definitions Flashcards

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1
Q

eukaryotic cells

A

more complex, membrane bound nucleus, organelles carry out biochemical processes, unicellular or multicellular, animal or plant cell

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2
Q

prokaryotic cells

A

lack a nucleus, single DNA structure, unicellular, bacteria or archaea

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3
Q

SA:V ratio

A

smaller cells have a quicker rate of diffusion as molecules travel less distance, increasing metabolic efficiency

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4
Q

major groups of molecules

A

protein, lipid, carbohydrates, nucleic acids

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5
Q

protein

A

growth and repair, enzymes

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6
Q

lipids

A

store energy

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7
Q

carbohydrate

A

energy source

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8
Q

nucleic acid

A

genetic code which controls cell function

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9
Q

aerobic respiration

A

requires oxygen, common
glucose + oxygen –> carbon dioxide + energy

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10
Q

anaerobic respiration

A

occurs when there’s a lack of oxygen
glucose –> lactic acid + energy

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11
Q

photosynthesis

A
  1. light stage - dependent on light
  2. carbon fixation stage - uses CO2
    CO2 + water –> glucose + oxygen
    ( require light energy and chlorophyll)
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12
Q

diffusion

A

movement of molecules from high concentration to low concentration across a semi-permeable membrane

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13
Q

concentration gradient

A

difference in concentration between 2 areas, bigger = faster diffusion

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14
Q

facilitated diffusion

A

when carrier protein and protein channel assist large molecules move across a membrane

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15
Q

osmosis

A

movement of water molecules from high to low water concentration (from low to high solute concentration)

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16
Q

hypertonic

A

gains water - higher solute concentration

17
Q

hypertonic

A

loses water - low solute concentration

18
Q

isotonic

A

no movement - same solute concentration

19
Q

exocytosis

A

materials release from the cell via vesicles

20
Q

endocytosis

A

materials absorbed into the cell within vesicles

21
Q

pinocytosis

A

takes in fluids and dissolved solutes, vesicles form

22
Q

phagocytosis

A

large substances taken into the cell as it encloses it in a vesicle

23
Q

receptor mediated endocytosis

A

particle binds onto a receptor site and enters the cell

24
Q

enzymes

A

proteins, biological catalysts that speed up the reaction rates by lowering activation energy

25
Q

co-enzymes

A

non-protein molecules that assist an enzyme in catalyzing a reaction

26
Q

competitive inhibitor

A

binds to an enzyme’s active site, can be reduced by increasing substrate concentration

27
Q

non competitive inhibitor

A

bind to another site which changes the active site, cannot be affected by increasing substrate concentration