Question

wuestion 2. In the space below answer the following questions M anos What are the four main microtubule arrays present in plant cells? List these in order in which they occur during coll development. O n s (2 marks) Microtubules exist in an equilibrium state, but with what? Draw an equation that represents this equilibrium (1 mark) a fost carbs pub lo escos Do som How does oryzalin cause microtubule depolymerisation? (1 mark) b o s lab bogata mult mai non solos oldet bare b o ld blo • Disruption of which microtubule array results in the effects documented in Table 2.1? (1 mark) Justify this conclusion. os o b (2 marks) nebo to be the need to see Why are the values at 660 and 730 pm in Table 2.1 not significantly different between the oryzalin treatment and the control? (1 mark)

Answer 1

* Microtubules in plants are highly conserved polar polymers that are the key elements of the eukaryotic cytoskeleton and are essential for various cell functions. = Microtubule arrays in plant cells : 1 cortical transverse array - 2) Preprophase band CPPB) 3) phragmoplas arrays 4) Universat bipolagspindle anay cortical Microtubules - function Regulation of direction of elongation Inter pbase preprophase band (PPB) → Regulation of direction of cell division. Mitotis spindle array chromosome segregation Phase s poepgano phragmoplas array (tokinesis.