71. What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under electron microscope?
72. The sequence of events by which a cell duplicates its genome, synthesises the other constituents of the cell and eventually divides is termed
73. A substance which is more than 80% in the cell is
74. DNA synthesis takes place simultaneously on both strands under the action of the enzyme
75. Archaeopteryx is
76. Consider the following statements and choose the correct answer:
1. All living things are composed of cells and their products
2. All cells arise from pre-existing cells
3. All cells are basically alike in chemical composition and metabolic activities
4. The function of an organism as a whole is the outcome of the activities and interactions of the constituent cells
1. All living things are composed of cells and their products
2. All cells arise from pre-existing cells
3. All cells are basically alike in chemical composition and metabolic activities
4. The function of an organism as a whole is the outcome of the activities and interactions of the constituent cells
77. Who among the following first discovered cell?
78. Chiasmata formed along the lengths of chromosomes are called
79. Consider the following statements regarding eukaryotic ribosomes and choose the correct answer:
1. Eukaryotic ribosomes are considerably smaller than that of prokaryotes
2. They contain a larger number of proteins
3. They have four molecules of RNA
4. The RNA-protein ratio is near 1 : 1 in eukaryotic ribosomes
1. Eukaryotic ribosomes are considerably smaller than that of prokaryotes
2. They contain a larger number of proteins
3. They have four molecules of RNA
4. The RNA-protein ratio is near 1 : 1 in eukaryotic ribosomes
80. Nucleoside is composed of
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