Practice free Cell cycle and Cell Divisions (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which factors are required for growth ?
For cellular growth, it is essential to have an increase in cell mass, duplication of genetic material, and a division process that ensures each daughter cell receives an equal complement of genetic material. This ensures proper cell function and replication.
With how many cell reproduction starts ?
Cell reproduction typically starts with a single cell. This single cell undergoes various stages of the cell cycle to divide and produce new cells. This concept is fundamental in understanding cellular biology and the process of growth and reproduction in organisms.
At the end of which stage does cell enter mitosis ?
The cell enters mitosis at the end of the G2 phase. The G2 phase is the final subphase in interphase, directly preceding mitosis. This is the period during which the cell checks for DNA damage and completes the replication of its DNA, ensuring that everything is in order before it divides.
The sequence in the cell cycle is
The correct sequence of the cell cycle is G1, S, G2, M. In the G1 phase, the cell grows and performs its normal functions. In the S phase, DNA replication occurs. During the G2 phase, the cell prepares for mitosis by producing the proteins and organelles necessary for cell division. Finally, in the M phase, mitosis and cytokinesis occur, resulting in two daughter cells.
Substances that interface with microtubule function interfare with cell division because....
Microtubules are an essential component of the cell's cytoskeleton and play a crucial role during mitosis in the separation of chromosomes. They form the spindle fibers that ensure each daughter cell receives an equal and precise set of chromosomes. Therefore, the correct option is 'Microtubules are involved in precise separate set of chromosomes get into each daughter cells.'
Chromosomes can be counted during :
Chromosomes are most distinctly visible and can be easily counted during metaphase. During this phase, the chromosomes align at the metaphase plate, making it easier to observe and count them. Hence, the correct option is 'Metaphase.'
The nuclear membrane disintegrates and spindle appears at :
The term ‘karyokinesis’ is used for
Karyokinesis refers to the overall changes occurring in the nucleus during cell division. This includes the processes of prophase, metaphase, anaphase, and telophase, where the nucleus divides to form two daughter nuclei.
Which is the longest phase of meitoic division ?
Prophase-I is the longest phase of meiotic division. During this phase, homologous chromosomes pair up and exchange genetic material through a process called crossing over. This phase is crucial for genetic diversity.
At which stage, the homologous chromosomes separate due to repulsion, but are yet held by chiasmata :
In the Diplotene stage of meiosis, homologous chromosomes begin to separate due to repulsion but are still held together by chiasmata, which are the sites where crossing over has occurred.
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