A student was asked to identify a permanent slide of mitosis. He made the following observations. (i) Splitting of centromere and formation of daughter chromatids. (ii) Chromatids are migrating towards the opposite poles. The stage would be
Anaphase
Karyokinesis in mitosis passes through prophase, metaphase, anaphase and telophase, and each stage has visible features that identify it on a slide.
Observation (i): at the onset of anaphase each chromosome arranged at the metaphase plate splits simultaneously at the centromere, and the two daughter chromatids separate.
Observation (ii): the daughter chromatids, now called chromosomes of the future daughter nuclei, migrate towards the two opposite poles, centromere leading and arms trailing.
Both features belong to anaphase. In prophase chromosomes only condense; in metaphase they lie aligned at the equatorial plate with sister chromatids still joined at the centromere; in telophase chromosomes have already reached the poles and decondense as the nuclear envelope reforms.
Anaphase option is correct.
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Cellulose is an important structural component in plants which is made up of
A diploid cell which has 8 chromosomes undergoes meiosis and produces 4 daughter cells. What is the number of chromosomes present in each daughter cell formed at the end of meiosis-I?
The following statements are the steps in the catalytic action of an enzyme. Arrange them in correct sequence.
a) The active site of the enzyme, now in close proximity of the substrate, breaks the chemical bonds of the substrate and the new enzyme product complex is formed.
b) The substrate binds tightly to the enzyme, inducing a change in the active site of the enzyme.
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