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Lerok [7]
3 years ago
8

What is the significance of the evolution of Hox gene clusters during vertebrate evolution?

Biology
1 answer:
AlexFokin [52]3 years ago
5 0

Answer:

Duplication of Hox genes made increased morphological complexity possible.

Explanation:

  • The hox gene cluster consists of a group of related genes that function to controls the basic body plan of an embryo and also define the head to the tail axis.
  • These are mainly responsible for ensuring the correct position of al the structures in the body.
  • Since the anterior-posterior axis all the vertebrates are established by these hox genes this points out to the fact that common information is needed amongst all he vertebrates to define the various morphological variations that occurred.
  • The hox genes have shown duplication in the course of evolution and they have undergone a four-fold duplication which has led to the generation fo different structures in the various organism and is thus responsible for the increased morphological complexity.
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From a chemical view, how is an amino acid is being recognized by its specific aminoacyl tRNA synthetase?
hammer [34]

During translation, rRNA and tRNA read mRNA in 5´ to 3´ direction. According to the codons being readen, tRNA transfers the correct amino acids to build the polypeptide chain. A codon is a short sequence of three nucleotides that store the genetic information for the aminoacids´ assembly.

Each tRNA has two important sites. One of them that couples with the codon of the mRNA molecule, named anticodon. The other site couples with an amino acid through the action of the aminoacyl-tRNA synthase enzyme. The whole complex, amino acid + enzyme + tRNA is named aminoacyl-tRNA.        

Each tRNA is recognized by a specific aminoacyl-tRNA synthase enzyme. The enzyme is also capable of recognizing a specific amino acid. Let us say, for instance, that <em>tRNA is specific for phenylalanine.</em> The molecule is attached to the <em>enzyme that is specific for that tRNA(Phe)</em>. Then, when the enzyme and tRNA(Phe) are together, they get to <em>find phenylalanine</em>. The <em>enzyme links the aminoacid to the RNA</em>. Once the whole complex is formed, the <em>tRNA gets to pair its anticodon with the mRNA codon</em>. This is,

  1. Recognition of enzyme and the specific tRNA(aa) ⇒ aa being aminoacid
  2. Recognition of enzyme and the specific aminoacid
  3. Linkage of the aminoacid to RNA by the enzyme action
  4. Pairing of tRNA anticodon to mRNA codon.

Considering that there are twenty amino acids available, there are also twenty complexes of aminoacyl-tRNA, one for each amino acid. Each of the mRNA codons represents one of the 20 amino acids used to build the protein. Each amino acid can be codified by more than one codon. Of the total 64 codons, 61 codify amino acids, and one is a start codon. The left three codons are stopping translation points.

tRNA decodes genetic information from the nucleotidic sequence in the mRNA molecule and allows amino acids to align composing the new protein.  

Once the new peptidic link joins, placing together the new amino acid to the growing peptidic chain, the binding between the amino acid and the tRNA molecule breaks. The tRNA is now free to join another amino acid and repeat the cycle.

In conclusion, a specific aminoacyl-tRNA synthase enzyme recognizes a tRNA, which is also specific for a certain amino acid. When together, the enzyme recognizes the amino acid and links it to the RNA. The whole complex is known as aminoacyl-tRNA. Once the tRNA is joined to its amino acid, it gets to pair a codon of mRNA to add that amino acid to the new synthesizing protein.

6 0
3 years ago
Behavioral scientists that investigate and explain how factors such as genetics, neurobiology, and hormonal responses can influe
Vika [28.1K]

Answer:

Behavioral scientists that investigate and explain how factors such as genetics, neurobiology, and hormonal responses can influence psychopathology are using a <u>biological</u> perspective.

Explanation:

The biological perspective focuses on the effects of the body on behavior, feelings and thoughts. The study of the biological bases of behavior is a link between two disciplines: psychology and biology. In this sense, the biological perspective implies the study of the behavior and mental processes of the individuals attending to their biological components. The biological perspective, also called neurophysiological, assumes that the mental disorder is a disease, just like any other physical illness and that psychopathological alterations are caused by biological abnormalities, such alterations can be the result of genetic factors, metabolic or hormonal disorders, physical trauma among others. The alteration of the brain is the primary cause of the abnormal behavior.

4 0
3 years ago
Another term(not an animal) that can be used to describe a 2nd level consumer is ...
alexgriva [62]
Secondary consumer

(In detail) A secondary consumer eats the primary consumers while the primary eats the producers. Primary consumers are herbivores while secondary consumers can be omnivores and carnivores.
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By keeping food cold, the growth of microorganisms is:
NISA [10]

Answer:

they are called growth because you are training them

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A client and her partner are working together to achieve an unmedicated birth. the client's cervix is now dilated to 7 cm, and t
vodomira [7]
The nurse can instruct the husband to encourage her wife to breathe deeply and slowly to alleviate pain and discomfort during contractions. Patterned breathing can help the wife to cope with pain during labor, it will also increase oxygen supply of the mother and the baby too. 
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