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Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:
The oocytes of some vertebrates get arrested for years or months in:
In a mitotic cycle, the correct sequence of phases is
A parallel beam of fast-moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?
Which one of the following never occurs during mitotic cell division?
Identify the correct statement with regard to G1 phase (Gap 1):
Select the correct sequence of events occurring during Prophase-I of Meiosis-I: (a) Synapsis of homologous chromosomes (b) Crossing over between non-sister chromatids (c) Condensation of chromatin (d) Dissolution of the synaptonemal complex (e) Terminalisation of chiasmata
Among eukaryotes, replication of DNA takes place in:
Archegoniophore is present in:
Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. The time period of rotation of the particle -
Given below is the diagram of a bacteriophage. In which one of the options, all the four parts A, B, C and D are correct?
Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom:
Which of the following statements is wrong for viroids?
Cell wall is absent in:
Which one of the following sets of items are correctly categorised with one exception in it? | | Items | Category | Exception | | :--- | :--- | :--- | :--- | | (a) | Kangaroo, Koala, Wombat | Australian Marsupials | Wombat | | (b) | Plasmodium, Cuscuta, Trypanosoma | Protozoan parasites | Cuscuta | | (c) | Typhoid, Pneumonia, Diphtheria | Bacterial diseases | Diphtheria | | (d) | UAA, UAG, UGA | Stop codons | UAG |
Ion that gives colour to water is:
Infectious proteins are present in:
After karyogamy followed by meiosis, spores are produced exogenously in?
Viroids differ from viruses in having;
Which one of the following is wrong for fungi?