module 2 - 6.4 organisation and specialisation of specialised cells & 6.5 stem cells Flashcards

1
Q

what happens to cells in multicellular organisms for them to become specialised cells?

A

differentiation

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2
Q

what are the levels of organisation in multicellular organisms?

A
  1. specialised cells
  2. tissues
  3. organs
  4. organ systems
  5. organism
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3
Q

what are tissues?

A

collection of 1 or more types of specialised cells, tissue is adapted to perform particular function

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4
Q

what are organs?

A

a collection of tissues that are adapted to perform a particular function

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5
Q

what are organ systems?

A

a collection of organs that are adapted to perform a major function

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6
Q

what is the process of making specialised/ differentiated cells called?

A

differentiation

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7
Q

what do all animal, plant and fungal cells begin as?

A

undifferentiated cells - potential to differentiate into any specialised cells

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8
Q

what are undifferentiated cells called?

A

stem cells

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9
Q

what are body cells?

A

all cells in the body except gametes

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10
Q

what do all specialised cells have in common?

A

they have the same genome as the stem cells

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11
Q

why do all specialised cells have the same genome as the stem cells?

A

because they’re produced by mitosis, so some genes are switched on and some off

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12
Q

what can stem cells go through?

A

cell division

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13
Q

why may stem cells go through cell division many times?

A

to give rise to whole lineages of specialised cells

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14
Q

what are stem cells the source of?

A

new cells for growth, repair and changes to the body plan

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15
Q

how controlled is stem cell division?

A

strictly (come dancing)

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16
Q

what is potency?

A

ability of a stem cell to differentiate into specialised cells

17
Q

what is a totipotent stem cell?

A

a stem cell that can differentiate into any specialised cell

18
Q

what is a pluripotent stem cell?

A

stem cell that differentiates into all tissue types (not into extra-embryonic tissues)

19
Q

what is a multipotent stem cell?

A

a stem cell that can only differentiate into the range of specialised cells found in a tissue

20
Q

what type of cell is a zygote?

A

totipotent stem cell

21
Q

what is a blastocyst?

A

a sack of human cells that forms in early pregnancy

22
Q

when the human embryo is a blastocyst, what are the cells and why?

A

cells are pluripotent because they can form 3 germ layers

23
Q

what are the 3 germ layers?

A
  • endoderm
  • mesoderm
  • ectoderm
24
Q

what is the endoderm layer used for?

A
  • interior stomach lining
  • gastrointestinal tract
  • lungs
25
what is the mesoderm layer used for?
- muscle - bone - blood - urogenital
26
what is the ectoderm layer used for?
- epidermal tissues - nervous system
27
where are plant stem cells found?
meristems or meristematic tissue
28
where are the meristems/ meristematic tissue?
- shoot and root tips where growth by cell division occurs - also found in vascular bundles between xylem and phloem tissue
29
what is the area called between the xylem and phloem tissue where meristems can be found?
VASCULAR CAMBIUM
30
where do animal stem cells come from?
- embryonic stem cells - tissue or adult stem cells (located in specific areas after birth)