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What is the difference between mRNA and pre-mRNA in a eukaryotic cell?

The major difference between pre-mRNA and mRNA is that pre-mRNA is the immediate product of transcription which is comprised of both exons (coding sequences) and introns (non-coding sequences). After tran...

Answered by Matt Y. • Biology tutor

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Consider the infinite series S=Σ(from n=0 to infinite) u(down n) where u(down n)=lim (from n π to (n+1) π) ((sin t)/t) dt. Explain why the series is alternating.

For the first part of the question we need to try and understand what is actually happening – we have the sum of an integral – where we are summing a sequence of definite integrals. So when n = 0 we have ...

Answered by Stuart D. • Maths tutor

5813 Views

Find an equation of the curve with parametric equations x=3sin(A) and y=4cos(A), in the form bx^2+cy^2=d.

x²=9sin²(A) and y²=16cos²(A)Since sin²(A)+cos²(A)=116x²+9y²=16 x 916x²+9y²=144

Answered by Pranav V. • Maths tutor

3523 Views

Consider the role of social class in Agatha Christie's 'Death on the Nile'.

Here is an essay template for a GCSE, A-Level or undergraduate essay. For the GCSE level, we will follow P.E.E. (point, evidence, explanation) structure, for the A-Level, we will add ‘contextual’ detail t...

Answered by Anna C. • English tutor

3267 Views

What is a control in an experiment?

A scientific control is an experiment or observation designed to minimize the effects of variables other than the independent variable. This increases the reliability of ...

Answered by Alessandra P. • Biology tutor

14947 Views