Answer:
In sickle cell anemia, blood is also chronically low in oxygen. This lack of oxygen-rich blood can damage nerves and organs, including your kidneys, liver and spleen, and can be fatal. Blindness. Sickle cells can block tiny blood vessels that supply your eyes
Explanation:
Sickle cell disease can cause organ damage, stroke and even death.
Answer: D) retroviruses
Explanation:
Retroviruses are a type of virus that converts its genetic material into DNA using a special enzyme, called reverse transcriptase. The DNA is then able to integrate into the DNA of the host cell. Once integrated, the virus can make additional viral particles using the components of the host cell.
Retroviruses which cause cancer at low incidence do not contain host information inserted. Rather, they tend to cause cancer via the expression mutation of potentially oncogenic host genes. Retroviruses incorporate proviral DNA into their host's chromosomal DNA during their natural life-cycle. Provirus DNA promoter affect regulatory gene expression over.
Hence, the correct option is D.
The geographic poles both wander statement is true.
<u>Explanation:</u>
Earth has geographic North and south poles as well as <em>magnetic south and North poles.</em> Magnetic North is geographic south and magnetic South is geographic North. The Geographic <em>poles of the earth</em> doesn’t remain stationary
Occurrence of perturbations in the earth’s movement doesn’t allow the geographic poles of <em>earth to remain stationary</em>. Over a period of few years the earth’s geographic poles move by few meters.
<em>Cartographic drawings</em> require stable <em>geographic poles</em> and thus use the averaged location of geographic poles.
