In multicellular organisms, the structure of different cell types is adapted to their function. Within these cells there are a number of different organelles, each with a particular function. Table 1.1 contains information about the structure and function of five different types of cell. The table also includes, for each type of cell, one example of a cell organelle that is essential for the function to be carried out. Complete Table 1.1. Table 1.1 [Figure 1.1]
- (a)Complete Table 1.1.[5]
- (b)A tissue is a collection of one or more types of cell, specialised to carry out a particular function. An organ can be considered a structural unit within an organism that: • consists of more than one type of tissue • performs a particular function. The aorta is the main artery of the body. Explain, with reference to its structure and function, whether the aorta may be described as a tissue or an organ.[4]
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Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [1] photosynthesis ; A (absorb light to) synthesise, organic compounds / glucose / starch (from inorganic compounds)
- [1] smooth endoplasmic reticulum ; A SER/smooth ER
- [1] plasma cell; A B-cell / white blood cell / leucocyte / (B-) lymphocyte / agranulocyte R T_lymphocyte / granulocyte / phagocyte / macrophage / neutrophil
- [1] active uptake of nitrates
- [1] rough endoplasmic reticulum ; A RER/rough ER A ribosomes A mitochondrion
- [1] (organ because more than one tissue type)
- [1] three named tissue types ; ;;
- [1] endothelium A squamous epithelium A endothelial cells A epithelial cells
- [1] smooth muscle A smooth muscle cells
- [1] connective tissue
- [1] elastic tissue A elastic fibres R elastin / elastic muscle
- [1] fibrous tissue A collagen A collagen fibres
- [1] nervous tissue A nerve cells
- [1] blood A blood cells only in context of vasa vasorum
- [1] transports/carries / AW, blood; A delivers R pumps blood I provides
- [1] detail; e.g. to tissues / to body cells / to body / away from heart / AW R to lungs
- [1] (blood) is oxygenated / contains oxygen
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