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In August 2018, Ofqual announced that it had intervened to adjust the GCSE Science grade boundaries for students who had taken the "higher tier" paper in its new double award science exams and performed poorly, due to an excessive number of students in danger of receiving a grade of "U" or "unclassified". [3]
The GCSE combined science A exam is made up of six papers (each one hour and ten minutes): two each for biology, chemistry and physics respectively. In combined science B, the science curriculum is delivered in four parts: biology, chemistry, physics and combined science.
AQA Education, [1] trading as AQA (formerly the Assessment and Qualifications Alliance), is an awarding body in England, Wales and Northern Ireland. It compiles specifications and holds examinations in various subjects at GCSE, AS and A Level and offers vocational qualifications. AQA is a registered charity and independent of the government.
The first GCSE exams were sat in 1988. [6] They replaced the former CSE and O-Level qualifications, uniting the two qualifications to allow access to the full range of grades for more pupils. However the exam papers of the GCSE sometimes had a choice of questions, designed for the more able and the less able candidates.
In biology, a marker gene may have several meanings. In nuclear biology and molecular biology, a marker gene is a gene used to determine if a nucleic acid sequence has been successfully inserted into an organism's DNA. In particular, there are two sub-types of these marker genes: a selectable marker and a marker for screening.
For example, DNA is a molecular marker that gives information about the organism from which it was taken. For another example, some proteins can be molecular markers of Alzheimer's disease in a person from which they are taken. [1] Molecular markers may be non-biological. Non-biological markers are often used in environmental studies. [2]
To remember the order of taxa in biology (Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species, [Variety]): " D ear K ing P hilip C ame O ver F or G ood S oup" is often cited as a non-vulgar method for teaching students to memorize the taxonomic classification of system.
The £5 commemorative notes, issued to mark the 125th anniversary of the construction of the Forth Bridge, contain several new security features including a reflective graphic printed over a transparent "window" in the banknote. [117] [118] Further notes in the polymer series will be introduced over time, replacing the previous paper notes.