Key Concepts Of Biology Flashcards Preview

Edexcel GCSE Biology - Foundation > Key Concepts Of Biology > Flashcards

Flashcards in Key Concepts Of Biology Deck (50)
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31

What do organisms need to synthesis (make)

Make big to small molecules e.g. make new cells

32

Carbohydrates break what and give example

Breaks carbohydrates into simple sugars

E.g. amylase is a type of carbohydrase which breaks down starch

33

What do proteases break down

Proteases break down protein into amino acids

34

Lipases break down what

Lipases break down lipids into glycerol and fatty acids

35

What is the optimum

Maximum point(at the top of the graph)

36

What is denatured

The shape of the active site has Changed differently

37

The higher the substrate concentration...

The faster the reaction

38

What is the equation of rate of reaction





Rate= 1000
———
Time

39

Calculate the rate of reaction which finished 80 secs use the unit s-1


Rate= 1000
———
Time


1000
——— = 12.5
80

40

What is diffusion

Spreading out of particles from a high to low concentration

41

What is osmosis

Movement of water across a partially permeable membrane from less to more concentrated

42

What is a partially permeable membrane

A membrane with small holes in it

43

Where does water pass through in osmosis

Passes both ways through a membrane

44

Which molecules can pass through the membrane and which ones can’t and why

Small molecules can pass and big molecules can’t because the big ones can’t pass through the wholes whereas the small can fit through the hole

45

Because the osmosis is water going from less to more concentrated what does it mean for the more concentrated side?

The more concentrated gets more diluted

46

What is Active Transport

Movement of particles across a membrane from low to high concentration

47

Active transport moves particles against what ?

A concentration gradient

48

What does active transport also require and what is it released by?

It requires energy, which is released by respiration

49

When doing a practical on investigating osmosis what is the independent variable (change)

The independent variable is the concentration of the sucrose solution

50

What is the equation for percentage change in mass?




Percentage= final mass - starting mass.
———————————— x100
Starting Mass