Which of the following statements about the effect of surfaceycp+e 2p5x2 ve area and volume on the c+x52 v 2ceyppeell’s processes is false?

  Which statement best descr71nq 0aron1 i n4,z0uv 0faziribes stem cells?

  Which is a correct description of the cell type adapted fo1kiz lqnj:pddi ,nrtszlc ) bp)k60t1t6s3,+r gas exchange in the lungs?npsj lpcq+6d,31n6btk: , dz) 1 t0sztkri) li

  Which of the following explains the limitat14sn y2 am8v91t 1*xjix hgzkvions on cell size?

  What is this cell's most likely primary fuod:g* h ,7z ;htmxltt(nction, and where could it be located in a mammal?tht z *;:xhml7t,(dgo

  Which of the following characteristics of type I pnywthoq 5y o yi-64d,jwns7 8l/eumocytes contribute to increasing the rate of gas exchangwo j iy85sd/4 6w 7otyhn,lqy-e?
I.
Cells are flattened
II.
Secretion of a surfactant
III.
Cover less than 10% of the alveolar surface

  A patient receives a bone maysqo7 gy:a3 rixod );6jfam/8rrow transplant from a 36 year old. One of the functions of tqj8o7aym )af:ior36/ gd ;ys xhese cells is to produce red and white blood cells. What type of stem cells has the patient received?

  Based on the Venn diagram, which identif ,j+uddb(1c ykqs9 pe,ies cardiac muscle cells and striated muscbys uj1q,9de+ ,kdc(p le fibres?

Below is a diagram of a motok6ui( :q xjwv.jvwu: 9veamtg:tb5) :r neuron. Neurons are the longest cells in the human body. jm b5t)tu .: 9uwxj vge:ia:q(6:wkvv
1.Explain the factors that limit cell size in humans.
2.Explain how life functions are performed by Paramecium.

Premature babies sometimes suffer from jvpeo6 e(:(kn infant respiratory distress syndrome, which could be caused by a lack of sufficient surfop( 6jnk :(eevactant 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 embrf;o/n*uyt w;09- s lgviq )kwiyonic stem cells are not used in the treatmenttv;lu9 *g;)0wn-f s iw/ioykq of leukaemia?

  The table shows the diameters of o i q*0qceo(rf,ps 8bq; /6sxay.o5wwred blood cells from different organisms. Which red blood cell will have the highest surfa w5s,i qrqofo.seyx 0pc(;* waoqb 8/6ce area to volume ratio?

1.Explain how the shape o4o)l kh. l+vbdy2nj2g0tjg);d uxrx; f erythrocytes and cells lining the proximal convoluted t)42n0 )d tj rhxlu2xyogb;dj ;k+lg.vubule make these cells more 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 and cqi+d 0nw0 le:specialised cells is/are not truei+n:0le0 q wcd?

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 followr3ga)r n0i57g gvhiw9 ing is the correct order from smallest to largest?hg39ga nr ir5w0vgi7)

  Which row in the following table gives the correct disadvantages of the dii7 ig;cq5d mkfav8r++ t bubt;j8*5vefferent stem cell sr7 85i cgiab q tv;b+e+m dtu;*fvj5k8ources for therapeutic uses?

1.Describe how the use of stem cells may be usey810a4y l sux3esrj: qd to treat type I diabetes in the future 1 4l8r:e3usjsxa0yyq.

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 (notf5rzdl8bn r.(zm. hi :3fg 7pj 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.