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Creado por hollyemmakerr
hace más de 10 años
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Pregunta | Respuesta |
what are stem cells? | unspecialised/undifferentiated cells that can renew to produce new cells |
where do stem cells come from? | 1. embryos (embryonic stem cells) 2. adult tissue (adult stem cells) |
why do stem cells raise moral issues and concerns? | main criticism=requires the destruction of a fertilised human egg. some argue this is murder |
where does growth occur in animals? | all over the body |
where does growth occur in plants? | the meristems |
what is a plants meristem? | group of undifferentiated plant cells that can divide repeatedly to produce cells that can become any type of plant cell |
the apical meristems are found.. | at the root and shoot tips |
the lateral meristems are found... | in the stem/branch |
what is growth? | an irreversible increase in the dry mass of an organism |
what is differentiation? | the process which an unspecialised cell changes to be able to perform a function as part of a permanent tissue |
what is mitosis? | cell division within a plant. occurs at the meristems |
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