Science Group
Explore subjects and practice MCQs
10
Chapters
1,000
Total MCQs
FBISE Biology
Answer: During prophase the nucleolus disappears and the nuclear membrane breaks down, allowing spindle fibers to reach the chromosomes.
Answer: In anaphase, the centromere splits and sister chromatids are pulled to opposite poles by spindle fibers.
Answer: The splitting of the centromere occurs at the beginning of anaphase, allowing the sister chromatids to separate.
Answer: At metaphase, each replicated chromosome consists of two sister chromatids attached at the centromere.
Answer: Anaphase begins when the centromere divides, after which sister chromatids separate and move toward opposite poles.
Answer: In telophase, the chromosomes have reached the poles and begin to uncoil back into chromatin.
Answer: During telophase the nuclear membrane reforms and the nucleolus reappears in each daughter nucleus.
Answer: Cytokinesis is the division of the cytoplasm, which usually follows nuclear division (karyokinesis).
Answer: Karyokinesis refers to the division of the nucleus, which is followed by cytokinesis, the division of the cytoplasm.
Answer: Mitosis maintains the chromosome number, so each pole receives the full diploid set of 8 chromosomes.
Answer: In animal cells, a cleavage furrow forms at the equator and deepens until the cell divides into two.
Answer: Plant cells divide by forming a cell plate at the equator, which grows outward and becomes the new cell wall.
Answer: Vesicles from the Golgi apparatus fuse at the equator to form the cell plate in plant cells.
Answer: A ring of actin microfilaments contracts beneath the cell membrane, pinching the cell into two.
Answer: The rigid cell wall of plant cells prevents pinching, so they divide by forming a cell plate from the centre outward.
Answer: Karyokinesis (nuclear division) occurs first, followed by cytokinesis (cytoplasmic division).
Answer: Centrioles are found in animal cells, where they help organize spindle fibers during division.
Answer: Plant cells lack centrioles; their spindle fibers are formed without them.
Answer: Plant cells lack centrioles, which are present in animal cells and take part in spindle formation.
Answer: Without centrioles, plant cells use other microtubule organizing centers to form the spindle during division.