Cell theory and microscopes Flashcards
what is cell theory ( 3 points)
- all livning organisms are composed of cells that can be unicel or multicellular
- all cells contain genetic information, metabolism and are capable of reproduction
-all cells are produced from other cells through cel division or biogenesis
what is the expiramental method
-we used to think organisms aroused from non living things called spontanious generation or abiogenesis
- this was based on the maggots arising from non living food
-this was disproven by louis pasteur in 1745 through expiramintation
what are cells made of
they are made of organelles smaller components
are organelles alive on their own
no but they are essential to a cells function
what is the function of the nucleas
it contains DNA and controls the activity of the cell
what are stem cells
Stem cells are unspecialized cells that can become different types of specialized cells.
What do specialized cells form when grouped together?
the yform tissues
What do tissues with similar functions form?
organs
What do organs that work together form?
organ systems
What is the correct order from smallest to largest: organ, cell, tissue, organ system?
Cell → Tissue → Organ → Organ System
Can we see all living organisms with the naked eye?
no many are microscopic
do plants and animals make up most living things
No, they represent only a small portion of all living organisms.
describe a prokyrote
- no nucleas
- unicellular
- circular
- naked
- no membrane bound
- smaller ribsomes 70
- binary fission
- 1-5 microm (smaller )
- signle chromosone
describe a eukryote
- nucleas
- bound to protein
- linear
- membrane bound
- 80 ribosomes
- mitosis and meiosis
- chromosones paired
- larger (10 -100 micro m)
who made the first microscope
Hans and Zacharias Janssen in 1595.
wahts an eectron microscope
- illuminates things with beams of electrons rather than light
- views items too small for a microscope
- obtain images of atoms
what is fluerecesnse
-used to show members of the membrane cell in more detail
- can be used to labe cancerous cells
what is dark field microscopy
- method of defracting light in order to view the clear cells better
how do you determine the total magnification of a lense
times the ocular lense by the magnifying power
how do we estimate the specamins size
the field diamiter(micrometers) divided by the fit number
look at and study the calculating parts
pow
what processes do cells organelles permit them
Nutrient intake ● Movement ● Growth ● Response to stimuli ● Gas exchange ● Waste removal ● Reproduction
what contains prokayrotic cells
bacteria and archea
what contains eukroyotes cells
plants, animas, fungi and protists
