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SNAB EDEXCEL BIOLOGY AS TOPIC 1 QUESTIONS WITH COMPLETE SOLUTIONS (UPDATED 2026/2027)

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SNAB EDEXCEL BIOLOGY AS TOPIC 1 QUESTIONS WITH COMPLETE SOLUTIONS (UPDATED 2026/2027)

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Polysaccharide


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Carbohydrates that are made up of more than two monosaccharides




Amylopectin


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long, branched chain of lots of alpha glucose molecules joined by 1,4 and
1,6 glycosidic bonds with lots of side branches




Why is water a polar molecule

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Oxygen is more electronegative than Hydrogen so there is a slight
difference in charge between the atoms.




Why cant complex multi cellular organisms rely on diffusion to transport substances
around the body?


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They are too large for diffusion to transport substances quickly enough




What are the risk factors of cardiovascular disease beyond your control


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gender, age, genetics




Why is excess LDL and saturated fats bad


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Excess LDLs overload receptors and so increase blood cholesterol levels.
Saturated fats decrease LDL receptor activity so LDL is not removed from
the blood. Instead, cholesterol is deposited in artery walls causing
atheromas

,Risk


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chance of something unfavorable happening




How does an atheroma form


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White blood cells accumulate chemicals especially cholesterol and this
deposit builds up




What do thromboplastin and calcium ions from plasma do


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trigger the conversion of prothrombin into thrombin




Why do people overestimate risks


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The risk is involuntary, not natural, unfamiliar, dreaded, unfair

, Cholesterol


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a short lipid molecule made from saturated fats in the liver




What type of bond holds two monosaccharides together in a disaccharide?


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Glycosidic bond




Platelet inhibitory drugs


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Type of anticoagulant. Makes platelets less sticky to prevent them from
clumping together to form a blood clot.




Treatment to reduce blood cholesterol levels


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statins

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