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Gemiola [76]
3 years ago
13

Question 1

Biology
1 answer:
gtnhenbr [62]3 years ago
8 0

Answer: 1.chromosomes, 2. Histones, 3. prokaryotes have one chromosome, 4. A sugar phosphate backbone with nitogen bases in the middle. 5. Chromatin

Explanation: Chromatin

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it is often useful for scientists to study a population of cells that are all at the same stage of the cell cycle. for example,
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It is often useful for scientists to study a population of cells that are all at the same stage of the cell cycle.

<h3>Why the discovery of cyclins and cdks was enabled?</h3>

The discovery of cyclins and cdks was enabled by studying frog eggs that divided synchronously after fertilization; extracts from the embryos were thus representative of the cell-cycle stage at which the extract was made.

Researchers have devised means to synchronize asynchronous populations of cultured cells. for example, serum starvation deprives cells of mitogens and blocks cells in the g0/g1 phase of the cell cycle.

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The pyramid is not shaped like a typical pyramid, because the bottom should be bigger and getting smaller on top.

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Which system is the digestive system least connected to?
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Integumentary is least connected to the Digestive system

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A spectacular marine animal has a network of glassy spicules that forms a sac-like structure. This animal does not have true tis
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Answer:

Sponges use <em><u>choanocytes</u></em> or <em><u>flagellated channels</u></em> to get nutrients from the feeding cells to other parts of their body.

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Sponges are marine animals with a sac-shaped body. The epidermis is composed of polygonal flat cells called pinacocytes and pores protected by porocytes. Under the epidermis, there is a protein matrix called mesenchyme, which is composed of spicules and <em><u>amibocytes</u></em>. By the interior side of the sponge, there are the<em><u> choanocytes</u></em>. These are ovoid cells that can be shaping the spongocoele (internal cavity of the sponge), with an extreme attached to the mesenchyme and the other extreme projected to the spongocoele, or can be grouped in spaces called <em><u>flagellated channels</u></em>.

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Particle size is essential. Only the small ones can get through the flagellated channels, where they get stuck to the choanocytes and are encapsulated by the cells. If the choanocytes are too small, the particle is transferred to the amibocytes for digestion. These last ones also act as food storages. Excrement products are dragged by a water stream.  

 

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