inorganic ions and water Flashcards

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1
Q

what is the function of Mg2+ ions?

A
  • needed for synthesis of chlorophyll
  • also for development of bones and teeth
  • lack of: chlorosis
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2
Q

what is the function of Fe2+ ions?

A
  • constituent of haemoglobin, which allows oxygen to be carried in the blood
  • lack of: anaemia
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3
Q

what is the function of PO34- ions?

A
  • needed for synthesis of DNA, RNA and nucleic acids
  • constituent of phospholipids
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4
Q

what is the function of Ca2+ ions?

A
  • needed for development of bones and teeth
  • also involved in synapses
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5
Q

what is meant when water is said to be a ‘dipole’?

A

it is a molecule that has separate, oppositely charged ends

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6
Q

hydrogen bonds…

A
  • formed between delta + on H and delta - on O
  • weak but strong in large numbers
  • form a lattice that creates cohesion (allows water to be drawn up in continuous columns eg. in xylem vessels)
  • allows high surface tension
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7
Q

what is good about water being a dipole?

A
  • it makes water a good solvent as it attracts other charged particles and dissolves
  • allows cells to maintain concentration gradients
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8
Q

what is water in terms of biochemical reactions?

A
  • good metabolite
  • used in reactions as a reactant or a product
  • eg. with CO2 in photosynthesis and hydrolysis
  • eg. in aerobic respiration and condensation reactions
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9
Q

water has a high s…

A
  • high specific heat capacity
  • large amount of heat energy needed to raise 1kg of water by 1oC (hydrogen bonds restrict molecule movement)
  • prevents large fluctuations in water temperature which creates a stable habitat
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10
Q

water has a high…

A
  • high latent heat of vaporisation
  • a lot of heat energy needed to change its state
  • helps with thermo/osmoregulation as heat is used up in order to vaporise water from sweat on skin/ leaf surface
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11
Q

extra qualities helpful in water?

A
  • transparent
  • light can pass through, enables photosynthesis in aquatic plants
  • water is denser than air
  • provides support and buoyancy
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