Which of the following statements about the effect of surfwnxd- i) ac*:gace area and volume on the celx-giad: *n)w cl’s processes is false?

  Which statement best descrim6a+l9z8feev zy 43mq bes stem cells?

  Which is a correct description of the cell type adapted for gas exchange in th(foewi( pv x73e lungs(oiv(f3 exp7w ?

  Which of the following r;juh)-i1/ bqm6 i kr/8sk3e(zl dqdxexplains the limitations on cell size?

  What is this cell's most likely primary funct2 nra t ,n:20jff;xruqion, and where could it be located in a ma2xf:a 0t;2j qurrfn ,nmmal?

  Which of the following characteristics of type I pc,y ux 77z.uj g/k13n5e*af eoqvb)weneumocytes contribute to increasing the rate of gas exchange? 3 g. e,jo )wfvzc1q7*yee5x u /kua7bn
I.
Cells are flattened
II.
Secretion of a surfactant
III.
Cover less than 10% of the alveolar surface

  A patient receives a bone marrow tranku7lz*8n/3 dfsfe,su r;86 h 7frpdke splant from a 36 year old. One of the functions of these cells is to produce red and white blood cellsfd88r73zufkk *ru/; e7pdh6ses,nf l . What type of stem cells has the patient received?

  Based on the Venn diagram, which)wr)-ntp e 1d vn.d7yx identifies cardiac muscle cells and striated musdxew-1ynnd) vr )7t .pcle fibres?

Below is a diagram of a motor neuron. Neurons are the xxg+/iqv k hkz,a- .u;longest cells in the human body.x- izuv /;qh+ .gka,xk
1.Explain the factors that limit cell size in humans.
2.Explain how life functions are performed by Paramecium.

Premature babies sometimes suffer from infant respiratujgmx gv+m+5a k2,w);h oi9gjory distress syndrome, which could be caused by a lack of sufficient surfactant in the pulmonary alveoli. ) ij m wxhkgj,+g+;guo9m2v5aThe 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 hzg(di:b /t4 cls:u7ware not used in the treatment of leukaemia?4sht7luizgw : ( cb/d:

  The table shows the diameters of red blood cells from different organisms.+d1rr*nx 8:h y/amqbkj5pm d9 Which red blood cell will have the highesy5qddj:a+8m /1b x9rnh *pmrkt surface area to volume ratio?

1.Explain how the shvvy*a1f2 snf +h8ega8pi9hj *ape of erythrocytes and cells lining the proximal convoluted tubule make these cells mp9ha*hfy 1 g+f a8 2ivvejsn*8ore adapted to 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 an w3;ub s2/brpsuy; 7apd specialised cells is/are not true?uas wr;sb2u yb;p/7 p3

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 smallesaegwr i(-2 .sz)ls,wv t to largest?s 2.)iw(gavlerw,z-s

  Which row in the following table gives the correct disadvantagesz8yx,(tsray*b85fr d wld51g of the different stem cell sources for therape 5gst*zyd xyd lr1b8,f8rw5a(utic uses?

1.Describe how the use of stem cells may be used to treat type I diabetes inh 2ui)gva nh:9 the futuahnigu) :9 v2hre.

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 specialisamg/qqc55i c)ed cells (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.