Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
pattern of growth in plants and animals? |
plants - grow continusely - growth in height is mainly due to cell enlargement animals -grow until they reach a finite size ( full growth ) |
|
|
difference between bacteria and plant and animal cells?
|
-bacteria cells are smaller than plant and animal cells
- bacteria cells and animal cells do not contain chloroplasts like plants - bacteria lack a "true" nucleas and mitchondris <-- animal and plant have this |
|
|
how growth happens in plants and animals? |
plants - growth by cell division usually just happens in area of plant called meristems( tips of roots and shoots) animals - growth happens by cell division
|
|
|
how to see cells? |
1) peel to epidermis from inside of onion 2) lay skin flat on microscope slide 3) cover skin with idoine solution to stain like cells 4) place a cover slip over the skin
|
|
|
where can stem cells be found? |
found in early human embroyos bone marrow - only be turned into certain cell types |
|
|
what is differentiation? |
process by which a cell changes to become specilaised for its job - animals cells lose ability to differentiat is lost at early stage - plant cells dont ever lose ability
|
|
|
example of differentiation |
whitre blood cells are good at fighting invaders but cant carry oxygen like red blood cells |
|
|
what are stem cells |
undifferentiated - can develop into different types of cells, tissues organs depending on what instuctions they've given - have ability to turn into any kind of cell at all |
|
|
how can stem cells cure disorders |
blood disorders can be cured by bone marrow transplants - bone marrow contains adult stem cells that turn into new blood cells to replace faulty old ones |
|
|
what is stem cell therapry |
- very early emboyos contain alot of stem cells scientists can extract these cells, and grow them - eventually beable to grow tissues to treat medecal conditions e.g skin cells for skin grafts, nerve cells for brain damage |
|
|
arguments for stem therapy |
embroyos used in research are usually unwanted ones from fertility clinic other theyd be destroyed |
|
|
arguments aginest stem therapy |
human embroyos shouldnt be used for expreriments since each one if a potentional human life curing patients who are already ill, are more important |
