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Irina-Kira [14]
3 years ago
13

Someone please help me I’m so confused!!!

Biology
1 answer:
lorasvet [3.4K]3 years ago
6 0

Answer:

Explanation:

Third choice—answer

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How are adenine and guanine alike and different
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They both are constituents of DNA.
Adenine, cytosine, guanine and thymine are the glue that holds together the two sugar-phosphate strands which form the back-bone of DNA. The order in which these bases occur is what stores the information in DNA.
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1. In what ways are Fungi similar to Bacteria? Different? How do they obtain energy? (pg. 109)
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They are similar to plants because they are they’re just the exact same as plants
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The chemical mechanisms used to avoid errors in protein synthesis are different from those used during DNA replication. DNA poly
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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.

5 0
3 years ago
The main difference between a prokaryotes and <br> eukaryotes
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Answer:

Eukaryotes are organisms made out of eukaryotic cells, cells with a membrane-bound nucleus and membrane-bound organelles.

Prokaryotes differ from eukaryotes in that their cells do not contain a membrane-bound nucleus that contains their DNA.

Explanation:

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3 years ago
___________ It is a process in producing garden soil that will remove unwanted particles
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Answer:

Adding organic matter or growing cover crops

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Adding organic matter or growing cover crops  in the form of aged manure to the soil is a process used in producing garden soil and this is because not only will the compost make the land good and fertile it will also makes the garden soil friable unlike the application of fertilizer

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2 years ago
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