A-LevelBiologyCell structure9700/21 · May/June 2017 · Q16 Marks
Answer all the questions. (a) Each of the statements A to D describes a structure found in eukaryotic cells. Identify the structure that is described in each statement.
- AAn organelle that contains 70S ribosomes.[1]
- BA thread-like structure composed of DNA and histone proteins.[1]
- CThe organelle that modifies and packages proteins for secretion.[1]
- DThe structure that synthesises rRNA and combines it with proteins.[1]
- (b)Prokaryotes and plant cells have cell walls. Outline the composition of the cell wall of a prokaryote and the composition of the cell wall of a plant cell to show how they differ.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- A chloroplast / mitochondrion ;
- B chromosome(s) / chromatid / chromatin ;
- C Golgi (body / apparatus / complex);
- D nucleolus ;
- max 1 if only written about prokaryote wall or only about plant wall
- 1 prokaryote cell wall has, peptidoglycan / murein ;
- 2 plant cell wall has, cellulose / polymer of β glucose; I lignin
- 3 AVP; e.g. prokaryote wall is made of chains crossed linked by, peptides / amino acids hydrogen bonds between cellulose molecules (within microfibrils) in plant cell wall A cellulose chains other components such as pectins / hemicelluloses in plant cell walls
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →