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Fourth Level

Biodiversity and interdependence

I understand how animal and plant species depend on each other and how living things are adapted for survival. I can predict the impact of population growth and natural hazards on biodiversity.

SCN 4-01a

Body systems and cells

I can explain how biological actions which take place in response to external and internal changes work to maintain stable body conditions.

SCN 4-12a

Through investigation, I can explain how changes in learned behaviour due to internal and external stimuli are of benefit to the survival of species.

SCN 4-12b

Inheritance

Through investigation, I can compare and contrast how different organisms grow and develop.

SCN 4-14a

Through evaluation of a range of data, I can compare sexual and asexual reproduction and explain their importance for survival of species.

SCN 4-14b

I can use my understanding of how characteristics are inherited to solve simple genetic problems and relate this to my understanding of DNA, genes and chromosomes.

SCN 4-14c

Topical science

I can debate the moral and ethical issues associated with some controversial biological procedures.

SCN 4-13c

Northern Ireland

CCEA AS and A Level Biology

1.5 Cells

Describe the ultrastructure of eukaryotic and prokaryotic cells:

prokaryotic cells (e.g. bacteria) as those without nuclei, mitochondria or endoplasmic reticulum and possessing naked, circular DNA, small ribosomes, possibly plasmids, and a cell wall

eukaryotic cells as those with a membrane-bound nucleus, chromosomes (helical DNA with a histone protein coat), mitochondria, endoplasmic reticulum, ribosomes, Golgi apparatus, vesicles, lysosomes, microtubules.

Understand the structure and function of eukaryotic cell components.

Compare eukaryotic cell structure:

plant cells as protoplasts bordered by an extracellular cellulose cell wall and possessing chloroplasts and vacuole(s); neighbouring cell walls adhered by a middle lamella (a sticky material composed of calcium pectate)

fungal cells as protoplasm (often multinucleate) bounded by an extracellular wall of chitin

animal cells as lacking chloroplasts and a cell wall and possessing centrioles.

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