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How can non-disjunction lead to down syndrome?

Non- disjunction in meiosis can take place at both anaphase I and II. When there is an error in the separation of homologous chromosomes (anaphase I) or sister chromatids (anaphase II), one of the gametes pr...
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Answered by Niall S. • Biology tutor
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What is the role of bile in digestion?

Bile basically has the same function as washing up liquid, it makes it easier to break down fatty material. It is released by the liver, and stored in the gall bladder, before being released into the small i...
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Answered by Kalyan M. • Biology tutor
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mRNA is used during translation to form polypeptides. Describe how mRNA is produced in the nucleus of a cell. (6)

The first step in biology is always to make sure you understand and always use specialist biological terms - it's often said you almost learn more vocab in biology A level than you do in French, and if I had...
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Answered by Omar E. • Biology tutor
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Describe the structure and bonding that contributes to a functional protein.

Translation of an mRNA transcript by ribosomes produces the two-dimensional primary structure – a linear sequence of amino acids held together by strong peptide (covalent) bonds . This linear sequence typica...
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Answered by Edwin J. • Biology tutor
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What are the main similarities and differences between DNA and RNA?

-DNA and RNA are very similar in their molecular structure. Both of them are formed by smaller units called nucleotides. A nucleotide is composed by 3 parts: a sugar group, a phosphate group and a nitrogenou...
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Answered by Hossain D. • Biology tutor
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