Which of these must occur during S phase of the cell cycle so that two daughter cells can be produced during M phase?

Answer;
The substance that can enter a cell by diffusion without having to be digested is water.

Explanation;
Diffusion involves the movement of molecules from a region of high concentration to a region of low concentration, down a concentration gradient.
Water is able to diffuse through the cell membrane without being digested since it has small molecules.
One property of cell membrane is semi-permeability; it selectively allows material to enter or leave the cell. Large molecules such as starch , fat and proteins, can not enter the cell due to their size and will need to be digested to small molecules for the to gain access to the cell.

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3 years ago

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Describe the stages of each type of cell reproduction process from a normal patient whose body cells can repair themselves and n

Citrus2011 [14]

The types in which cell divides are:

I. Mitosis: Mitosis is the type of cell division in which the DNA and chromosome number of the daughter cell remains the same as parent cell (2n).

Different stages of mitosis are:

a. Prophase - disappearance of nuclear membrane takes place and chromosome starts to condense.

b. Metaphase - The Chromosome aligns to the equatorial plane and gets attached to the spindle fibre arising from the centrioles through its centromere.

c. Anaphase - The sister chromatids of a chromosome gets separated and starts moving to opposite poles.

d. Telophase - Nuclear membrane reappears and the cells divide.

One example where mitosis takes place is to repair the part of the body where it has got injured.

II. Meiosis: Meiosis is the type of cell reproduction where the daughter cell have half the number of chromosome and DNA content than mother cell. Meiosis takes place in two stages and they are:

i. Meiosis I - It includes following stages:

a. Prophase I - Nuclear membrane disappears and chromosome starts to condense.

b. Metaphase I - The homologous chromosome aligns to the equatorial plane and gets attached to the spindle fibre arising from the centrioles through its centromere.

c. Anaphase I - The homologous chromosome gets separated and starts moving to opposite poles.

d. Telophase I - Nuclear membrane reappears and the cells divide.

Meiosis I leads to the formation of two daughter cells.

ii. Meiosis II - It includes following stages:

a. Prophase II - disappearance of nuclear membrane takes place and chromosome starts to condense

b. Metaphase II - The Chromosome aligns to the equatorial plane and gets attached to the spindle fibre arising from the centrioles through its centromere.

c. Anaphase II - The sister chromatids of a chromosome gets separated and starts moving to opposite poles.

d. Telophase II - Nuclear membrane reappears and the cells divide.

Meiosis II leads to the formation of four daughter cells having haploid number of chromosome.

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4 years ago