5.5 Chromosome Structure, Packaging & Special Chromosomes — Test 2

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5.5 Chromosome Structure, Packaging & Special Chromosomes — Test 2

Q1. The term 'chromosome' was coined by:✓ Waldeyer

Q2. Histone proteins associated with eukaryotic DNA are:✓ Basic (positively charged)

Q3. A characteristic property of histone proteins is that they have a:✓ High isoelectric point (pI)

Q4. The histone octamer forming the nucleosome core consists of:✓ Two each of H2A, H2B, H3 and H4

Q5. The length of DNA wrapped around one nucleosome core is approximately:✓ 146 base pairs

Q6. Two identical copies of a replicated chromosome joined at the centromere are called:✓ Sister chromatids

Q7. The protein structure that serves as the attachment site for spindle fibres is the:✓ Kinetochore

Q8. A chromosome with arms of equal length and a centromere in the middle is termed:✓ Metacentric

Q9. A chromosome with arms of unequal length, the centromere lying closer to one end, is:✓ Submetacentric

Q10. An 'L-shaped' chromosome at anaphase is typically:✓ Submetacentric

Q11. A pair of morphologically similar chromosomes carrying the same gene loci are called:✓ Homologous chromosomes

Q12. Which of the following is an allosome?✓ The Y chromosome

Q13. A gene located on the Y chromosome is described as:✓ Holandric

Q14. Polytene chromosomes are formed by:✓ Repeated replication without separation of chromatids (endoreduplication)

Q15. Lampbrush chromosomes are seen at which stage of the amphibian oocyte?✓ Late prophase (diplotene) of meiosis I

Q16. Balbiani rings on polytene chromosomes are sites of active:✓ RNA synthesis (transcription)

Q17. Hypervariable minisatellite DNA in the human genome is found mainly:✓ Near the telomeres

Q18. The inactivated X chromosome (Barr body) in female cells is an example of:✓ Facultative heterochromatin

Q19. The chemical commonly used to induce polyploidy in plants is:✓ Colchicine

Q20. Match each chromosome type with its description and select the correct option.✓ A-ii, B-iv, C-i, D-iii