Which of the following statements i wqmu. kp1i,o9rgjef xv3 wasm-,7)* ;tpr(yabout the effect of surface area and volume on the cell’upfi- ,q px.mi39roke1y s;jm(r,w gw *7tav)s processes is false?

  Which statement best describes stem cells?z ,wszw-ea hr3kfn:34

  Which is a correct description of the cell type adaptedd9,b h yx3big*6r1cps- ekab8 for gas exchange in the lunckx 9bbp 8d* 1yrgie -,b36ahsgs?

  Which of the following explains the limitations *w85ia2 2ar(xjk wdmb on cell size?

  What is this cell's most likely primary byj/b- (* ;rweh u9itgfunction, and where could it be located inb( *ty/ ;rw9ibgu hje- a mammal?

  Which of the followingi; c.+;vooyiawlzlech94t )+ characteristics of type I pneumocytes contribute to increasing the rate o)zcv +i alile;;t4yow h o.9c+f gas exchange?
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 of t;.z 5t7tlu uxcf-mm* 1sgtmb 5t:gj4s4 qd3zmhe functions of these cells is to produce red and white blood cells. W utf5qts57 s4 uz-:x d.z*1mg ;3mctmgt4mbl jhat type of stem cells has the patient received?

  Based on the Venn diagram, which identifies cardiac muscle cells and st y*fa;jop5gus7c(i,triated muscle fo5pj7 (cf ;utiyas *g,ibres?

Below is a diagram of a motor neuron. Neurons arh ts6k96 myi8ot(f9p t4zg. wuqvk:e;e the longest cells in the human bodimquy8 w: he. tt4kg opvz(k66t9fs9 ;y.
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 respiratorr*/y bgaj/wiqpm id410i yx5 4y distress syndrome, which could be caused by a lack of sufficient surfactant in the pulmonary alveoli. The dib/ yr5xp4 wji1q0yi i adm/*4gagram 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 p1 widznx/ lm g4 i:f)d6.r0ekthat embryonic stem cells are not used in the tr npkfw /dr)lx: ie6 .01izdm4geatment of leukaemia?

  The table shows the diameters of red blood cells from differen; pyy -92 v9b 3boh6vfx6abyjbt organisms. Which red bloody 69;ax3bbv hpof v6b9y j-yb2 cell will have the highest surface area to volume ratio?

1.Explain how the shape of erythrocytes and cells/d6vqm)hg xoqo7 +p/xr -fn)h ds*bb + lining the proximal convoluted tubule make these cells more adapted to the functions they perdrvb*-/mfo67/phqd+)xbxg + o)s qh nform.

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 specialised cells is/arv1* 9p4wg8 nlshbfui:pjgj: 8pq uc4:e not true? jl s4*gjpfuppn1b8:h g i vc:4q8w:9u

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 1 7 qlm hyh(n*bnfor49correct order from smallest to largest?qyrn(n f9mhob14 h7* l

  Which row in the following table gives the corrnl4xit). ef/o yl:q a1rk)(t cect disadvantages of the different stem t q(:n o1iayc)l r4/eklxt.f)cell sources for therapeutic uses?

1.Describe how the usv*q(xv8tr h86 a8 *-q5u , rdcnqwhfyfe of stem cells may be used to treat type I diabetes in the t8 cnw(6uyq*fx,r fr-hv8a5 hq v8*qdfuture.

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 specilsv dgh;f), l1alised 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.