7-10 In plant cells, cytokinesis is accomplished by the formation of a(n) A) ast

Question

7-10

In plant cells, cytokinesis is accomplished by the formation of a(n) A) aster. B) membrane furrow. C) equatorial plate. D) cell plate. E) spindle. If a cell such as a gamete has half the number of chromosomes as a somatic cell, it is A) haploid. B) diploid. C) polypoid. D) triploid Septation in bacteria refers to A) cracks that develop in the cell wall around the equator of the cell. B) chromosomes that are pulled toward the ends of the cell. C) cytoplasm that forms a cell plate around the middle of the cell. D) microfilaments and microtubules that constrict the cytoplasm. E) a new plasma membrane and cell wall that form between daughter cells. Eukaryotic chromosomes are associated with proteins that are positively charged. These given the name A) albumins. B) antibodies. C) enzymes. D) histamines. E) histones.

Explanation / Answer

1.d plant cells have cell walls cytokinins is cannot proceed with their cleavage furrow so during telophase a cell plate tforms across the cell in the location of metaphase plate and new cell wall forms between the two membranes.

2.a the number of chromosomes in the somatic cells of an organism is 2n whereas in the gametes it is only n so ther are haploid. This is brought in gametes by meoisis.

3.e the plasma membrane begins to pinch in around the entire growth of the cell followed by the formation of new wall so that the aperture of membrane and wall begins to divide the cell this aperture closes and the two identical joined daughter cells are formed the septum still joining the two cells splits down at its centre and the separate the cells this entire division is called septation.

10. E histone for small proteins containing basic amino acids which facilitate binding to the negatively charged DNA molecules. This help to condense the DNA into chromatin. They also play important role in the regulation of gene expression.

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