Atlas of plant and animal histology

Choose true or false. Each right answer scores 1, and each wrong answer scores -1. Not answered questions score 0.

1) The extracellular matrix is mainly composed of lipids.

2) All animal tissues show a rather similar amount of extracellular matrix.

3) The most abundant organic molecule in the extracellular matrix of animal tissues is collagen.

4) The most abundant amino acid in collagen proteins is alanine, which is less common in other proteins.

5) Collagen molecules can be organized as lattices.

6) The organization of collagen fibers in nets or fibers depends on the speed of collagen released by the cells.

7) Collagen fibers are elastic.

8) The elastin molecule is a component of the elastic fibers.

9) Elatic fibers are mainly found in bones.

10) Fibrillin isa component of the elastic fibers.

11) Glycosaminoglycans are polysaccharides found in the extracellular matrix.

12) Glycosaminoglycans are hydrophobic molecules; that is, they repel water.

13) Glycosaminoglycans contribute to two tissue properties: withstand mechanical pressures and favor the movement of cells and molecules through tissues.

14) Proteoglycans contain glycosaminoglycans.

15) The most abundant monosaccharide of the cell wall of plant cells is glucose.

16) Cellulose is synthesized in the Golgi apparatus.

17) The orientation of cellulose fibers influences the direction of the plant cell growth.

18) Lipids are the most important molecules that attach the cell to the extracellular matrix.

19) Fibronectins are glycoprotein adhesion molecules anchored to the plasma membrane of cells.

20) Integrins allow the attachment between cells and the extracellular matrix.

21) Integrins can recognize and bind collagen and fibronectin.

22) Cadherins and selectins are proteins that adhere cells to the extracellular matrix.

23) Metalloproteinases are proteins that synthesize molecules of the extracellular matrix.

24) Adhesion complexes are anchoring points between adjoining cells.

25) Tight junctions are established between neighbor cells of the epithelia and dermis.

26) Adherent junctions are anchored to actin filaments.

27) Hemidesmosomes are half of a desmosome.

28) The cell wall of plant cells contains collagen fibers.

29) The basal lamina is an extracellular matrix found between the epithelial cells.

30) The elasticity of bones is partially provided by collagen fibers.