It is night time. Cathy walks into her house and puts the light on The bright light makes her pupils go smaller.
This happens very quickly.
The diagram shows Cathy's eyes before she puts the light on.
SVAR
The diagram shows Cathy's eyes after she puts the light on.
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WAKUU
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KRAN
(a)
Cathy's pupils getting smaller is an example of a reflex action.
Write down two things which show that this is a reflex.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.

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explanation:

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