| Date | November 2013 | Marks available | 3 | Reference code | 13N.2.SL.TZ0.2 |
| Level | Standard level | Paper | Paper 2 | Time zone | TZ0 |
| Command term | Label and State | Question number | 2 | Adapted from | N/A |
Question
The diagram shows some of the structures in an animal cell.
(i) Label structures I, II, III and IV.
I.
II.
III.
IV.
(ii) State one function of structure III.
Explain how materials are transported within a cell between structures X and Y.
Markscheme
(i) Award [1] for any two of the following correctly labeled.
I. ribosomes
II. nucleus (do not accept nuclear membrane)
III. mitochondrion
IV. plasma/cell membrane
(ii) ATP production/site of aerobic respiration (do not accept energy production)
(protein) material transported by vesicles;
from rER to Golgi apparatus/complex/body/membrane;
vesicles bud off from rER/fuse with Golgi membrane (due to membrane fluidity);
Do not accept vacuole(s).
Examiners report
(i) Knowledge of basic cell structures usually earned at least one of two marks. Some confused nucleus with nucleolus or mentioned other incorrect organelles.
(ii) This was a discriminating question as most answers lacked detail; ‘energy production’ was too vague (should have been ‘ATP production’) and ‘cell respiration’ was incomplete (should have been aerobic cell respiration).
Sometimes X and Y were incorrect or ignored. A few gave ‘endoplasmic reticulum’ without specifying ‘rough’. Many only mentioned transport by vesicles. Another problem was the use of ‘vacuoles’ instead of vesicles or the wrong direction for vesicle movement.
