DNA polymeraseDNA helicase
DNA helicase splits the two strands by breaking hydrogen bonds, then DNA polymerase goes along the strand making complimentary base pairs.
D A C B ED C B E AD B E C A
The five stages of the cell cycle are interphase, prophase, metaphase, anaphase, telophase.
It's a chloroplast, responsible for photosynthesis.
It's the nucleus, where the cell's genetic information is held.
Atomic radius is a measure of the distance from the nucleus of an atom to the boundary of its electron cloud. Atomic radius increases as you go down the periodic table, adding electron shells to atoms, but decreases as you go across the periodic table and nuclear charge increase, pulling electrons in closer to the nucleus. Na (sodium) atoms have the largest atomic radius in the third row of the periodic table.
Compounds that have the same chemical formula but different structural formula.Compounds that have the same chemical formula and structural formula, but a different configuration in 3D space.
The other description refers to stereoisomers.
It reacts with Tollens’ reagent to form silver.It has a higher boiling point than ethanol.Its empirical and molecular formulas are different.
Ethanal, also known as acetaldehyde, is an aldehyde – and aldehydes react with Tollens' reagent to make silver.
Photoelectric effectElectron diffraction
You wouldn't see an interference pattern in Young's double slit experiment if electrons didn't behave like waves.
Gravitational potential can have a positive value.The gravitational potential at the surface of the Earth is zero.The gravitational potential gradient at a point has the same numerical value as the gravitational field strength at that point.
Gravitational potential is always negative, and at the Earth's surface is -63 MJ kg-1.
An object whose absolute magnitude is known.An object whose absolute magnitude is constant.An object whose apparent magnitude is constant.
Cepheid variables and Type 1A supernova are standard candles.
Ultrasound is non-ionising so less likely to cause harm.Ultrasound gives good images of soft tissue.Ultrasound gives a better resolution image.
X-rays show more detail than ultrasound scans.
Could You Pass A-Level Science?
It's pretty impressive that you did so badly on a multiple-choice test. Well done.
Not great – maybe you were unlucky with the questions?
If actual A-levels were multiple choice, you'd definitely pass.
Congratulations, you passed.
You passed with flying colours – well done.