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Answers by Naina B.

It has pH less than 7, 7 is neutral pH or rather ideal buffer pH. Anything less than & is moving towards acidic pH and anything above & is moving towards alkaline pH.    Acidic pH requires some alkali to neutralize acidity and get  a neutral pH. Likewise alkaline pH...

To add to Noel's answer, positive transcription factor or activator bind to its activation site in the promoter region and modulate the DNA-protein or chromatin configuration in a manner that facilitates RNA polymerase binding at specific transcription start site for the onset of transcription.   Some...

Noel has nicely explained the molecular mechanism of repressor,  an inhibitory transcription factor or a negative regulator of transcription.   In simplistic terms, they are like light switches that are turned off unless one needs light.Cells turn off certain genes unless they...

We have more bones in hand and wrist since we have developed a bipedal mode of locomotion and have used our forelimbs for advanced functions, the first of which was tool making evident in certain group of monkeys and bonobos.   As primates continued to use their forelimbs for variety...

Choice D is correct on following grounds; International attention with salt march resulted in Gandhi-Irwin pact, Gandhi agreed to end his civil disobedience through salt march and Irwin agreed to free Indian prisoners that ruling British govt. had imprisoned as participants of salt March. Indian...

Anusha,   Mark M nicely explained you the steps, these are true for two types of cell division: mitosis and meiosis.    All body cells in animals an plants divide into two daughter cells by mitosis.   All germ cells in plants and animals divide by meiosis,...

Alex,   Animal cells destroy toxic particles by combination of endocytosis, lysosome digestion and exocytosis.   Firstly, cell encircles the toxin in a small vesicle by endocytosis. If cell senses that toxin in vicinity then cell membrane creates projections around it to...

It is the preserved specimen (plant, animal or sometimes simply the shell/skeleton/stem and branches that are buried in earth in between stones or heavy layers of sediment.   Best, 

Hi Jaime,   Assuming that your question pertain to human sex determination, here is the answer:   In humans and most mammals, females have XX ( two X chromosomes) and they are homozygous for X chromosome.   In humans and most mammals, males have XY, ( one X...

Three parent baby is a baby where two biological parents contribute genome through their sperm and egg for the zygote to morula to blastocyst to embryo to fetus to baby.   Blastocyst is implanted in the uterus of a mother different than biological mother, this foster mother becomes...