Which of the following statements about the effect of surface area and 66e,o)mrryz au ;cq6o ci 28hl 2-nwgjvolume on the cell’s proces8e; qorimr62)jzl h2 ,c naycg6ow-u6 ses is false?

  Which statement best d-cun+7go/e wq+ iz sd,escribes stem cells?

  Which is a correct description of the cell type adaptex9vmf53 :atp zd for gas exchange in the lungm9vzf : pt3x5as?

  Which of the following explains the limitato p5c 8cg1mg7 ojq8,nqions on cell size?

  What is this cell's most likely primt9t tr(v)tr;l ary function, and where could it be located in a mammal?( rvtt lttr9);

  Which of the following characteristics of type I dd(2bj6lnxb ; pneumocytes contribute to increasing the rate of gas excha ;x blj(2d6bndnge?
I.
Cells are flattened
II.
Secretion of a surfactant
III.
Cover less than 10% of the alveolar surface

  A patient receives a bone marrow transplant from a 36 year old. One ovfd *ezzrea; .y v753l)pj gptw27r1df the functioe71ljp ; e r3.)g7ddr zzfway p*5tv2vns of these cells is to produce red and white blood cells. What type of stem cells has the patient received?

  Based on the Venn diagram, which5*azqlwdew ,6obv,0 io0 3zrg identifies cardiac muscle cells and striated mu 5*z3lbvqgwr adw60 oeo, i,0zscle fibres?

Below is a diagram of a motor neuron. Neurons are the longest cells in thercvh7dh q03. s human body.h7r 3q. s0dvch
1.Explain the factors that limit cell size in humans.
2.Explain how life functions are performed by Paramecium.

Premature babies sometimesbvq8bge8fr 4rme8; 5j suffer from infant respiratory distress syndrome, which could be caused by a lack of sufficient surfa8 reb 84r8vq;5bjme fgctant in the pulmonary alveoli. The diagram below shows two different alveoli structures.


1.Describe one feature of the surfactant.

2.Suggest a treatment for infant respiratory distress syndrome.

3.Draw a labelled diagram of the structures in an alveolus that are important for gas exchange.

  Which of the following is a reason that embryonic stem cells are not used i-c 2awzyf xk) 0vep7f/n the treatment of leu) 7v- f0aexpf2z kycw/kaemia?

  The table shows the diameters of red blood cells from different organisms. Whicliu *t1nd9up;x x90b e na1s(plon8n 9h red blood cell will have the highest surface area to volume ratio?enubxst1 nla(0;oi *9 98xpn 9updnl1

1.Explain how the shape of erythrocytes and cells lining the proximal convors9xa l*;r1) zr/jijt 0vf1u mluted tubule make these cells more adapted tlj/us*m 9; )zx1vj10rfta irro the functions they perform.

2.Compare and contrast the structure of striated muscle cells and cardiac muscle fibres.

3.Explain how the structure of egg and sperm cells are adapted to their functions.

  Which statements about embryonic stem cells and special o*2qghjc ,j-iised cells is/are not true?i*2jqh-j ,o cg

I. Embryonic stem cells have higher levels of DNA methylation than differentiated cells
II. Specialised cells are more differentiated than embryonic stem cells
III. Most specialised cells and embryonic stem cells both contain the entire genome of an organism

  In humans, which of the following is the correct order from smallest to cg cfi,4ee53 ok7f7z6wjc u i7largest?7zkeic4i65e37j , fucf7ow gc

  Which row in the following table gives thb5ead3 d*fit x0 z8*sn x6i q*8aa,ykhe correct disadvantages of the different stem cell sourceszx5d ae*t 30,si* 8by8f6xdhk *iana q for therapeutic uses?

1.Describe how the use of stem cells may be used to treat type I diabetes in t 6ss 7 cln;x9/f4v2jj urks;mdhe futvl6 x; rdn2skuc jsm/;9fj4 7sure.

2.Explain the factors that limit cell size in humans.

3.Explain how red blood cells and striated muscle fibres are adapted to their function.

Below are diagrams of specialised cells f) bpl)y:j 6hbez er45(not to scale).

1.Put these cells in order of size, from the smallest to the largest.

2.Compare and contrast totipotent, pluripotent and multipotent stem cells.