Biology
Cell Cycle and Chromosomes
1,219 Questions
Explore a curated list of questions covering the cell cycle, mitosis, and meiosis. Topics include DNA replication, chromosomal structures, and genetic disorders. This material is essential for students preparing for biology and general science competitive exams.
Cell cycle eventsDNA replicationMeiosis processChromosomal structuresGenetic disorders
Cell Cycle and Chromosomes Questions
A
Correct answer
Explanation
The sex chromosomes in females are XX. in female individuals, there are 22 pairs of autosomes and one pair of sex chromosome (22 pair + XX).
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Chromosome
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Cytokinesis
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Centrosome
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All the above
C
Correct answer
Explanation
The centrosome is an organelle that serves as a microtubule organizing center during cell division.
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It is found in parts of chromosomes containing many genes.
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It is loosely packed in loops of 30-nm fibres.
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It is separated from adjacent heterochromatin by insulators.
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All are correct.
D
Correct answer
Explanation
Euchromatin is a lightly packed form of chromatin (DNA, RNA and protein) that is enriched in genes ,and is often (but not always) under active transcription. Euchromatin comprises the most active portion of the genome within the cell nucleus. 92% of the human genome is euchromatic. All the statements given above are correct.
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1st pair
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2nd pair
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3rd pair
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4th pair
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5th pair
C
Correct answer
Explanation
Third pair chromosome contain homeotic genes.
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genes
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Lipids
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Water
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None of these
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tetraploid
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hexaploid
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diploid
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pentaploid
B
Correct answer
Explanation
T. aestivum is bread wheat and is a hexaploid species.
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Protoplasm divides into two parts.
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Nucleus divides into two parts.
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Cytoplasm divides into two parts.
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None of these
B
Correct answer
Explanation
Karyokinesis is the division of a cell nucleus during mitosis.
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acrocentric
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metacentric
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submentacentric
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telocentric
D
Correct answer
Explanation
A telocentric chromosome's centromere is located at the terminal end of the chromosome.
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Meiotic prophase
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Mitotic prophase
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Amitotic division
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Crossing over
A
Correct answer
Explanation
In mitosis, plectonemic coiling takes place, in which sister chromatids are tightly coiled upon each other and are not easily separable. Paranemic coiling is found in meiosis.
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they lack nuclei
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DNA sequences are redundant
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the nuclei are lobed
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the mitotic apparatus is absent
A
Correct answer
Explanation
The mature mammalian red blood cells are incapable of further division because they lack nuclei.
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one half of the body is male and the other half is female
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right half of the body is normal and left half is like that of a dwarf
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right half of the body is dwarf and the left half is normal
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one half of the body is dwarf and the other half is like that of a giant
A
Correct answer
Explanation
In gynadromorphs, as seen in Drosophila (fruit fly), one half of the body is male and the other half is female.
B
Correct answer
Explanation
The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell.
B
Correct answer
Explanation
Root is the main plant body and it isalways diploid (2n).
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anaphase
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diakinesis
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metaphase
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zygotene
C
Correct answer
Explanation
Chromosomes are smallest in size during metaphase as they are condensed.
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are present only during mitosis
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consist entirely of DNA
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consist of DNA wound around a histone core
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are made of chromosomes
C
Correct answer
Explanation
The nucleosomes consist of DNA wound around a histone core.