Book : Ch. 4 Flashcards
What is a cell?
A cell is the smallest unit that shows the properties of life
What four generalizations make up cell theory?
- Every living organism consists of one or more cells
- The cell is the structural and functional unit of all organisms. A cell is the smallest unit of life, individually alive even as part of a multicelled organism
- All living cells come from a division of other pre-existing cells
- Cells contain hereditary material which they pass on to their offspring during division
What is a eukaryotic cell?
A cell containing a nucleus
What is a prokaryotic cell?
A cell without a nucleus
What is a plasma membrane?
Cells outer membrane
What is a nucleus?
Double membraned sac holding a eukaryotic cells DNA
In prokaryotic cells where is the DNA found?
In a region of cytoplasm called the nucleoid region
What is a cytoplasm?
A semi fluid mixture of water, sugars, ions, and proteins between the plasma membrane and the region of DNA
What are ribosomes?
Structures on which proteins are built and suspended in cytoplasm
What is surface to volume ratio?
A physical relationship
What is a lipid bilayer?
The structural foundation of all cell membranes
What is a cell wall?
A rigid wall surrounding the plasma membrane of nearly all prokaryotes.
What is flagella?
Slender cellular structures used for motion
What is a pili?
Protein filaments that helps cells cling to or move across surfaces
What are biofilms?
Communial living arrangements in which single celled organisms live in shared mass of slime
What does the endoplasmic reticulum do?
Routes and modifies new polypeptide chains and synthesizes lipids
What does a Golgi body do?
Modifies new polypeptide chains and sorts and ships proteins and lipids
What do vesicles do?
Transport, store and digest substances in a cell
What do mitochondrion do?
Make ATP by sugar breakdown
What do chloroplast do?
Make sugars in plants and some Protists
What does a lysosome do?
Intracellular digestion