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Delvig [45]
2 years ago
6

Someone help me it is very important

Biology
1 answer:
kolbaska11 [484]2 years ago
3 0
Its the first answer
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A. Compare and contrast the development of the dorsal and
lianna [129]

Answer:

The principal difference in development of Dorsoventral axis in deuterostomes and protostomes is something called inversion

Explanation:

In protostomates the neural tube is below the gut and the dorsal vessel is above the gut while in deuterostomates is the oppossite, there is an inversion and now, the neural tube is above the gut and the heart tube is below. In both cases the development is related to the gradient of expression of some genes, where the expresion of one gene supress the formation of one structure in one side of the axis.

In protostomates the TGT-B factor is expressed dorsally and supress neural tube formation and ventrally a sog gene is expressed and supress TGT-F factor allowing neural tube to develop. In deuterostomates, an homolog of TGT-B family gene BMP-4 is expressed ventrally while dorsally BMP inhibitors (sog gene like) are expressed.

Accordingly to some researchers, the first state of the common ancestor of deuterostomates and protostomates had an protostomate-like orientation in dorsoventral axis

7 0
3 years ago
A substance prepared from killed or weakened pathogens that is introduced into the body to stimulate an immune response is known
snow_lady [41]

The hepatitis B and the human papillomavirus (HPV) vaccines are made this way. The vaccine is composed of a protein that resides on the surface of the virus. This strategy can be used when an immune response to one part of the virus (or bacteria) is responsible for protection against disease.Jun 28, 2016

 


3 0
3 years ago
brittle solid dull or shiny poor thermal conductor may conduct electricity ductile The properties listed here should be added to
nadezda [96]
The answer is B) metalloid
7 0
2 years ago
Read 2 more answers
Solve this please<br> What do I writ's in each category?
Ne4ueva [31]

Answer:

mRNA: UUGGACCGGUACCUG

Codon: UUG GAC CGG UAC CUG

Anti-codon: AAC CUG GCC AUG GAU

Amino Acids: Asn-Leu-Ala-Met-Asp

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Through which conversion is energy released?
icang [17]

Answer:

atp to adp

Explanation:

i actully passed this test in science

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