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sweet-ann [11.9K]
3 years ago
9

What are the main characteristics of a vertebrates

Biology
1 answer:
Alecsey [184]3 years ago
4 0
Vertebrates have a back bone. They have living endoskeleton, pharnyx and efficient respiration, advanced nervous system, and paried limbs.
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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.

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

Learn more about  cell cycle on:

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Which of the following is an impact of an increase in motor vehicles in cities?
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B.
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F.ree points 1×1=1 =1​
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Use the information gathered in the A Three Point Test Cross animation to answer the question. Genes H and K are linked and are
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3.5 percent (3.5%)

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In genetics, <em>crossing over</em> or 'recombination' refers to the exchange of genetic material between non-sister chromatids of homologous chromosomes during meiosis I. The map units (m.u.), also known as centimorgans, represent a measure of genetic linkage between genes/<em>loci</em> located on the same chromosome. One map unit (1 m.u.) is equal to a 1 percent chance that two gene/<em>loci</em> (in this case, genes H and K) will be separated during meiosis by recombination. In the example above, it means that among their progeny, 3.5 percent (3.5%) will be recombinant for the two genes (H and K), and 96.5 percent (96.5%) will have the parental combination of these genes.

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<span> HIV can be transmitted only via body fluids like blood, semen, pre-seminal fluid, rectal fluids, vaginal fluids, and breast milk, which means that people usually get or transmit HIV through sexual behaviours and use of the needle. For HIV infection, these fluids must come in direct contact with a mucous membrane or damaged tissue. Another way is to be directly injected into the bloodstream (from a needle for example).</span>

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