Bio unit 3 cell division Flashcards
what is a nucle
houses genetic info (DNA) inside nucleas
what is a ribosomes
where proteins are manufactored
what is a mitochondria
ATP is generated
what are type 3 reasons for cell division
- growth
- repair
- reproduction
what is diffusion
transport mechanism for moving chemicals into/out of cells from an area with a higher concentration into a lower concentration
what is concentraition
amount of substance (solute) present in a given volume of solution
what is osmosis
the movement of fluid, usually water, across a membrane toward an are of high solute concentration (type of diffusion)
when will diffusion/osmosis go wrong
if the cell is to large as both take time and without them the cell cannot function
what is a gamete
a sex cell
explain cell division for growth
- we start as one individual cell, as multicellular organisms grow the #of cells increase
- cells recicve/loose nutrients through diffusion
- diffusion/osmosis take place
explain cell division for repair
- daily you shed millions of skin cells that are replaced quickly (cells divide to heal)
- body replaces red blood cells every two days
-ALL organisms need to repair themselves to survive
explain cell divison for reproduction
asexual: mitosis
- parent cell divides into two daughter cells, each daughter cell has complete set of genetic info identical to its parents, occurs in both single and mutilcullar organsisms
sexual: meiosis
- parents cell divides into two gamete cells, each cell has half of a complete set of genetic info from its parents, two gamete cells (each from unique parent cell) combine to form a new organism, occurs in most mutlicellular organisms
what is the difference between asexual and sexual reproduction
asexual: uniparental, gametes not formed, no fertalization occurs
sexual: bi-parental, gametes are formed, fertalization takes place
