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Mrrafil [7]
2 years ago
7

During cell division in a zygote, one cell divides and forms a heart cell and another cell divides and forms a brain cell. Which

of the following best describes the process that is taking place a. Zygotation b. Meiosis c. Mitosisd. Fertilization e. None of the above
Biology
1 answer:
Katarina [22]2 years ago
6 0

Answer:

e,

Explanation:

The process is called Embryonic  differentiation. It is the process where  cells of embryo  undergo division to diverse  specialised structures of  tissues and organs during  Embryogeneis (development  of embryo).The differentiated cells are pluoripotent embryonic stem cell.

 The differentiation is important because   different   cell types of specific functions are in the  embryo. In order to  assume their specific  functions for embryo developments and identity, they must be differentiated 'that is  developed and assigned to  perform specific roles.

It is preceded by fertilisation and Cleavage; influenced by the  internal  factors of cells,as well as,  extracellular factors  of the cell medium.

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Why are enzymes necessary? to the rate of decomposition to act as a catalyst in chemical reactions to conserve the stored energy
mario62 [17]
Enzymes acts as a catalyst in chemical reactions to speed up the rate of reaction.

Enzymes are not necessarily needed because substrates can disintegrate on their own, but enzymes are helpful to aid this process.

6 0
2 years ago
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Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
yaroslaw [1]

Answer: The calcium ion binds to troponin, and this slides the tropomyosin rods away from the binding sites.

Explanation:

Contraction and relaxation of muscle cells brings about movements of the body. The contractile myofilament called sarcomeres are bounded at each end by a dense stripe called the Z - line, to which the myosin fibres are attached, and lying in the middle of the sarcomere are the actin filaments, overlapping with the myosin.

When action potential spreads from the nerve along the sarcolemma (muscle cell membrane), it penetrates deep into the muscle cell through the sarcoplasm (cytoplasm of muscle cell), and releases CALCIUM from the intracellular stores.CALCIUM triggers the binding of myosin to the actin filament next to it forming CROSS BRIDGES.

For this to occur, ACTIN BINDING SITE has to be made available. TROPOMYOSIN is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin. The first step in the process of contraction is for calcium ions to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands.

3 0
3 years ago
Why cant you hear in space?
garik1379 [7]
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6 0
3 years ago
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Flower color in the varieties of pea plants studied by Mendel is controlled by alleles at a single locus. A group of peas homozy
VladimirAG [237]

Answer:

Option 1, 0

Explanation:

Complete question

Flower color in the varieties of pea plants studied by Mendel is controlled by alleles at a single locus. A group of peas homozygous for purple flowers is grown in a garden. All flowers are purple, yet there is some variation in the intensity of the purple color. The estimated heritability for this observed variation in flower color would be

  1. 0.
  2. 0.5.
  3. 0.75.
  4. 1.
  5. Cannot be determined without additional information

Solution

Given all the pea plants in the garden are homozygous purple (PP)

If we cross two PP parents, the following offspring will be produces

PP * PP

PP, PP, PP, PP

This means that all offspring are also homozygous purple.

Thus, chances of inheriting variation in the purple color of offspring are negligible. However, the variation in their color can be due to their individual interaction with the variable factors in the environment

Hence, option 1, 0 is correct

6 0
3 years ago
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