OCR Biology Exam Practice Questions &
Answers
1ai) Drawing fig 1.2 - teacher sees two of labels are incorrect and that the biological drawing
was poor quality
identify 1 incorrect label and explain your answer - ANSWERSribosome, you cant see this with a
light microscope
1aii) state 3 changes other than labels that student should make to improve biological drawing -
ANSWERS- no arrowheads
- no shading
- give a title
1b) both a TEM and SEM can be used to view same cell BUT images formed will be different
Compare the resolutions of these microscopes and the images formed by them - ANSWERS-
TEM has a better resolution
- TEM shows ultra structure of cell
- SEM shows only shows cell surface
- TEM shows image of cell interior whereas SEM shows the 3D image
- TEM has resolution to 0.2nm whereas SEM has resolution to 20nm
1ci) student wrote following passage about cells
identify 3 errors and correct them - ANSWERSE1 - spleen
C1 - bone marrow
E2- blood vessel
, C2- its in trachea
E3- cell wall thickest
C3- cell wall thinnest
1cii) body mass of man= 73kg, neutrophil production measured at approx. 3804bn cells in 24h
period, when healthy he was producing 1.6bn neutrphills kg-1h-1
Calculate % increase in neutrophil production due to infection. - ANSWERSA-35.7
WO- 1.6x73x24
1ciii) erythrocytes, neutrophils, squamous and epithelial cells are all examples of specialised
cells
Describe how each of these four cells is specialised for its function - ANSWERS- RBC- no
nucleus= large SA:V has short diffusion distance to centre of cell, flexible shape to move through
blood vessels
- neutrophils- have many lysosomes to digest pathogens
- squamous- one cell thick for rapid diffusion of oxygen in lungs
- epithelial- have hair like structures which beat in rhythm to move mucus, trap pathogens from
getting to the lungs
2aii Mucus composed of water, carbs, proteins, triglycerides. its secreted by goblet cells
why do goblet cells have many of cellular component labelled A- mitochondria? - ANSWERSto
provide lots of energy
2aii) suggest how role of cellular component B is relevant to function of the goblet cell - Golgi? -
ANSWERSgolgi aparatus to package proteins into vesicles
2bi) mucus is presented as condensed granules
- mucus expands to 500x its vol. in 20ms, 40cm3 of mucus is held in condensed granules
Answers
1ai) Drawing fig 1.2 - teacher sees two of labels are incorrect and that the biological drawing
was poor quality
identify 1 incorrect label and explain your answer - ANSWERSribosome, you cant see this with a
light microscope
1aii) state 3 changes other than labels that student should make to improve biological drawing -
ANSWERS- no arrowheads
- no shading
- give a title
1b) both a TEM and SEM can be used to view same cell BUT images formed will be different
Compare the resolutions of these microscopes and the images formed by them - ANSWERS-
TEM has a better resolution
- TEM shows ultra structure of cell
- SEM shows only shows cell surface
- TEM shows image of cell interior whereas SEM shows the 3D image
- TEM has resolution to 0.2nm whereas SEM has resolution to 20nm
1ci) student wrote following passage about cells
identify 3 errors and correct them - ANSWERSE1 - spleen
C1 - bone marrow
E2- blood vessel
, C2- its in trachea
E3- cell wall thickest
C3- cell wall thinnest
1cii) body mass of man= 73kg, neutrophil production measured at approx. 3804bn cells in 24h
period, when healthy he was producing 1.6bn neutrphills kg-1h-1
Calculate % increase in neutrophil production due to infection. - ANSWERSA-35.7
WO- 1.6x73x24
1ciii) erythrocytes, neutrophils, squamous and epithelial cells are all examples of specialised
cells
Describe how each of these four cells is specialised for its function - ANSWERS- RBC- no
nucleus= large SA:V has short diffusion distance to centre of cell, flexible shape to move through
blood vessels
- neutrophils- have many lysosomes to digest pathogens
- squamous- one cell thick for rapid diffusion of oxygen in lungs
- epithelial- have hair like structures which beat in rhythm to move mucus, trap pathogens from
getting to the lungs
2aii Mucus composed of water, carbs, proteins, triglycerides. its secreted by goblet cells
why do goblet cells have many of cellular component labelled A- mitochondria? - ANSWERSto
provide lots of energy
2aii) suggest how role of cellular component B is relevant to function of the goblet cell - Golgi? -
ANSWERSgolgi aparatus to package proteins into vesicles
2bi) mucus is presented as condensed granules
- mucus expands to 500x its vol. in 20ms, 40cm3 of mucus is held in condensed granules
