20 Figure 11. A mobile antenna horizontal-plane pattern [13]Figure 12. Corner-reflector antennas light bar mounted on the roof ahead of theantenna. 5.3 Corner Reflector An antenna comprised of one or more dipoleelements in front of a corner reflector, calledthe corner-reflector antenna, is illustrated infigure 12.
Cheek cells, being animal cells, do not contain a cell wall as onion â¦ cells do becasue cell walls are found only in plant cells for structure and rigidness. Onion cells, unlike most plant cells, do not have chlorplasts becasue it does not need sunlight for photosynthesis as other plants do.
Plant cells do not have centrioles. Hence, the structure of the poles is different to that of the cells that possess centrioles. The poles of the cells of plants are broader when compared to the cells of animals.This is probably because of the absence of a cellular organelle that is defined to act as a f ocal point.entrioles are made of nine bundles of microtubules, that are arranged in a ring. The centrioles play a major role in cell division. In animal cells the centrioles play a major role in cell division but the plant cells have the ability to reproduce even without the centrioles.