Answer:
B
Explanation:
<em>The correct answer would be that in metaphase 1 twice as many chromosomes line up along the middle of the cell as in metaphase 2.</em>
Metaphase generally involves the formation of the metaphase plate and the alignment of chromosomes at the equator of the cell.
<u>At metaphase I, chromosomes align as homologous pairs as opposed to metaphase II where chromosomes align at the equatorial plate singly. It thus means that twice as many chromosomes line up at the equatorial plate in metaphase I when compared to metaphase II.</u>
The correct option is B.
There is well over a million types of organisms on Earth.
Answer:
Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor
Explanation:
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Microfilaments
Microfilaments are fine, thread-like protein fibers, 3-6 nm in diameter. They are composed predominantly of a contractile protein called actin, which is the most abundant cellular protein. Microfilaments' association with the protein myosin is responsible for muscle contraction. Microfilaments can also carry out cellular movements including gliding, contraction, and cytokinesis.
Microtubules
Microtubules are cylindrical tubes, 20-25 nm in diameter. They are composed of subunits of the protein tubulin--these subunits are termed alpha and beta. Microtubules act as a scaffold to determine cell shape, and provide a set of "tracks" for cell organelles and vesicles to move on. Microtubules also form the spindle fibers for separating chromosomes during mitosis. When arranged in geometric patterns inside flagella and cilia, they are used for locomotion.
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