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When starting learning Portuguese, some may wonder whether they need to opt for European (Portuguese as spoken in Portugal) or Brazilian Portuguese. The differences lie mainly in pronunciation, although t...

1. mRNA is only single stranded, whereas DNA is a double stranded molecule 2. mRNA has Uracil instead of thymine which is found in DNA 3. mRNA contains no introns as they have been spliced out, however...

As you go across the period, the number of protons increases, however the amount of shielding stays the same, so attraction of outer electrons to nucleus increases and more energy is required to remove an...

First of all, multiply secx by (secx+tanx)/(secx+tanx). Use the substitution u=secx+tanx, so that du=(secxtanx+sec²x) dx and then substitute both terms. Calculate the integral of the du/u arriv...

Assuming that the walkway is moving in a positive direction, the child is walking in the opposite direction to it and is therefore walking in the negative direction. Both the child and the walkway have ve...