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GCSE Biology > B2 > Flashcards

B2 Flashcards

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1
Q

what some adaptations of Xylem

A

dead
lignin layer for strengt
physical proccess no energy needed

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2
Q

what are adaptations of the Phloem

A

requires energy (to go in multiple directions)
sieve plates perferated sugar can move between cells
sieve tube no nucleus
companion cells (line the sieve tube) prvides the sieve tube with enegy

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3
Q

what are the stages in the cell cycle

A

growth and DNA replication
mitosis
cytokinesis

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4
Q

What happens in DNA

A

Copies chromasomes
DNA unzips complimentary bases line up
forms DNA base pairs
when strand is complete two identicle strands of DNA

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5
Q

What are the phases in Mitosis (explain)

A

Prophase - nuclear envelope breaks

Metaphase - chromasomes line up along the equator

Anaphase - Chromasomes move to opposite ends of the cell

Telophase - nuclear envelope reforms

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6
Q

What is cytokinesis

A

after Anaphase cell membrane pinches inwards (separates the two daughter nuclei)

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GCSE Biology (9 decks)

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