown algae, multicellular, contain chlorophyll and fucoxantain, contain long blades and holdfasts

Holdfasts

rootlike appendages in phaeophyta that attach themselves to rocks at the bottom of the water

Fucoxantain

pigment that phaeophyta use to perform photosyntheis that also reflect brown light

they help algae collect as much light as they can from the surface

what do the long blades of phaeophyta do?

Rhodophyta

red algae, live mostly at the bottom of bodies of water, contain phycoerythrin, have brancing filaments

Phycoerythrin

pigment that gives rhodophyta its red color

Branching filaments

long chains of single-celled algae, found in rhodophyta

Diatoms and Dinoflagellates

what are the other two phyta that are used to classify algae?

Diatoms

single-celled algae, known for diversity, glass-like cell walls (silica), release oxygen into the environment, most diverse kind of protist

dinoflagellates

second most diverse protist, cousins of the flagellate protozoa, single-celled, primarily in oceans, typically have two flagella, are known to bloom

Bloom

rapid reproduction of microorganisms, usually due to the presence of many nutrients

Molds

fungus-like protists that have no mouths or openings

flexible and mobile cellulose

what are the mold’s cell walls comprised of?

they can be single-celled and also acellular when many mold cells join together

are mold singlecellular?

Acellular

something that doesn’t contain cells

Spore

a single-celled reproductive unit that can be created sexually or asexually

they produce spores and eat organic material

How do spores reproduce?

Slime molds

molds found in damp environments

it slowly feeds on it, taking in the nutrients through its body

how do single-celled slime molds behave in the presence of food?

they will gather and form a swarm, and then search for food together

how do single-celled slime molds act in the absence of food?

swarm

a collection of slime molds that form to search for food together

they will form one body with many nuclei that are enclosed by a single membrane

what if a slime mold is acellular?

they are mostly harmless because they primarily eat dead organisms

how dangerous are slime molds?

water molds

molds that live in bodies of water and moist soils

they are mostly independent, single-celled organisms

how do water molds differ from slime molds?

they tend to grow filaments, like rhodophyta

what do water molds tend to grow?

they will consume anything, including living matter, making water molds parasitic

what do water molds consume?