10.2 What space Algae?

Algae space eukaryotic organisms, which are organisms whose cells contain a nucleus and also other frameworks (organelles) enclosed within membranes. Castle live in moist environments, mainly aquatic, and contain chlorophyll.

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Algae room not terrestrial plants, which have actually 1) true roots, stems, and leaves, 2) vascular (conducting) tissues, such together xylem, and also phloem, and 3) lack of non-reproductive cells in the reproductive structures. Algae are not cyanobacteria. Cyanobacteria are prokaryotes, which absence membrane-bound organelles and have a single circular chromosome. Number 10.1a reflects the cellular composition of blue-algae and also 1b mirrors a micrograph the the cells. The cell has actually a wall surface with a gelatinous coat. Just beneath the cell wall surface is a plasma membrane. Within the cell, there space layers that phycobilisomes, photosynthetic lamellae, ribosomes, protein granules, and also circular DNA recognized as nucleoids. These are common components of growing plants - however, the component we room interested in space lipid droplets, which space oils that have the right to be extracted from the algae.


Cell framework of blue-algae including liquid droplet, new closed (circular DNA), protein granule, ribosome, photosynthetic lamellae, phycobilisomes (cyanosomes), plasma membrane, cabinet wall, gelatinous coat
Credit: TutorVista

Figure 10.1b: Micrograph the blue-algae.
Credit: B.R. Speer

Algae is written of ~ 50% carbon, 10% nitrogen, and also 2% phosphorus. Table 10.3 mirrors the ingredient of miscellaneous algae looking at the percentages of protein, carbohydrates, lipids, and also nucleic acid.

Table 10.3: composition of birds – protein, carbohydrates, lipids, and nucleic acid.SpeciesProteinCarbohydratesLipidsNucleic acid
Scenedesmus obliquus (green alga)50-5610-1712-143-6
Scenedesmus quadricauda47-1.9-
Scenedesmus dimorphus8-1821-5216-40-
Chlamydomonas rheinhardii (green alga)481721-
Chlorella vulgaris (green alga)51-5812-1714-224-5
Chlorella pyrenoidosa57262-
Spirogyra sp.6-2033-6411-21-
Dunaliella bioculata4948-
Dunaliella salina57326-
Euglena gracilis39-6114-1814-20-
Prymnesium parvum28-4525-3322-381-2
Tetraselmis maculata52153-
Porphyridium cruentum (red alga)28-3940-579-14

So what are the attributes of algae?

1. Eukaryotic bio organisms:

As stated above, algae room eukaryotic organisms. The framework of a eukaryote (a common plant cell) is displayed in figure 10.2a. Number 10.2b reflects the cell structure of a prokaryote, a bacterium, one of two teams of the prokaryotes life. Some perform not consider the prokaryotes as true algae since they have a various structure, however most encompass these in the family of algae. There are labels because that the different parts the the organisms, however I will certainly not call for you to recognize this details in detail - it is over there so if you have a desire come look up much more information, friend can. Table 10.4 mirrors a to compare of both these varieties of cells.


Eukaryotic cell includes: A nucleus (Nuclear pore, nuclear envelope, nucleolus), unstable endoplasmic reticulum, ribosomes, smooth absorbent reticulum, small membranous vesicles, filamentous cytoskeleton, plasmodesmata, plasma membrane, cell wall, chloroplasts (thylakoid membrane, strength grain), vacuole (vacuole, tonoplast), mitochondrion (mitochondria), peroxisome, cytoplasm, golgi vesicles, golgi human body (golgi apparatus)
Credit: Eukaryote: native wikipedia.com

Figure 10.2b: Prokaryote schematic structure.
Click for a text summary of number 10.2b.
A Prokaryote cell contains: A nucleoid (circular DNA), Ribosomes, Plasmid, Cytoplasm, plasma membrane, cell wall, Cabsci-ch.orgle, Pili, bacterial flagellum
Table 10.4: comparison of eukaryotic bio cells and prokaryotic cells.--Eukaryotic cellsProkaryotic cellsSizeNuclear regionChromosomeMembrane
Fairly big in sizeVery minute in size
Nuclear products surrounded by a membraneNuclear region (nucleoid) no surrounded by a nuclear membrane
More 보다 one chromosome presentSingle chromosome present
Membrane-bound cell organelles space presentMembrane-bound cell organelles space absent
2. Live in moist environments

These organisms absence a waxy cuticle (the wax in terrestrial plants avoids water loss). There space a wide selection of growth atmospheres for algae. The common conditions because that algae space moist, tropic regions and also they can flourish in marine and freshwater. Freshwater algae thrive in animals, aquatic plants, farm dams, sewage, lakes, rivers, lagoons, snow, mud/sand, and also soil.

3. Save on computer chlorophyll

Algae are largely photosynthetic, favor plants. Castle have 5 kinds of photosynthetic pigments (chlorophyll a, b, c, d, and also f) and also have numerous accessory pigments that space blue, red, brown, and also gold. Chlorophyll is a environment-friendly pigment discovered in nearly all tree algae and also cyanobacteria. The absorbs light and transfers light power to ATP (adenosine triphosphate).

So just how are algae classified?

Algae belong to the Protista kingdom. Number 10.3 shows a schematic of wherein Protista fits with other classifications that Plantae, Animalia, Fungi, Eubacteria, and also Archaebacteria.

Algae can also be classified based upon chlorophyll content. The very first type is chromista. These varieties of birds contain chlorophylls a and also c, and examples of the algae include brown birds (golden-brown algae), kelp, and also diatoms. These materials are a division of Phaeophyta. These types have a habitat on rocky coasts in pleasant zones or open up seas (cold waters). The structure is multicellular and they can prosper up come 50 m long.


Eubacteria (unicellular, prokaryotic)

Archaebacteria (unicellular, prokaryotic)

Protista (eukaryotic, unicellular and also multicellular)

Plantae (multicellular, eukaryotic)

Animalia (multicellular, eukaryotic)

fungi (multicellular, eukaryotic)

Credit: by Hull (Google) , via Wikimedia Commons
Figure 10.4: A phylogenetic tree.
Credit: Phylogenetic Tree indigenous creationwiki.org

Red algae are another type and save chlorophyll a, such as marine algae (seaweed). These organisms space in the department of Rhodophyta, which has over 4000 species. These are few of the oldest eukaryotic organisms on planet (there space 2 billion-year-old fossils). Lock are abundant in tropical, warmth waters. Castle act as food and also habitat for plenty of marine species. The structure ranges from thin films to facility filamentous membranes. These algae have accessory pigments, and the phycobilins (red) mask chlorophyll a. Number 10.5b shows assorted red algae. Dinoflagellates are unicellular protists, and these are linked with red tide and bioluminescence.

Green algae contain chlorophylls a and also b. They space in the division Chlorophyta.

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This is the largest and also most diverse group the algae. It is found mostly in freshwaters and additionally on floor (rocks, trees, and soil). The structures are single cells (Micrasterias), filamentous algae, swarms (Volvox), and leaf-like form (Thalli). Terrestrial plants occurred from a environment-friendly algal ancestor. Both have actually the very same photosynthetic colors (chlorophyll a and b). Some eco-friendly algae have a cell wall surface made the cellulose, comparable to terrestrial plants. Figure 5c shows examples of eco-friendly algae.