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givi [52]
2 years ago
15

The process of moving toward an area due to chemical signals is called

Biology
1 answer:
Law Incorporation [45]2 years ago
7 0
I believe what you are looking for is Chemotaxis.
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Which statement best explains how sewage systems help fight the spread of disease?A.They carry antibiotics that kill pathogens i
SpyIntel [72]

Answer:

D.They carry human waste to treatment facilities away from cities.

Explanation:

Sewage system is a collection of systems that carries sewage (human waste) from the point it was produced to a place where it'll be treated or recycled.

Since sewage is moved via the use of sewage system, it helps to fight the spread of disease by carrying human waste (sewage) to treatment facilities away from cities.

3 0
3 years ago
What are differences between meiosis and mitosis?
kolezko [41]
Differences Between Mitosis and Meiosis

1. Cell Division

<span><span>Mitosis: A somatic cell divides once. Cytokinesis (the division of the cytoplasm) occurs at the end of telophase. </span><span>Meiosis: A reproductive cell divides twice. Cytokinesis happens at the end of telophase I and telophase II.</span></span>

2. Daughter Cell Number

<span>Mitosis: Two daughter cells are produced. Each cell is diploid containing the same number of chromosomes. </span><span>Meiosis: Four daughter cells are produced. Each cell is haploid containing one-half the number of chromosomes as the original cell.</span>

3. Genetic Composition

<span><span>Mitosis: The resulting daughter cells in mitosis are genetic clones (they are genetically identical). No recombination or crossing over occur. </span><span>Meiosis: The resulting daughter cells contain different combinations of genes. Genetic recombination occurs as a result of the random segregation of homologous chromosomes into different cells and by the process of crossing over (transfer of genes between homologous chromosomes).</span></span>

4. Length of Prophase

<span><span>Mitosis: During the first mitotic stage, known as prophase, chromatincondenses into discrete chromosomes, the nuclear envelope breaks down, and spindle fibers form at opposite poles of the cell. A cell spends less time in prophase of mitosis than a cell in prophase I of meiosis. </span><span>Meiosis: Prophase I consists of five stages and lasts longer than prophase of mitosis. The five stages of meiotic prophase I are leptotene, zygotene, pachytene, diplotene, and diakinesis. These five stages do not occur in mitosis. Genetic recombination and crossing over take place during prophase I.</span></span>

5. Tetrad Formation

<span>Mitosis: Tetrad formation does not occur. </span><span>Meiosis: In prophase I, pairs of homologous chromosomes line up closely together forming what is called a tetrad. A tetrad consists of four chromatids(two sets of sister chromatids).</span>

6. Chromosome Alignment in Metaphase

<span><span>Mitosis: Sister chromatids (duplicated chromosome comprised of two identical chromosomes connected at the centromere region) align at the metaphase plate (a plane that is equally distant from the two cell poles). </span><span>Meiosis: Tetrads (homologous chromosome pairs) align at the metaphase plate in metaphase I.</span></span>

7. Chromosome Separation

<span><span>Mitosis: During anaphase, sister chromatids separate and begin migrating centromere first toward opposite poles of the cell. A separated sister chromatid becomes known as daughter chromosome and is considered a full chromosome. </span><span>Meiosis: Homologous chromosomes migrate toward opposite poles of the cell during anaphase I. Sister chromatids do not separate in anaphase I.</span></span>
5 0
2 years ago
This is a picture of cattle rearing. What do you want to know?
AfilCa [17]

Answer:

I want to know;

  • the length and thickness of the woods used in building.
  • the type of food to feed aside grass.
  • vaccines used.

Explanation:

thank you

7 0
3 years ago
Select the correct answer from each drop-down menu.
Ira Lisetskai [31]

Answer:

Stem cells have the ability to divide <u>through mitosis</u> and produce unspecified cells. Stem cells can be developed into a required tissue because of their ability of <u>differentiation</u>.

Explanation:

A stem cell is a cell that is in an undifferentiated state. This means that it has not specialized in a specific type that carries out a specific function of that tissue, which does not imply that stem cells do not have their own function. The concept of stem cell is due to the ability to originate specialized cells from one or more tissues, depending on the degree of potency or plasticity it has. They are found in all multicellular living organisms. Their main characteristic is that by reproducing through the process of mitosis (they divide into two cells) they can form more stem cells or differentiate, that is, they become specialized cells, in such a way that they are essential for the renewal of cells in different tissues. and to repair them.

5 0
3 years ago
Read 2 more answers
Which event occurs in photosystem I?
DanielleElmas [232]
The answer is D) <span>Electrons are transferred to ferredoxin.

Photosystem I is the part of </span><span>photosynthetic light reactions. It is membrane protein complex which uses light energy to transfer electron from plastocyanin to ferredoxin.</span>
4 0
2 years ago
Read 2 more answers
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