Answer:
C) Through genomic imprinting, methylation regulates expression of the paternal copy of the gene in the brain.
Explanation:
The pattern of gene expression wherein either paternal or maternal gene is expressed in specific cells while the other one is prevented from expression is known as genomic imprinting.
In the given example, the maternal copy of the gene on chromosome 15 is expressed in brain cells while its paternal copy is not expressed in these cells. Hence, the pattern of expression of this gene is regulated through genome imprinting. One of the mechanism is methylation of cytidine residues of CpG islands of the DNA that are more frequently present within promoters of the genes.
When the cytidine residues of these sequences are methylated into 5-methylcytidine, the transcription factors do not bind to these promoters preventing the expression of these genes.
Hence, methylation of cytidine residue in CpG islands of the promoters of the gene present on chromosome 15 could have silenced its expression in brain cells.
Answer:
The correct answer is: D. Ebola.
Explanation:
- Ebola Virus is a single-stranded RNA (ribonucleic acid) virus.
- The natural host of the virus is Fruit bat but it can also infect humans.
- The transmission of the virus into humans is mediated from infected bats through body fluids.
- The major disease caused by the virus is is Hemorrhagic fever. In this disease, the platelet (responsible for clotting of blood) count in the blood drops far below normal. As a result, bleeding can get initiated both in the body interior or exterior. This disease can cause multiple organ failure and death.
- Recently, in the year 2018, the Central African country, Democratic Republic of Congo experienced a severely fatal endemic due to the Ebola virus that killed many people within a short period of time.
Answer:
its D commensalism, one benefits from it and the other gets no harm
Explanation:
<span>Prolonged stress due to sustained child abuse is associated with reductions in the size of the: hippocampus </span>
Answer:
Autotroph is an organism that produces complex compound on itself and heterotrophs are the one which cannot produce its own food.
Explanation:
- Autotroph are the primary producer that can create the complex compound required for their development from the simple substances that are easily found in the environment.
- Autotroph uses energy from the inorganic chemical reactions and light.
- Heterotrophs depend upon the other nutrition sources because they cannot produce on their own.
- Heterotrophs are consumer where as autotrophs are producer in teh ecosystem.
