OCR F211 june 11 biology mark scheme ( not official)

This is a mark scheme that i created myself after having a biology mock and going through it in class.

as this is not the official mark scheme i have not include addition comments that mark schemes usually have as to whats allowed and what is not. applogies in advance

hope that you find this mark scheme useful for your revision x

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  • Created by: Nicole
  • Created on: 04-01-12 18:26
Preview of OCR F211 june 11 biology mark scheme ( not official)

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The unofficial mark scheme for biology F211 June 2011
Question 1.
i. Any 1 from :
The function of the golgi apparatus is to package proteins (into vesicles)
Receives and modifies proteins from the ER (1 Max)
ii. Contains pores that substances are able to diffuse in and out of the nucleus
so that messenger RNA can leave the nucleus (Max 2)
Comment : 1st mark is for saying that substances can diffuse out to the nucleus
2nd mark is for saying what specifically leaves ( or enters) the nucleus
So: substances like messenger RNA are able to diffuse out of the nucleus = 2 marks
iii. Contain digestive enzymes to break down materials ( like organelles)
b. A collection of 1 or more tissues ( 1 mark) that work together to perform a
particular function (2nd mark) 2 Max
c. Any 4 with explanations from the following:
Thin squamous epithelium ­ provides a short diffusion distance
Surfactant on surface of epithelium ­ reduces surface tension-prevents collapse of
the alveoli
Cartilage ­ holds the trachea open- prevent collapse of trachea during inhalation
Idea of presence of a macrophage to engulf and destroy pathogens
Elastic fibres enable tissues to stretch
Ciliated epithelium contains cilia which allow dust particles to be removed OR goblet
cells which secrete mucus to trap dust particles
QRC : any 3 from : ciliated , epithelium, smooth muscle, diffusion gradient, macrophage,
cartilage or goblet cells Max 5
Q2. A. any 3 from : phospholipids, cholesterol, proteins or glycoproteins
Comment : mark the first 3 points only
B. The movement of molecules or ions against a concentration gradient ( area of low
concentration to an area of high concentration)

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Using transporter proteins/ which requires ATP(to drive the proteins pumps) as a form of
energy 2 Max
ii. Idea of:
Hydrogen ions being actively transported out of the companion cells into the surrounding
Mineral ions/salts being actively transported into root hair cells
Active transport helps us absorbed glucose from our intestines 2 max
c. In order : Osmosis, facilitated diffusion, diffusion
Q3. A.i. X= Right atrium
Y= aorta
Z= pulmonary artery
ii.…read more

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Or percentages of (prophase+metaphase+anaphase+telophase) 2 max
Think single answer scores 2 marks but include calculation just incase
d. meiosis produces genetically different nuclei / the cells are haploid ( half the genetic
Q5. A.i. 3 from:
Breathe regularly
Measure amplitude of waves given tidal volume
Breathe in lid goes down (or opposite)
Person would breathe in with their mouth through the disposable mouthpiece 3max
ii.…read more

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H+ions are actively transported out of the companion cells against a concentration gradient
This creates a diffusion gradient as there is now a low concentration of H+ ion in the
companion cells
This means that H+ ions are able to diffuse into the companion cells
Sucrose is able to diffuse with the H+ ions through special co-transporter proteins
Now high concentration of sucrose in the companion cells and low in sieve tube
Sucrose diffuses from companion cells ( area of high conc) through the plasmadesmata…read more


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