I think it's probably learned
Some viruses contain both DNA and RNA as their genetic material is NOT true of viruses (option D).
<h3>What is a virus?</h3>
A virus is a non-living entity that needs a suitable host to reproduce its genetic material (DNA or RNA).
Viruses may contain a genetic material composed of other DNA or RNA but not both.
In conclusion, some viruses contain both DNA and RNA as their genetic material is NOT true of viruses (option D).
Learn more about viruses here:
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Answer:
a. It is present at high concentration at the anterior end and low concentration at the posterior end.
Explanation:
One of the ways to define the anterior-posterior axis in Drosophila is by the products of the Bicoid and Nanos genes. The mRNA from the bicoid gene is transcribed by nurse cells. The bicoid mRNA is deposited in the unfertilized egg near its anterior pole. Therefore, the bicoid gene product serves as the anterior morphogen. The bicoid mRNA is translated after fertilization. The Bicoid proteins are present in higher concentrations at the anterior end and diffuse through the cell to create a concentration gradient from the anterior to the posterior end.
The correct answer would be the nervous system and the endocrine system which is also controlled by the nervous system