Oxford Revise AQA GCSE Combined Science Foundation | Chapter B1 answers

Question Answers Extra information Mark AO / Specification reference
01.1

A – cell wall

B – cell membrane

C – cytoplasm

D – chloroplast

E – vacuole

F – nucleus

 

1

1

1

1

1

1

AO2

4.1.1.2

01.2 chloroplast   1

AO1

4.1.1.2

01.3 control the cell / contain genetic material   1

AO1

4.1.1.1

01.4 cell wall   1

AO2

4.1.1.2

02.1

nucleus – both

cell wall – plant only

cytoplasm – both

vacuole – plant only

 

1

1

1

1

AO1

4.1.1.2

02.2

nucleus – contains genetic material and controls the cell

mitochondria – where respiration occurs

chloroplast – where photosynthesis occurs

vacuole – contains cell sap to keep the cell firm

cell membrane – controls what comes in and out of a cell

4 marks for all correct

3 marks for three correct

2 marks for two correct

1 mark for one correct

4

AO1

4.1.1.1

02.3 (electron / light) microscope   1

AO1

4.1.1.5

03.1 A cell that is adapted / has special features to perform a particular function   1

AO1

4.1.1.3

03.2 To contract (and relax)   1

AO1

4.1.1.3

03.3

Any one from:

  • Digestive system
  • to squeeze food along the gut
  • In the heart
  • so heart can contract to pump blood around the body
Answer should include a muscle location, with a description of their role in that location

1

1

AO1

4.1.1.3

03.4

Mitochondria is where respiration occurs

Respiration releases energy for muscles to contract

 

1

1

AO1

4.1.1.3

03.5

Contain proteins / actin and myosin

That slide over one another to cause the cell to contract

Or

Store glycogen

Which can be broken down (into glucose) and used for respiration

 

1

1

AO1

4.1.1.3

04.1 wear gloves / wash hands / disinfect work surfaces / dispose of used swabs   1

AO1

4.1.1.5

04.2 nucleus   1

AO2

4.1.1.2

04.3 makes nucleus / subcellular structures more visible   1

AO1

4.1.1.5

04.4 use a higher power objective lens   1

AO1

4.1.1.5

05.1

functions

nerve

impulses

sperm

muscle

movement

 

1

1

1

1

1

1

AO1

4.1.1.3

05.2 differentiation   1

AO1

4.1.1.4

05.3 root hair cell / xylem / phloem / palisade cell Accept other plant specialised cell 1

AO1

4.1.1.3

06.1

cell wall

cytoplasm

 

1

1

AO1

4.1.1.1

4.1.1.2

06.2 to provide movement   1

AO1

4.1.1.3

06.3

Any one from:

  • bacteria has no nucleus / presence of plasmid / no vacuole
  • bacterial cell is much smaller
Accept reverse argument 1

AO2

4.1.1.1

4.1.1.2

06.4

bacterial cell

as no nucleus is present / presence of plasmid

Reason required for mark 1

AO1

4.1.1.2

07.1 plant   1

AO1

4.1.1.3

07.2 to absorb water   1

AO1

4.1.1.3

07.3

large

maximise

chloroplasts

unable

 

1

1

1

1

AO1

4.1.1.3

08.1 Level 3: Valid method described that would lead to clear observation of cheek cells. Appropriate apparatus given either as a list of named within the method. 5–6

AO1

4.1.1.5

  Level 2: Appropriate method given that would lead to observation of cheek cells OR incomplete attempt at a valid method provided and some equipment named. 3–4  
  Level 1: An incomplete attempt at valid method given. 1–2  
  No Relevant content 0  
 

Indicative content

  • apparatus: Cotton swab, a microscope slide, tweezers, a coverslip, mounted needle, a microscope, stain (such as methylene blue)
  • Wipe inside of the cheek with a cotton swab
  • Smear cotton swab on the centre of the microscope slide
  • Add a drop of stain
  • Carefully lower a coverslip onto the slide
  • Use filter paper to soak up any liquid from around the edge of the coverslip
  • Put the slide on the microscope stage at its highest setting
  • Choose the lowest powered objective lens
  • Carefully lower slide using focusing knob until the cells come into focus
  • (For more detail repeat with higher power objective lens)
   
08.2

Cell membrane

Nucleus

Cytoplasm

Allow additional label to mitochondria

1

1

1

AO2

4.1.1.5

4.1.1.2

08.3 Magnification used   1

AO2

4.1.1.5

08.4 The smallest object which can be viewed under a microscope   1

AO1

4.1.1.5

08.5 By using an electron microscope   1  
09.1 microscope with scale   1

AO2

4.1.1.5

09.2 1 mm   1

AO2

4.1.1.1

09.3 125 µm   1

AO3

4.1.1.1

09.4 ignore when calculating a mean / repeat the measurement   1

AO3

4.1.1.1

10.1 A   1

AO2

4.1.1.5

4.1.1.2

10.2 Where protein synthesis takes place / proteins are made   1

AO1

4.1.1.2

10.3 Mitochondria   1

AO2

4.1.1.2

10.4
  • Apparatus: Plant, a knife or scalpel, a microscope slide, tweezers, a coverslip, mounted needle, a microscope, stain (such as iodine)
  • Place on slide
  • Add a drop of stain
  • Carefully lower a coverslip onto the slide. (Use a piece of filter paper to soak up any liquid from around the edge of the coverslip)
  • Put the slide on the microscope stage at its highest setting
  • Choose the lowest powered objective lens
  • Lower slide using focusing knob until the cells come into focus
  • (For more detail repeat with higher objective lens)

1 mark for apparatus

Maximum of 5 marks for valid method

6

AO1

4.1.1.2

4.1.1.5

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