Please select best possible response 1. Fill in the blanks What is the Rf of a m

Question

Please select best possible response 1. Fill in the blanks What is the Rf of a molecule that has migrated S cm and the solvent front is 10 cm on a. a paper chromatogram? b. Paper chromatography can be used to identify each pigment in plant extracts by its characteristic solvent-matrix system which is a constant for a given pigment in a particular c. What are the three products of the reaction that occurs in plants the presence of CO2 two accessory pigments that play a role in photosynthesis in addition to , and d. Name chlorophyll a and b: (yellow-orange) and- (yellow) . e. Different pigments move at different rates in paper chromatography because of their differential and their characteristic tendency to be adsorbed on the cellulose fibers of the paper. 2. Fill in the blanks The mechanism of cytokinesis in animals: b. In plant cells, the mechanism of cytokinesis includes formation of a partition called a c. Name 4 stages of mitosis in sequential order as they occur d. Region in the cell where metaphase stage chromosomes line up: a. perpendicular to the axis of the spindle apparatus , and 3. Name the stages of mitosis in the following figures Vhat is the difference between anaphase I and anaphase II of MIEOSIS?

Explanation / Answer

1.(a). Rf value = distance travelled by solute(dye or pigment) / distance travelled by solvent.

therefore, Rf value = 5cm/10cm = 0.5cm.

(b). Paper chromatography can be used to identify each pigment in plant extracts by its characteristic Rf value which is constant for agiven pigment in a particular solvent-matrix system.

(c). The three products of the reaction (photosynthesis) are Glucose , OXYGEN , and Water .

(d) the two acccessory pigments that play role in photosynthesis in addition to chlorophyll a and b are : Carotenoids and Xanthophylls .

(e).Different pigments move at different rates in paper chromatography because of their differential solubility in the solvent and their characteristic tendency to be adsorbed on the cellulose fibres of the paper.

2. b. in plant cells the mechanism of cytokinesisincludes formation of partition called a cell plate perpendicular to the axis of spindle apparatus.

c. 1. prophase 2. metaphase 3. anaphase 4. telophase and cytokinesis.

d. Region in a cell where metaphase stage chromosomes line up : Equator of the spindle .

4. difference between anaphase1 and anaphase2 of meiosis : in meiosis1 homologous chromosomes separate to each side of the cell but the centromere remains intact whereas in anaphase2 sister chromatids separate and the centrmere splits into two and leads to two separate chromatids.

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