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Paladinen [302]
3 years ago
12

Animals are totally dependent on plants and microorganisms for nitrogen fixation and nitrate assimilation because animals: A. do

not have the reducing power (NADPH) to fix nitrogen. B. lack the enzyme aminotransferase. C. lack the enzymes to reduce N2 and NO3- to NH4+. D. lack carbamoyl-phosphate synthetase I. E. lack glutamate dehydrogenase.
Biology
1 answer:
ale4655 [162]3 years ago
7 0

Answer:

C. lack the enzymes to reduce N2 and NO3- to NH4+

Explanation:

Nitrogen fixation is a process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) so that can be used in metabolic pathways (e.g. biosynthesis of macromolecules). Nitrogen fixation is performed by Archea and bacteria such as Azotobacter (usually in symbiosis with Leguminosa plants).

Nitrogen assimilation is a process in which organic compounds are made from inorganic nitrogen.

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The nucleotide sequence of a DNA codon is TAG. In an mRNA molecule transcribed from this DNA, the codon has the sequence _______
inna [77]

Answer:

The nucleotide sequence of a DNA codon is TAG. In an mRNA molecule transcribed from this DNA, the codon has the sequence 5'-<u>AUC-3'</u>. In the process of protein synthesis, a transfer RNA pairs with the mRNA codon. The nucleotide sequence of the tRNA anticodon is <u>3'-UAG-5'</u>. The amino acid attached to the tRNA is <u>Isoleucine</u>.

Explanation:

In the process of protein synthesis the mRNA contains the sequence of nucleotides —transcribed from the DNA— that defines the sequence of amino acids that a synthesized protein will have.

Codons are triplets of nitrogenous bases present in mRNA, which encode an amino acid, as well as the start and end of protein synthesis.

Anticodons correspond to triplets of bases present in transfer RNA (tRNA), which correspond with mRNA codons. tRNA is responsible for coupling amino acids to the polypeptide chain being synthesized. In view of this:

<em>- DNA triplet:               TAG</em>

<em>- Codon mRNA:      5'-AUC-3' </em>

<em>- Anticodon tRNA:   3'-UAG-5'</em>

<em>- Amino acid:           Isoleucine</em>

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