How does Archaeplastida move?
Volvox colonies contain 500 to 60,000 cells, each with two flagella, contained within a hollow, spherical matrix composed of a gelatinous glycoprotein secretion. Individual cells in a Volvox colony move in a coordinated fashion and are interconnected by cytoplasmic bridges.
What supergroup does Archaeplastida belong to?
Archaeplastida. Red algae and green algae are included in the supergroup Archaeplastida. It was from a common ancestor of these protists that the land plants evolved, since their closest relatives are found in this group.
What are the characteristics of Archaeplastida?
One of the fundamental and distinctive features of the members of Archaeplastida is the presence of the chloroplasts. They also lack centrioles and have mitochondria. They also have a cell wall and cellulose. The food produced from photosynthesis is stored in the form of starch.
What is the unifying characteristic of the Archaeplastida supergroup?
The cells of the Archaeplastida typically lack centrioles and have mitochondria with flat cristae. They usually have a cell wall that contains cellulose, and food is stored in the form of starch. However, these characteristics are also shared with other eukaryotes.
Is Archaeplastida unicellular or multicellular?
The supergroup archaeplastida includes the red algae, green algae and land plants. Each of these three groups have multicellular species and the green and red algae have many single-celled species. The land plants are not considered protists.
Are Archaeplastida monophyletic?
The three groups are usually united under the common name Archaeplastida or Plantae in modern taxonomic classifications, which indicates they are considered monophyletic.
Is Archaeplastida alternation of generations?
Alternation of generations (also known as metagenesis or heterogenesis) is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta that have distinct haploid sexual and diploid asexual stages.
Are Archaeplastida Colonial?
Volvox aureus is a green alga in the supergroup Archaeplastida. This species exists as a colony, consisting of cells immersed in a gel-like matrix and intertwined with each other via hair-like cytoplasmic extensions. True multicellular organisms, such as the sea lettuce, Ulva, are represented among the chlorophytes.
What are examples of Archaeplastida?
Glaucophyte
Green algaeRed algaeRhodophytae
Archaeplastida/Lower classifications
Are Archaeplastida photosynthetic?
Archaeplastida (‘ancient plastids’) are the group containing essentially all of the primary algae (i.e., with plastids of primary endosymbiotic origin – see above), and the great majority of living species in this assemblage are photosynthetic.
What are examples of archaeplastida?
Are archaeplastida photosynthetic?
Who are the members of the Archaeplastida group?
Molecular evidence supports the hypothesis that all Archaeplastida are descendents of an endosymbiotic relationship between a heterotrophic protist and a cyanobacterium. The protist members of the group include the red algae and green algae.
Why are glaucophytes an interesting group of Archaeplastida?
Glaucophytes are a small group of Archaeplastida interesting because their chloroplasts retain remnants of the peptidoglycan cell wall of the ancestral cyanobacterial endosymbiont. Figure 1. Glaucocystis. (credit: By ja:User:NEON / commons:User:NEON_ja – Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=1706641)
How did the kinetoplastid subgroup get its name?
The kinetoplastid subgroup is named after the kinetoplast, a DNA mass carried within the single, oversized mitochondrion possessed by each of these cells. This subgroup includes several parasites, collectively called trypanosomes, which cause devastating human diseases and infect an insect species during a portion of their life cycle.
How are protists classified as a supergroup?
Many of the protist species classified into the supergroup Excavata are asymmetrical, single-celled organisms with a feeding groove “excavated” from one side. This supergroup includes heterotrophic predators, photosynthetic species, and parasites.