A-LevelBiologyCell structure9700/43 · May/June 2018 · Q915 Marks
Outline the characteristic features of organisms in the domain Eukarya.
- (a)Outline the characteristic features of organisms in the domain Eukarya.[8]
- (b)Discuss the use of assisted reproduction techniques in the conservation of endangered mammal species.[7]
Mark scheme
Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.
- 9(a) eight from:
- 1 nucleus;
- 2 (double) membrane-bound organelles ; A example
- 3 80S ribosomes;
- 4 chloroplasts / mitochondria, have 70S ribosomes ;
- 5 linear DNA;
- 6 DNA associated with, histones / proteins;
- 7 chloroplasts / mitochondria, DNA is circular;
- 8 unicellular, colonial and multicellular ;
- 9 cells divide by mitosis;
- 10 reproduction can be asexual and sexual;
- 11 AVP;
- 9(b) seven from:
- 1 useful for species where reproduction is difficult / AW ;
- 2 example; e.g. from habitat fragmentation / reproductive physiology
- 3 increases the rate of, reproduction / offspring production ;
- 4 IVF ;
- 5 hormone treatment / superovulation ;
- 6 (many) oocytes harvested ;
- 7 (oocytes) mixed with sperm ;
- 8 embryos placed in uterus ;
- 9 surrogacy;
- 10 detail; e.g. use a similar species / non-rare breed
- 11 ref. to portmanteau animal / embryo transfer ;
- 12 AVP; e.g. embryo splitting
- cryopreservation of sperm
- artificial insemination
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