CellPart-I - Two Basic Types of Cells Prokaryotic- bacteria...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Two Basic Types of Cells •Prokaryotic- bacteria –larger than eukaryotic cells –lacks a nucleus but has a nucleiod (a region of coiled DNA) •DNA is in direct contact with rest of cells contents –Cell wall- a rigid complex structure that protects the cell and helps to maintain its shape –Some have a sticky outer coat called a capsule that further protects the cell and helps to adhere the cell to surfaces –Some have projections •Pili- short projections that aid in adhesion •flagella- used to propel through the liquid environment •Eukaryotic- all other forms of life Human Cell Plant Cell Generalized Cell Three parts Plasma (cell) membrane- the limiting membrane that separates the outer from the internal cell environment Cytoplasm- all the cellular contents between the plasma membrane and the nucleus –cytosol- the thick semifluid portion of the cytoplasm Organelles- the highly organized structures in the cytoplasm that are specialized for particular functions. Organelles •Membranous organelles- surrounded by one or two layers of unit membrane –Nucleus –Mitochondria –Lysosomes –Peroxisomes –Endoplasmic reticulum –Golgi complex •Non membranous organelles- not membrane bound –Ribosome –Centrosome –Centrioles –Basal bodies Organelles Provides separate chemical environments for the various specialized reactions of the cell Nucleus •largest structure in the cell •called the control center because it contains the genetic material –chromatin- loosely dispersed DNA associated with protein –chromosomes- condensed DNA strands
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Karyotype Nucleus (cont.) –nuclear contents bound by a membranous sac called a nuclear envelope (double layered membrane) –studded with ribosomes- place of protein synthesis –nuclear pores- provide communication with cytoplasm –continuous with endoplasmic reticulum –contains nucleolus- unenclosed area composed of protein, DNA, where ribosomes are manufactured Endoplasmic Reticulum •a system of membranous flattened sacs (cisterns) dispersed throughout the cytoplasm •Two types- Rough and smooth –Rough endoplasmic reticulum studded with ribosomes on the outer surface makes more membrane and processes secretory proteins manufactured by the ribosomes membrane continuous with the nuclear envelope Endoplasmic Reticulum •Smooth endoplasmic reticulum –network of interconnected tubes void of ribosomes –continuous with rough ER –site of fatty acid, phospholipid, and steroid synthesis in certain cells the enzymes within the smooth ER inactivates or detoxifies various chemicals (i.e., alcohol, pesticides, carcinogens) Ribosome •Small granules composed of ribosomal RNA and protein •sites of protein synthesis •are scattered throughout the cytoplasm and attached to ER •composed of 2 subunits Golgi Complex •a system of stacked flattened sacs (cisterns) with expanded areas at their ends •has golgi vesicles that cluster along the expanded edges of the cisterns
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

Page1 / 7

CellPart-I - Two Basic Types of Cells Prokaryotic- bacteria...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online