Investigating Cells – What you need to know
The numbers refer to pages in ‘Leckie & Leckie Success Guide’
Investigating Living Cells (p48)
G
State that cells are the basic units of living things
G
Explain the purpose of staining cells
G
Describe the structure of animal and plant cells and give the
purpose of each part
G
State the difference between plant and animal cells
Investigating Cell Division (p52-53)
G
State that cell division is a means of increasing the number of cells
in an organism
G
State that the nucleus of the cell controls cell activities including
cell division
G
State that each of the two cells produced by cell division has a
complete set of chromosomes, and the same information
C
Describe the stages of mitosis
C
Explain why it is important that the chromosome number is kept
the same following cell division
G
Identify the correct sequence of stages of mitosis
Investigating diffusion (p49-51)
G
State that gases and liquids diffuse from a high concentration to a
low concentration
C
Explain why diffusion is important to organisms
G
State that dissolved food, oxygen, carbon dioxide and water can
enter or leave cells by diffusion
G
State that the cell membrane controls the passage of substances
in and out of cells
G
State that osmosis is a ‘special case’ of diffusion, involving only
water
C
Explain osmosis in terms of a selectively permeable membrane and
concentration gradient
C
Explain the effects of different water concentrations on the
appearance of plant and animal cells (including meaning of turgid
and plasmolysed plant cells)
Investigating enzymes (p54-55)
G
Explain why enzymes are needed in living cells
G
Explain the meaning of the word ‘catalyst’
C
Explain the word ‘specific’ as applied to enzymes and their
substrates
G
Give one example of an enzyme involved in chemical breakdown
(e.g. amylase)
G
Give one example of an enzyme involved in chemical synthesis
(e.g. phosphorylase on glucose-1-phosphate)
G
State that enzymes are made of protein
G
Describe the effect of temperature on enzymes
G
Describe the effect of pH on the activity of pepsin and catalase
C
Explain the word ‘optimum’ in relation to the activity of enzymes
Investigating aerobic respiration (p56-57)
G
State that living cells need energy for growth, division and
movement
C
State that fats and oils contain more chemical energy per gram
than carbohydrates and protein
G
State what happens to the body if energy input and energy output
are not equal
G
State that cells need oxygen to release energy from food during
aerobic respiration
G
Give a word equation for aerobic respiration
G
State that the breakdown of food during respiration releases
carbon dioxide
G
State that heat energy may be released from cells during
respiration
C
State that some of the energy released during respiration is used
in other chemical processes (metabolism) in a cell