second partial quiz bio Flashcards
the three postulates of cell theory
- all living things are composed of cells
- cells only arise from pre-existing cells
- cells are the smallest unit of life
1655-robert hooke
observed cells of a cork tree through a primitive microscope
1674- antonie van leewenhoek
observed microorganisms with the microscope he built
1838- matthias schleiden
proposed that all plants where made of cells
1839-theodor schwann
proposed that all animals where made of cells
1855-rudolph virchow
proposed that new cells were only created from pre-existing cells
cells is the_____
smallest unit of life
atoms are the______
smallest unit of matter
basic structure of ALL cells:
-plasma (cell) membrane
-genetic material (DNA)
-cytoplasm
the two types of cells
eukaryote and prokaryote
what does not have a prokaryote that a eukaryote does
nucleus
membrane bound organelles (but has a nucleoid region)
where did organelle-containing cells come from?
endosymbiosis
what do prokaryote cells contain?
- plasma membrane
- cell wall
- capsule: gel-like coat coat outside of cell wall
- flagellum: only in some bacteria. (movement)
- fimbriae/pili: hairlike structure, allows reproduction
- ribosomes
what do eukaryote cells contain?
- nucleus: stores and separates DNA from the cytoplasm
- membrane bound organelles
- plasma membrane. located around the cytoplasm, regulates what enters and leaves the cell
- ribosomes: protein synthesis
what cell has plasma (cell) membrane?
BOTH
what cell has nuclear membrane?
only Eukaryote
what cell has DNA?
BOTH
what cell has membrane bound organelles?
only Eukaryote
what cell has ribosomes?
BOTH
what cell has cell wall?
BOTH (eukaryote only in PLANTS)
what cell has reproduction? specify what type if they do
Prokaryote: binary fission
Eukaryote: mitosis/meiosis
structure and function of plasma (cell) membrane
- all cells surrounded with
- semi-permeable
- phospholipid bilayer
barrier that protects the cell and controls what enters and leaves the cell
structure and function of cytoplasm
- the “filling” of the cell
- jelly-like
literal los organelles flotan en ella
structure and function of cytoskeleton
- made up of proteins
provides support
maintains or changes cell shape
secures organelles in position
enables movement of cytoplasm and vesicles
structure and function of the nucleus
- surrounded by a nuclear envelope with pores
- contains: DNA, protein and Nucleolus(production of ribosomes rRNA)
stores genetic information (DNA)
*every cell in an individual contains the same DNA but which genes are turned off depends on its function
structure and function of ribosomes
- 2 structures known as subunits
small: place where mRNA binds and decodes
large: the place where amino acids are included
protein synthesis which is the creation of protein
can be found in the cytoplasm or attached to the ER
structure and function of endoplasmic reticulum
- a network of tubules and flattened sacs
- smooth ER: no ribosomes, after rough ER
function: synthesis of phospholipids - rough ER: close to the nucleus, has ribosomes
function: processing and modification of proteins