Call 1800-123-2003
User login
Call 1800-123-2003
Our Schools
SabariGiri Residential School
"Smartindia is the best online tool for school students." Ms Deepa Chandran, Principal Anchal
M. G. M. Model School
"Smartindia is one of the best supplementary education tool for school students." Ms Pooja, Principal
Read More
Demo Video
Take a Demo Exam
Ask a Teacher
short note on different parts of cell |
| Plasma Membrane Made up of a phospholipid bilayer Plasma membranes are selectively permeable barriers Substances that can freely pass through: Small, uncharged, polar molecules Water through water channels called aquaporins Hydrophobic molecules O2 Allows the cells to maintain constant internal environment Membrane contain proteins Integral membrane proteins Peripheral membrane proteins Plasma membranes are also important for receiving signals and communication Nucleus Contains the DNA Nucleus is where DNA replication occurs Site of the genetic control of the cell activities Proteins, called histones, and DNA are combined to form chromatin The nucleus is surrounded by the nuclear envelope Nuclear pores direct the passage of molecules Usually the largest organelle Ribosomes Ribosomes are where protein synthesis occurs Appear in both prokaryotes and eukaryotes In eukaryotes: They are attached to the rough ER Located in the cytoplasm Also found inside the mitochondria and chloroplasts Endoplasmic Reticulum Rough ER Ribosomes are present Smooth ER Has no ribosomes Involved in the synthesis of lipids and steroids Involved in the breakdown of toxins, drugs or pesticides Involved in the hydrolysis of glycogen Golgi Apparatus Golgi Apparatus modifies and packages proteins received from the ER into vesicles Cis region Receives vesicles coming from the endoplasmic reticulum Trans region Vesicles will bud off from the Golgi apparatus and onto the plasma membrane Lysosomes Lysosomes are vesicles that orginate from the Golgi apparatus Lysosomes contain digestive enzymes Mitochondria Carry out cellular respiration Chloroplasts Carry out photosynthesis Peroxisomes Break down substances such as hydrogen peroxide Cytoskeleton Supports and maintains the cellular shape Positions the organelles Allows for some types of movement Three parts: Microfilaments Intermediate filaments Microtubules Cell Wall Provide support for the cell Can be found in bacteria, fungi, plants and other types of organisms Centrioles Centrioles are involved in the formation of mitotic spindle Vacuoles Used as storage Store waste products, starch, pigments or even toxic compounds Can provide structural support for plant cells If the central vacuole was filled, then they exert pressure on the cell walls. This pressure is also known as turgor |
