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.
Answer:
मैं इसे थोड़ा कुछ हटके तुम्हें बता रही हूं फूड चेन में क्या होता है कि ना जैसे इसमें तुमने फूड वेब के बारे में पूछा है मैं तुम्हें फूड चेन के बारे में बता रही हूं यह इकोसिस्टम का ही एक पाठ होता है तू ट्रेन में जैसे बेस्ट एग्जांपल है कि घास घास खाता है ग्रास है पर को फ्रॉक खाता है फ्रॉक को उसने खाता में कोई गर्ल खाता है जल के बाद वह जो भी चीज खाता है ना तो वह सब चीजें नाड़ी कंपोज हो जाती हैं पूर्व में क्या होता है इंटरकनेक्शन रहता है कुछ चीजों में और जो तुमने डायग्राम भेजा है वह डायग्राम एनसीईआरटी बुक में है क्लास 8 की तो यू कैन डू फॉर द डायग्राम एंड और उसे देखने के बाद अच्छा लगे तो follow us
The earth is divided into four main layers: the solid crust on the outside, the mantel, the outer core and the inner core. out of them, the crust is the thinnest layer of the earth, amounting for less than 1% of our planet's volume. hope this helps!
Answer:
As the human population has grown, the need for more land has caused an increase in the cutting down of forest lands for habitation and farming. The result has been an increase in soil erosion, an increase in species extinction from habitat loss, and a reduction of oxygen supplied by the trees, as well as lower amounts of carbon dioxide being removed from the atmosphere. Industrial and personal use of fossil fuels has dramatically increased the amount of air pollution in the atmosphere while systematically using up the supply of the non-renewable resources such as coal, oil and natural gas
Explanation: Hope this helps! ^^
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