Investigating the effects of substrate concentration, temperature and pH on enzyme activity - lock and key model to explain and make predictions about enzyme activity. In some circumstances the brain can modify a reflex response via a neuron to the motor neuron of the reflex arc e.
Be able to describe some of the substances transported into and out of the human body in terms of the requirements of cells, including oxygen, carbon dioxide, water, dissolved food molecules and urea.
A scientific theory is a general explanation that applies to a large number of situations or examples perhaps to all possible oneswhich has been tested and used successfully, and is widely accepted by scientists.
Hormones bind to receptors on effectors, stimulating a response. Agreement between the collected data and the original prediction increases confidence in the tentative explanation hypothesis upon which the prediction is based, but does not prove that the explanation is correct.
The menstrual cycle can be controlled artificially by the administration of hormones, often as an oral pill. In many situations, a factor may not always lead to the outcome, but increases the chance or the risk of it happening.
Be able to explain the importance of maintaining a constant internal environment in response to internal and external change.
Proposing an explanation involves creative thinking.
The first stage requires light and chlorophyll located in chloroplasts in plant cells to split water molecules into hydrogen and oxygen. In the context of data related to organisms within a population: Please note that my GCSE science revision pages are designed to be used for online convenience, so, beware, printouts could be quite long!
Carbon cycles through photosynthesis, food chains, cellular respiration, decomposition and combustion. The transfer of biomass between organisms is one way in which the populations in a community are interdependent, and can be modelled using a food web IaS3.
However, most characteristics depend on the instructions in multiple genes and other parts of the genome. The reactions in photosynthesis and many other biological processes are catalysed by enzymes.
Be able to explain how the structures of nerve cells and synapses relate to their functions. In order to claim that the factor causes the outcome we need to identify a process or mechanism that might account for the observed correlation.
It can be used to predict possible outcomes.GCSE TWENTY FIRST CENTURY SCIENCE BIOLOGY A A/02 Modules B4 B5 B6 (Higher Tier) H INSTRUCTIONS TO CANDIDATES † Write your name, centre number and candidate number in the boxes above.
Please write clearly and in capital letters. † Use black ink. HB pencil may be used for graphs and diagrams only. † Answer all the.
Our Gateway Science and Twenty First Century Science suites have been redeveloped for first teaching in September To find out more about our new physics provision, visit the qualification pages below. Quiz: Twenty-first century science GCSE exam papers The controversial new GCSE science papers, which feature multiple choice questions, have been accused of 'dumbing down' the subject.
But how. OCR Twenty First Century Syllabus GCSE Biology A past exam papers.
If you are not sure what tier you are sitting foundation or higher check with your teacher. You can download the papers and marking schemes by clicking on the links below.
PAST PAPERS OCR GCSE (9–1) Twenty First Century Science COMBINED SCIENCE B biology papers for FT Biology paper 01, HT Biology Paper 05, FT Combined Science Paper 04, HT Combined Science Paper 08 OCR B GCSE Grade Twenty First Century Science Suite biology papers.
Note that all the above past papers are for the Higher Tier of GCSE 21st Century Science, split into 4 units.Download