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DaniilM [7]
2 years ago
14

During platelet plug formation, platelets begin to stick to:.

Biology
1 answer:
sashaice [31]2 years ago
6 0

Answer:

During platelet plug formation, platelets begin to stick to: collagen with the assistance of von Willebrand factor. As a platelet plug forms at an injury site platelets become activated and their cytoplasm: degranulates as they release chemicals such as ADP and thromboxane A2.

Explanation:

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Record the stages of meiosis in eukaryotic cells realizing that there are two cell divisions involved, each having their particu
Leya [2.2K]
1.1
Meiosis I
The first meiotic division: diploid → haploid
    Prophase I: Chromosomes condense, nuclear membrane dissolves, homologous chromosomes join and occurs crossing over.
    Metaphase-I: the homologous chromosomes align in the middle of the cell. Spindle fibers from the centrosomes connect to the chromosomes.
    Anaphase -I: Spindle fibers contract and split the homologous chromosomes, moving them to opposite poles of the cell.
    Telophase -I: Chromosomes decondense; cell divides to form two haploid cells.

1.2 Meiosis II
The second division: separates sister chromatids (these chromatids may not be identical due to crossing over in prophase I)

     Prophase II: Chromosomes condense, nuclear membrane dissolves, centrosomes move to opposite poles (perpendicular to before)
    Metaphase-II:  the chromosomes align in the middle of the cell. Spindle fibers from the centrosomes connect to the chromosomes (at the centromere)
    Anaphase-II: Spindle fibers contract and split the sister chromatids, and moves them to opposite poles of the cell.
    Telophase-II: Chromosomes decondense,cells divides again to form another 2 haploid daughter cells. Final: 4 new cells.


2. The differences:
Mitosis:
- has 1 division per cycle
- one cell produces 2 new cells
- the genetic information in the mother-cell and the daughter-cells are the same. ( the number of chromosomes is also the same)
- it occurs in somatic cells
Meiosis:
- two divisions per cycle
- one cell when divides produces 4 new cells
- the new cells have different genetic information. mixes the genetic material from the parent cells
- the number of chromosomes of the daughter cells is half of the mother's.

3. Prokaryotic organisms don't divide through mitosis, they use a different process called binary fission. Only eukaryotic organisms, or those whose cells have a defined nuclei, undergo mitosis. Bacteria, for example, are prokaryotic organisms that use binary fission.

4.
 It can't occur. Cross over is the exchange of DNA between homologous chromosomes.  That will result in recombinant chromosomes during sexual reproduction. It can't occur on different chromosomes because they don't code for the same genes.

5. There are a lot of different theories about that, but it's mostly believed that meiosis must evolve before sexual reproduction. That's because The cell replicates their information first and then divides. Plus the cell does that even though it didn't recombine DNA with another organism (sexual reproduction).

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Many cells produce chemicals called _______, hormone-like substances that impact inflammation and reproduction.
Grace [21]

Answer:

vesicles

Explanation:

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Plate tectonics have caused global climate change in the past. This is because _____.
kupik [55]
The shifting of the plates upset the environment in a negative way and changed the amount of carbon dioxide going into the air.
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3 years ago
Read 2 more answers
1. What strengths and weaknesses of the systems approach and the use of models have been
saveliy_v [14]

Answer and Explanation:

Today, the average proportion of fish production at a global scale used for human consumption is over 75 %. This has led to several disadvantages, such as overexploitation of fish and seafood, but to other advantages, such as aquaculture and economic improvement.

<em>Weaknesses</em>:

  • Overfishing / overexploitation that leads to the significant decline of marine organisms.
  • Noise pollution caused by fishing ships
  • Waste and other pollutants that also increase marine contamination.
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<em>Strengths</em>:

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3 years ago
What percent of fresh water is in lakes, streams, and rivers
Orlov [11]
Around 3-4% is the answer.
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