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3 years ago

What are the advantages of using artificial blood

2 answers:

8 0

Blood<span> replacements being studied include oxygen-carrying chemicals (such as perfluoro-carbon emulsions) and cell-free hemoglobin-the portion of the red </span>blood <span>cell that carries oxygen. </span>

levacccp [35]3 years ago

6 0

-eliminate risk of contaminated blood

-uses universal O- blood; no clumping

-can be stored at room temperature

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Which of statements is/are true for sexual reproduction in plants?

Yuliya22 [10]

4 fertilization can occur only after pollination

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3 years ago

What was known before Franklin and Wilkins conducted their studies of DNA? Check all that apply. DNA is found in the nucleus of

kvasek [131]

Answer:

The correct answer will be-

1. DNA is found in the nucleus of a cell

2. Organisms store and transmit genetic information

3. Cells contain protein molecules.

Explanation:

The study of DNA started much before the discoveries of Rosalind Franklin and Maurice Wilkins.

Nucleus of cell was discovered by Robert Brown in 1831 but the material present inside the nucleus called "nuclein" (DNA) came from the studies of Johann Friedrich Miescher in 1869.

Proteins as a constituent of cell were discovered by the experimental analysis of Gerhardus Johannes Mulder in 1837.

DNA as a genetic material came from the experimental studies of Frederick Griffith in 1928, Oswald Avery, Maclyn McCarty, and Colin MacLeod in 1944, and Hershey and Chase in 1952.

Franklin and Maurice Wilkins are known for their work on the the structure of DNA as they were able to produce high-resolution X-ray photographs of DNA fibres called Photo 51 in 1952 using X-ray diffraction technique. By 1953 Franklin concluded concluded that DNA shows helical structure with phosphates on outer side.

Thus, 1. DNA is found in the nucleus of a cell

2. Organisms store and transmit genetic information

3. Cells contain protein molecules.

are the correct options.

8 0

3 years ago

Read 2 more answers

If someone add thousands of small fish to a lake, how would the number of big fish change

Lelu [443]

Answer:

The population of big fish would increase.

Explanation:

As small fish increase, more food for bigger fish will increase, so bigger fish will naturally navigate to the lake.

6 0

4 years ago

What important event in animal evolution marks the beginning of the Cambrian period?

Alenkinab [10]

The appearance of fossils would the the answer.

Although there has been some scientific debate about what fossil strata should mark the beginning of this period, the "International Geological Congress" determined that the Cambrian period was approximately 543 million years ago of which the first appearance in the fossil record of worms that made horizontal burrows was discovered.

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4 years ago

Which three statements are true about the energy flow in an ecosystem

Lady_Fox [76]

Ecosystem energy flow. Energy's life moves. The energy cycle is based on the flow of energy in an ecosystem through various trophic levels. The cycling energy and nutrients obtained from various external sources maintain our ecosystem.

The responses are A, B, and E. A) Because the sun provides the entire ecosystem with energy, it is a major source of energy. B) because photosynthesis is the process in which plants convert radiant energy from the sun into chemical energy to form sugar-known glucose. E) I believe because, as it moves throughout the ecosystem, the amount of energy at each trophic level decreases.

I hope this helped!!!

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3 years ago