Cell Cycle (Bengali version note)

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Practice Set I for Biology MCQ

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  1.The patient of this disease exhibit memory loss (particularly for recent events), shortened attention span, disorientation and eventual language loss. (a) Cancer         (b) AIDS               (c) Alzheimers disease          (d) Cystic fibrosis   2. This tumour normally confined to their original location and do not spread to other parts of the body (a) malignant tumour       (b) metastasis            (c) benign tumour            (d) cancer   3.Certain bacteria living in the soil poor in oxygen, convert nitrates into nitrites and then to free nitrogen and such bacteria are termed as (a) nitrogen fixing bacteria                           (b) denitrifying bacteria (c) ammonifying bacteria             ...
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PARASEXUAL CYCLE (Note FOR UG/PG STUDENTS)

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Parasexual cycle                                  Earlier , it was believed that genetic recombination can only be achieved by sexual reproduction but studies on bacteria have shown that it is also possible through alternative mechanism .Such an alternative mechanism was observed for the first time by Pontecorvo & Raper (1952) seen in Aapergillus nidulans . They observed that in this specialized reproductive mechanism, plasmogamy , karyogamy and meiosis do take place but not at specified time or specified points in the life cycle of the fungus .They considered the group as Deuteromycetes or fungi imperfecti and the specialized cycle of reproduction as “Parasexual Cycle “ Mechanism of parasexual cycle: According to pontecorvo (1958) parasexual cycle in Aspergillus nidulans involves the following step ----- (a) Formati...
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Basic types of fungal nutrition (FOR UG/PG STUDENTS)

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  Different modes of nutrition in fungi                      The fungi are chlorophyll less organisms which cannot synthesize their own food unlike green plants. They are so simple in structure that they cannot obtain inorganic food directly from the soil and therefare , they are always dependent for their food on some dead orgainic materials or living beings. The different modes of nutrition in fungi are as follows---- 1. Parasitic mode: Fungi, which obtain food from living organisms are called parasitic fungi. The parasitic fungi absorbe their food material from the living tissue of host. They are quite harmful to their host and cause many serious diseases. Parasitic fungi may be ectoparasite i.e., grow out side the plant body (eg. Erysiphe ); or may be endoparasite i.e., grow inside the plant body (eg. Phytophthora ) parasitic fungi are farther classified as----- (a) Obligat...
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