unit 3 Flashcards
cells
who was the first person to see dead cells?
Robert Hooke
who was the first person to see living cells?
Anton von Leeuwenhoek
who thought plants are made up of cells?
Matthias Schleiden
who thought animals were made up of cells and then concluded that all organisms were made up of cells?
Theodor Schowann
who thought that all cells come from other cells?
Rudolph Virchow
what is the old cell theory?
- all living things are made of cells
- cells are the basic units of living things
- new cells come from pre-existing cells
true or false: as technologies advanced and new discoveries were made about cells, the cell theory has been modified.
true
what is the modern cell theory?
- all living things are made of cells
- cells are the basic units of organisms
- new cells come from pre-existing cells
- energy flows within cells
- cells contain hereditary information (DNA) that is passed on from cell to cell during cell division
- cells of similar species have the same chemical compositions
what are some new technologies and discoveries allowed for additions to The Cell Theory?
- biochemical studies
- electron microscopes
- DNA structure and technologies
define cell diversity.
cell diversity are different types of cells form different tissues, which perform different jobs in the body.
red blood cells–
are round and flexible to fit through the round blood vessels
muscle cells–
are long and thin to move bones
neurons–
are nervous cells
fat cells–
provide energy storage
the shape of the cell is related to the job (________) of the cell
the missing word is function.
organelles–
cell structures inside cells that specific structures and functions in the cell.
what are the organelles for cellular boundaries and support?
cell wall, plasma or cell membrane, cytoplasm, and cytoskeleton
what type of cells have a cell wall?
plants, bacteria, fungus, and protists
what is the job of the cell wall?
supports, gives structure and protects cells
what types of cells have a cell membrane or plasma membrane?
all of them
what is the job of the cell membrane or plasma membrane?
it control what goes in and out of the cell and is semipermeable; some materials can cross and others cannot
what types of cells have cytoplasm in them?
all of them
what is the job of cytoplasm?
it fills the cell and supports cell processes, has a cytoskeleton that gives the cell its shape, chemical reactions occur, and substances move around in it
what is cytoplasm made of?
its a jelly-like substance containing mostly water
what types of cells have cytoskeleton in them?
all of them
what is the cytoskeleton made of?
proteins
the cytoskeleton is complex in which types of cells?
animal and plant
what is the job of the cytoskeleton?
it helps the movement of vesicles, supports cell division, maintains the cell shape
which oraganelles are for cellular boundaries and support?
cell wall, plasma or cell membrane, cytoplasm, and cytoskeleton
which organelles are for cellular control?
nucleus, DNA (chromosomes), nucleolus, nuclear membrane (envelope)