-Chloroplast
-Vacuole
-Cell wall
-cell membrane
-Nucleus
-cytoplasm
-mitochondriab. List the structural features of the cell.
-A rigid cell wall that is made of complex carbohydrates and proteins. Cell walls have to be rigid to provide structural support, it also acts as a filtering mechanism.
-Unlike animals, plants do not have a skeletal system that provides support and anchorage to tissues.
-Therefore, the cell wall has to provide the structural stability and regular shape.
c. What are the functions of these organelles?
-Nucleus: It is enclosed in a double membrane. Within the nucleus is the DNA responsible for providing the cell with its unique characteristics. The DNA is similar in every cell of the body, but depending on the specific cell type, some genes may be turned on or off.
-Cytoplasm: This is where chemical reactions in the plant takes place
-Cell Membrane: Every cell is enclosed in a membrane The cell membrane acts as a protective barrier to the uncontrolled flow of water.
-Mitochondria: Mitochondria provide the energy a cell needs to move, divide, produce secretory products, contract - in short, they are the power centers of the cell. They are about the size of bacteria but may have different shapes depending on the cell type.
-Vacuole: A vacuole is a membrane-bound sac that plays roles in intracellular digestion and the release of cellular waste products Vacuoles tend to be large in plant cells and play several roles: storing nutrients and waste products, helping increase cell size during growth. Water collects in cell vacuoles, pressing outward against the cell wall and producing rigidity in the plant. Without sufficient water, turgor pressure drops and the plant wilts.
-Cell Wall (plant cells only): Plant cells have a rigid, protective cell wall The cell wall provides and maintains the shape of these cells and serves as a protective barrier. Fluid collects in the plant cell vacuole and pushes out against the cell wall. This turgor pressure is responsible for the crispness of fresh vegetables.
-Chloroplast (plant cells only): Chloroplasts are specialized organelles found in all higher plant cells. These organelles contain the plant cell's chlorophyll responsible for the plant's green color.
D.Why are these functions of the organelles important to the living cell?
-These functions are important as without these organelles, the plant cell cannot operate properly.
Monday, April 5, 2010
green leaf cell
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I did not know that the vacuole has functions too,like intracellular digestion.
ReplyDeleteI did not know that the vacuole has functions other than making the cell stay together.
ReplyDeleteNow,I know what a plant cell is made up of.
ReplyDeleteONG BING JUE
I did not know that water are collected in cell vacuoles, pressing outward against the cell wall and producing rigidity in the plant. Without sufficient water, turgor pressure drops and the plant wilts.
ReplyDeleteI did not know that the Mitochondria may have different shapes depending on the cell type.
ReplyDeleteI thought that the only role of the vacuole is to give the plant structural support. I did not know that it plays a part in intracellular digestion.
ReplyDeleteI did not know that rigid cell wall that is made of complex carbohydrates and proteins.
ReplyDeleteI did not know the turgor pressure(fluid collected in the cell vacuole and pushes out against the cell wall) is responsible for the crispness of fresh vegetables.
ReplyDeleteSo a plant cell is like our skeleton that is new for me.
ReplyDeleteA plant cell actually acts as a "skeleton". That something I don't know.
ReplyDeletei did not know that the vacuole plays roles in intracellular digestion
ReplyDeleteI have learnt that a plant's cell wall also acts as a filtering mechanism.
ReplyDeleteDaniel
i learnt that vacuole also plays apart intracellular digestion, i oso did'nt know about the tugor pressure too.
ReplyDelete