Topic 1- Key Concepts Flashcards

Question

Magnification equation

Answer 1

Magnification = image size / actual size

Answer 2

Magnification = length of scale bar / length the bar represents

Answer 3

``` 1m/1000 = 1 millimetre 1mm/1000 = 1 micrometer CELLS 1ym/1000 = 1 nanometer (the micrometer symbol isn’t right) PARTS OF CELLS 1nm/1000 = 1 picometer ```

Answer 4

The degree to which the size of an image is larger than the object itself, expressed as X1000 etc. The ability to see (two) objects (that are close together) as separate objects and see detail

Answer 5

Mouth, stomach and small intestines

Answer 6

Protease enzymes can tolerate a lower pH. The stomach has hydrochloric acid (to kill pathogens)

Answer 7

Enzymes break down larger food molecules (eg.lipids) into small molecules (eg.fatty acids and glycerol)

Answer 8

Pg.19 IN REVISION GUIDE AND LOOK IN SCHOOLBOOK FOR TABLE TO HELP

Answer 9

As temperature increases the rate of reaction increases (include date temperatures if included) The rate is optimum at ... Above the optimum temperature the rate of reaction decreases

Answer 10

This is because as the temperature increases enzymes and substrate molecules gain kinetic energy and successfully collide more frequently... this resulting in more enzyme substrate complex being formed and more products being made After optimum temperature rate of reaction decreases because the increased temperature denatures the enzyme which means... The active site has changed shape this means that no ESCs will form and no product will be made

Answer 11

As pH increases the enzyme activity increases The enzyme activity is optimum at Above the optimum temperature the enzyme activity decreases

Answer 12

This is because as Ph increases fewer active sites are denatured, more ESCs from and more product is made After optimum temperature the increasing pH causes the enzyme’s active site to denature and therefore fewer ESCs form and less product is made

Answer 13

As the pH substrate concentration increases the rate of reaction increases until an optimum substrate concentration of... Above this optimum substrate concentration the rate of reaction stays the same/ does not change at the value of...

Answer 14

This is because as the substrate concentration increases, more successful collisions occur between enzyme and substrate molecules which means more ESCs are formed and more product is made At the point of saturation the rate of reaction is at a maximum because all the active sites are being used

Answer 15

Substances move from a dilute to more concentrated solution (from low to high concentration) Requires energy made from respiration in the mitochondria Eg. Minerals taken into root hair cells from the soil

Answer 16

``` The movement of molecules from an area of high concentration to low concentration Doesn’t require energy Molecules move in random directions Happens in gases and liquids Osmosis is diffusion in water ```

Answer 17

The random movement of water molecules from an area high water potential to an area of low water potential through a partially permeable membrane

Answer 18

Roughy, as the concentration of salt solution increases the change in mass also increased

Answer 19

...water solution-gain ...same water potential ...salt solution-loss

Topic 1- Key Concepts Flashcards

(43 cards)