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Slav-nsk [51]
3 years ago
9

When you were looking at the different stages of mitosis, why were the chromosomes in so many different positions, rather than i

n one distinct position?
Biology
1 answer:
laila [671]3 years ago
8 0

Answer:

In mitosis cell division, the chromosomes in so many different positions rather than in one distinct position because the cell is going to divide.

Explanation:

Mitosis is a type of cell division in which a single cell is divided into two daughter cells having double number of chromosomes or same chromosomes as that of parent cell. In mitosis, chromosomes changes their place because the cell is divided at the center and we know that chromosomes are present in the centre. For equal distribution of chromosome among daughter cell they move from the centre and reaches to the poles and the cell is divided into two daughter cells. Both daughter cells have chromosomes.

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Which of the following is NOT a part of the oxygen cycle?
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Which is a mechanism for restricting the movement of proteins in the plasma membrane? Choose one or more:
alexgriva [62]

Answer:

The correct answers are option A. "tethering proteins to the cell cortex", B. "using barriers such as tight junctions", C. "tethering proteins to the extracellular matrix", D. "forming a covalent linkage with membrane lipids", E. "tethering proteins to the surface of another cell"

Explanation:

According to the fluid-mosaic model, the components of cell membranes are in constant movement forming a barrier to avoid unwanted exterior component internalization and to avoid the loss of precious internal components. This constant movement could cause that proteins move across the plasma membrane. But, this is avoided by several mechanisms including:

A. Tethering proteins to the cell cortex. The cell cortex is a rigid structure made of actin and actomyosin. Proteins found in the plasma membrane are tethered to this structure to restrict their movement.

B. Using barriers such as tight junctions. Tight junctions are barriers found in epithelia made of claudin and occludin proteins. These barriers are impenetrable, which avoid the movement of proteins in the cell membrane.

C. Tethering proteins to the extracellular matrix. The extracellular matrix is made of several proteins and macromolecules that provide a structural and biochemical support to cells that are nearby. Proteins could be tethered to this rigid structure as well.

D. Forming a covalent linkage with membrane lipids. The proteins in the cell membrane that form a covalent linkage with membrane lipids are known as lipid-anchored proteins, or lipid-linked proteins.

E. Tethering proteins to the surface of another cell. When cell-cell communication take place it is possible that proteins in the cell membrane got tethered to the surface of the other cell.

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The waiting room became the conditioned stimulus.

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