Which of the following statements about the effect of surface area and volume on)r,df fn1 qyivl jrgm+18gaa,,2py 2l the cell’s processes i, 1 i gaaqpv,r1yr8gyf,mdl2 +j n)lf2s false?

  Which statement best descr pjt1+y4rbp1v 2 rri9wibes stem cells?

  Which is a correct desca3v umc,: *y9vwqwx(j:-zgd nription of the cell type adapted for gas exchange in the lun 3*9vav- g wmwjq,dc ux(n::zygs?

  Which of the following explains the lim6ns.fd/wqhdbx 54 qahh-c 1/h itations on cell size?

  What is this cell's most likel0h zl s//7j3yheyvpm:cgpq61y primary function, and where could it be located iq3y0jeplhpshm/: 1 c6yvg7/z n a mammal?

  Which of the following characteristics of type I pneumocytes :zp2,bl qs-taarbr; gi3 4m4trf.b o5contribute to increasing the rate orgspbrz a:q-if3. lom2 4a4;br ,tbt5f 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 o1iv,g .wot h0t.egk u2ld. One of the functions of these cells is to produce red and white blood cells. What type of stem cells has the patient received2e,gu.0 .1wtgtkov hi?

  Based on the Venn diagram, which identifies cardiac muscle cells and striated mu:5m; qz.oj ;k hwhs9 p5yf)v-hl7nkxyscle fibr hohljky5:k;w9n5p shxq zv7-;f. ym) es?

Below is a diagram of a motor neuron. Neurons are 31 -dv 3o+qn6wh v/l+oyan an9u7cypf the longest cells in the human bodn31no nfvyavy6 wchp+d-/ l9 a7+uo3q y.
1.Explain the factors that limit cell size in humans.
2.Explain how life functions are performed by Paramecium.

Premature babies sometimes suffer froml 1i--q +/y qnlt 6z6nj6tv:n)zhwhea infant respiratory distress syndrome, which could be caused by a lack of sufficient surfactant in the pulmonary alveoli. The diagram below sq-whz6:h6l)/z tiy1t vl n+qne ajn-6hows 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 qa7gtzgvln5( a-)4j 5k e-r hhare not used in the treatmenta47)ar -(gt zhh gn 55qke-vlj of leukaemia?

  The table shows the diameters of red blood cells from di)ru).u xpea /ffferent organisms. Which red blood cell will have the highesaxe /u). up)rft surface area to volume ratio?

1.Explain how the shape of erythrocytes and cells linin+e:zz,0c) 9hmoe nidtrj,2jsg the proximal convoluted tubule make these cells more adapted to the functions they perfori +zzdh9m cejtre:j 2)s ,n,0om.

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/are not tru p x8t/)qg sv:nu-q*gb)tq g:pqbg usx 8vn*-/e?

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 scin(wd-f,94fa t,y;j ;gjv gis the correct order from smallest to largest?-4j9gy sfwgdft;aci ;vj ,(n,

  Which row in the folz8x:fkib/4ejy,j0seq gx, y 6lowing table gives the correct disadvantages of the different stem cell sources for therapeutic us, 0exj gx,if:/ybeq64jzs k8yes?

1.Describe how the use of stem cells may be used to treat typedvys e+0wjr1))7iy0 n (fe1rdg gwue. I diabetes in the gw7 s )1rwdv+0f)i d jgu10ny(eey. refuture.

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 cele ka a*ga:u f-2c;u. rc;w)mflls (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.