Tuesday, September 25, 2007

Algae Cell - 09/25/07

Eukaryote (Algae)
Eukaryote - an organism that consists of one or more eukaryotic cells.
Eukaryote Cell - a cell that contains a nucleus and other organelles.


The parts of an algae from top to bottom and their function is as follows:
Cell Wall - protects the Cytoplasmic membrane.

Cytoplasmic Membrane - the very thin, highly flexible, but structurally weak membrane that lies under the wall and surrounds the interior of the cell.

Cytoplasm - the cell interior which consists of a solution of salts, sugars, amino acids, vitamins, and a wide variety of other soluble materials in water. Since the Cytoplasm has a higher solute concentration than the water surrounding the cell, osmosis causes water to pass from outside the cell through the relatively permeable cell wall, continue through the cytoplasmic membrane, and dilute the cytoplasm. This builds up pressure within the cell until it equalizes to the effective osmotic pressure and, if not for the rigidity of the cell wall, the cell would burst. Other chemical compounds necessary for the life of the cell are selectively passed through this membrane and waste products are evacuated through it.

Nucleus - contains most of the genetic material of the cell, and the DNA (deoxyribonucleic acid) molecules exist as linear strands. The DNA is condensed into obvious chromosomes only at the time of nuclear division (mitosis) in most algae; however, the nuclear DNA of the classes Dinophyceae and Euglenophyceae is always condensed.

Nuclear Membrane - has specialized nuclear pores that regulate the movement of molecules into and out of the nucleus.

Nucleolus - within the nucleus are found chromatin and a structure called the nucleolus. Chromatin is DNA in its active form. It consists of DNA looped around histone proteins. The nucleolus is a knot of chromatin. It is the nucleolus that manufactures ribosomes


Mitochondrion - is the site where food molecules are broken down and carbon dioxide, water, and chemical bond energy are released, a process called cellular respiration. Special organelles where respiration takes place. Mitochondria are the cell's power plants, breaking down organic molecules to provide energy.

Ribosomes - serves as the “workbench” during protein synthesis. It provides the site where genetic information, as messenger RNA, is translated into proteins. The ribosome carefully interprets the genetic code of the DNA so that the protein is made exactly to the genetic specifications.


Function:
Chiefly aquatic, eucaryotic one-celled or multicellular plants without true stems, roots and leaves, that are typically autotrophic, photosynthetic, and contain chlorophyll. Algae are not typically found in groundwater. They also may be attached to structures, rocks or other submerged surfaces. They are food for fish and small aquatic animals. Excess algal growths can impart tastes and odors to potable water. Algae produce oxygen during sunlight hours and use oxygen during the night hours.

2 Examples of organisms with algae cell:

1. Ulva (Sea Lettuce) - green alga
2. Padina - brown alga

Questions:

1. Where does respiration take place in an algae cell?
2. What part of the algae cell manufactures ribosomes?
3. What does algae produce during sunlight hours?

24 comments:

Victoria said...

Hi Hi Frances!! soo I'm here to answer your questions...wish me luck :)

1. Where does respiration take place in an algae cell?
***mitochondrion
2. What part of the algae cell manufactures ribosomes?
***the nucleolus
3. What does algae produce during sunlight hours?
***oxygen, then uses it during the night hours

ok...so let me know how i did. LoL see you in class!

Francine said...

Hi fran,,just stopping by to answer questions...
1. Mitochondrin is where respiration takes place in an algae cell.

2. The nucleus is the part of the algae where cells manufacture ribosomes.

3. Oxygen is what produced during sunlight hours.

Saipan Oceans said...

correct me if im wrong.....

Mitochnodrion is the place where respiration takes place in an algae cell.

Nucleolus is the part of the cell that manufactures ribosomes.

And oxygen is produced by algae during sunlight hours.

Thanks!

PALAUAN MONKEY said...

1.Mitochondrion
2.Nucleolus
3.Algae produce oxygen during sunlight hours

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