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Abiotic components - Answer Components of an ecosystem that are non living Abiotic factors - Answer Non living components of an ecosystem that effect other living organisms Acetycholine - Answer Chemical that acts as a transmitter that diffuses across synaptic cleft Acetycholinesterase - Answer Enzyme in synaptic cleft that breaks down acetycholine. After it has triggered an action potential in the post synaptic neurone, acetycholine must be broken down otherwise it would remain in the sy...

What is a microscope? - Answer A microscope is an instrument which allows us to magnify an object thousands times larger, allowing us to see even unicellular organisms. When were the first light microscopes created? - Answer 16th and 17th centuries When was cell theory developed? - Answer The 19th century What did Cell Theory state? - Answer -Both plant and animal tissue is composed of cells -Cells are the basic unit of all life -Cells only develop from existing cells Why is light microsc...

Why do multicellular plants need transport systems? (4) - Answer Need water, minerals and sugars to live and also need to get rid of waste substances. Multicellular plants have a low SA:V, however they are relatively big with a high metabolic rate. Exchanging substances by direct diffusion would be too slow to meet their metabolic needs. So plants need transport systems to move substances to and from individual cells quickly. What is the function of the xylem? - Answer To transport water a...

What is a hypothesis? - Answer A statement about what you expect your results will show What is a null hypothesis? - Answer A statement that says that there will be no significant different / correlation between the things you are measuring. You want to disprove the null. When would you use the Chi-Squared test? - Answer If you wanted to look at differences in frequencies between groups. E.g. Is there a difference between the frequency of different bird species at 2 different sites? Chi-S...

The following general structure is representative of sulphonamides. Which of the following statements is true for active sulphonamides? a)R1 can be H or an alkyl group b)R2must be hydrogen c)The aromatic ring is essential d)The sulphonamidefunctional group can be replaced with an ester - Answer C. The aromatic ring is essential Which of the following statements is true regarding the properties of benzylpenicillin? a)It is a bacteriostatic agent. b)It is active over a wide range of bacte...

What are the 4 stages of aerobic respiration? - Answer 1. Glycolysis 2. Link Reaction 3. Krebs Cycle 4. Oxidative Phosphorylation What is the primary substrate used in respiration? - Answer Glucose What are the 3 coenzymes used in respiration? - Answer 1. CoA (Coenzyme A) 2. NAD (Nicotine Adenine Dinucleotide) 3. FAD (Flavine Adenine Dinucleotide)