What is RNA and what does it do?

1 answer:

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<span> RNA was thought of as little more than a messenger between DNA and proteins, carrying instructions as messenger RNA (mRNA) to build proteins. However, RNA can do far more. It can drive chemical reactions, like proteins, and carries genetic information, like DNA. And because RNA can do both these jobs, most scientists think life as we know it began in an RNA world, without DNA and proteins.</span>

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How is DNA a piece of evidence for evolution

Wittaler [7]

Answer:

DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are. Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.

Explanation:

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3 years ago

Helppppppppppppppppp

olga nikolaevna [1]

For mRNA it’s AUG ACU AGC UGG GGG UAU UAC UUU UAG

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Do the sugars in the apple juice need to be broken down by your digestive system before they can be utilized as an energy source

Georgia [21]

<span>The answer to this question is no, everything that is ingested needs to be metabolised, unless it is a medicine specifically formulated for oral adsorption directly into the bloodstream, or in this instance the energy source is a ketonic monosaccharide. Because it is so small and a simple structure, it can enter the blood barrier directly and the body can then use this as energy.</span>

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3 years ago

Contact lens solution is described as a sterile, buffered, isotonic aqueous solution. Explain the importance of the adjectives b

OLEGan [10]

A contact lens is a lens placed on the cornea of the eye.

Importance of buffers in contact lens products:

Buffers: They aim to keep the pH of the solutions at values between 6.6 and 7.8 in order to maintain the lens parameters and the effectiveness of the solutions. They are made by the combination of an acid and its sodium salt (phosphate and acetate for example). Borate and citrate buffers are used.

Importance of isotonicity in contact lens products:

The solution composed by isotonic saline solution.

Isotonia is expressed by osmolarity or cryoscopic lowering

- 0.236 to 0.446 mOsmoles / l (increases during the day)

- If the osmolarity of the mixture is different from that of the tears, it causes discomfort and irritation

• Increased tear secretion

• Increase the blink frequency

- If hypotonia, entry of water to the epithelial cells, if hypertonia: inverse

- Osmolarity restored 1 or 2 minutes after instillation

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How do ecologists define an ecosystem?

Free_Kalibri [48]

Answer:

An ecosystem consists of all the organisms in an area, the community, and the abiotic factors that influence that community. Ecosystem ecologists often focus on flow of energy and recycling of nutrients. Biosphere: The biosphere is planet Earth, viewed as an ecological system.

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