Answer:
(C) Aminoacyl-tRNA synthetases have an additional active site that binds to non-cognate tRNAs. The tRNAs that bind to this second active are hydrolyzed and released from the enzyme.
Explanation:
In case of translation, proof reading is done by aminoacyl-tRNA synthetases only. Aminoacyl-tRNA synthetases have two mechanisms to avoid error during translation which are mentioned as under:
<u>(1) Chemical proof reading:</u> Incorrect amino acids rather than being hydrolyzed in catalytic pocket get hydrolyzed in editing pocket and thus they hardly get attached to tRNA.
For example: For distinguishing similar amino acids like isoleucine and valine, isoleucyl-tRNA synthetase uses a second active site which is meant for only valine not for isoleucine. In this particular site, valine which had entered the enzyme is cleaved away with the help of editing reaction after which the enzyme is well prepared to process isoleucine which is the correct amino acid for this enzyme.
<u>(2) Kinetic proof reading: </u>Even if an incorrect amino acid has entered a particular aminoacyl-tRNA synthetase, it does not cause appropriate conformational change in the enzyme because of which the incorrect amino acid loosens from the enzyme and does not get incorporated.
Note: In this example, only chemical proof reading is mentioned not kinetic proof reading.
The use of chemicals on crops poses known health risks to humans. this statement most support a decision to buy organic produce.
- The agriculture industry has become more industrialized, which has increased the chemical load on the environment.
- Agrochemicals known as pesticides are applied to agricultural fields, public health initiatives, and urban green spaces to protect people and plants from numerous diseases.
- Their side effects, however, can be a significant environmental health risk factor due to their proven capacity to have a wide range of detrimental health and environmental impacts.
- Produce that is organic uses fewer pesticides.
- Because organic food lacks preservatives that extend its shelf life, it is frequently fresher.
- Organic farming typically benefits the environment.
- Animals kept organically are not fed animal byproducts, growth hormones, or antibiotics.
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Answer;
-The most appropriate answer is Lipids
Explanation;
-Lipids is among the four biological biomolecules, the others being proteins, carbohydrates and nucleic acids.
-Lipids are made up of fatty acids and glycerol and are composed of elements carbon, hydrogen, oxygen and they may also contain phosphorus, like in the case of phospholipids which are mainly components of the cell membranes.
-They take two forms, namely; fats and oils. Therefore, the oil form of lipid may be used as lamp oil.
Ÿöu have to add 8 10 times the. You would get 80
To preserve and keep them fresh
