Variation in biochemistry

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  • Created by: Sopha8
  • Created on: 27-05-14 12:55
Name 5 organelles in animal cells and state their purpose
ribosomes-protein syntheisis, plasma membrane-controls what goes in and out, mitochondira-aerobic respiration to produce atp cytoplasm-where chemcal reactions occur, contains enzymes nuclues-contains genetic material
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Describe the structure of a chloroplast and state its purpose
site of photosyntheisis, double membrane with thylakoid membranes inside stacked up to form grana, linked by lamella, contain chlorophyll
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What reaction joins monosaccharides and what bond is formed?
condensation, glycosidic bond, forms polysaccharides
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What is cellulose?
unbranched chains of beta-glucose, linked by hydrogen bonds to form strong microfibrils, used in cell wall
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What is the main store of energy material in plants?
starch, insoluble, 2 polysaccharides of alpha-glucose- amylose (unbranched, coils) and amylopectin (branched, easy acces to enzymes)
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Wha is glycogen?
energy store material in animals, lots of side braches, more surface area for enzymes so quick release
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What's the structure of haemoglobin? How many oxygens can each one carry?
quaternary protein structure-4 polypetide chains, 4 oxygen molecules, forms oxyhaemoglobin
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What is affinity for oxygen?
tendency a molecule has to bind with oxygen, in haemoglobin it depends on partial pressure of oxygen, higher pressure=association (loading, e.g alveoli), lower pressure=dissociation (e.g respiring tissue)
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What does a dissociation curve show?
how saturated haemoglobin is with oxygen, s-shape as more saturated makes it harder to load
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Explain the effects of CO2 concentration on haemoglobin affinity
dissociates more readily at higher partial pressures of CO2, get more O2 to cells during activity
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What are 3 vairations in haemoglobins affinity for oxygen to do with an organisms conditions?
1. low-oxygen environments=highter affinity, has to be good at loading as not much O2 avalible, 2. high activity levels=lower affinity to unload easily and meet demand, 3. size, smaller=larger sa:v lose heat quickly, lower affinity to unload easily
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Card 2

Front

Describe the structure of a chloroplast and state its purpose

Back

site of photosyntheisis, double membrane with thylakoid membranes inside stacked up to form grana, linked by lamella, contain chlorophyll

Card 3

Front

What reaction joins monosaccharides and what bond is formed?

Back

Preview of the front of card 3

Card 4

Front

What is cellulose?

Back

Preview of the front of card 4

Card 5

Front

What is the main store of energy material in plants?

Back

Preview of the front of card 5
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