Which of the following statements about thezxno hswh0o4b,f22 v- effect of surface area and volume on the cell’o0f4,nsv-22 z wh oxbhs processes is false?

  Which statement best describes stem cellsuhg z *4n5pwbn /7las8?

  Which is a correct description ofrm:jsn3 t +*nm the cell type adapted for gas exchange in the lun s3j* mrtnm+:ngs?

  Which of the followi5jch73cw- uk.w 4p rmwvgqg/ d9i-ly)ng explains the limitations on cell size?

  What is this cell's most l(gc:hi r 4k, t31nzkx7qgu3awikely primary function, and where could it be located in a 3hka1 :q c gt37ikzgnxw,4ru( mammal?

  Which of the following charaq;(.i5jwa te5fjb/, rn ubxgx.0ayh0ko1b 6n cteristics of type I pneumocytes contribute to increasing the rate of gasnfb w;o6ek1q .xx5n0b.ag0r5iab , tju/( hjy 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 the funct4 *f6wu.:o tbxbq l +:fldrm7uions of these cells is to produce red and white blood :*bd4 :6xwql.fm7uurb+ o fltcells. What type of stem cells has the patient received?

  Based on the Venn diagram, which ident7kjv sj10on mk)*,s7fn/vriu ifies cardiac muscle cells and striated muscle fibres? )7 k n1ikf,sso*vmj/urn0jv 7

Below is a diagram of a motor neuron. Neurons are the longest cells in jnmp 4tpu)--g pwg )t+ywhv6p 9yf-.x 7iyg;w the human m4ppw+ t) gw y9pjgh6-.p ngv)x f;twu7iy--y body.
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 respiratory distress synd,; kkv2b3vwb arome, which could be caused by a lack of sufficient surfactant in the pulmonak2avv, k3bw ;bry 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 followin)9ec5 *j jtsrx* f4fxhg is a reason that embryonic stem cells are not used in the treatment of leukaemfh fjs*4xjxer t*)c 95ia?

  The table shows the diameters of red blood cells from different ort dzdtjez 7r z9*s+2i6w3/aatganisms. Which red blood cell will have the highest surfacr37 dzdatt69 /z we *ijst+az2e area to volume ratio?

1.Explain how the shape or+kcw8y 8dxh) f erythrocytes and cells lining the proximal convoluted tubule make these cells more adapted to the functions they pr8ycxkh wd8)+ erform.

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 em(e/ opx,zsa/w bryonic stem cells and specialised cells is/are not truezs,o a xwp(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 hqtxu8rd z0oo,bci5*f ,) ln*is the correct order from smallest to largest?lb o0 xrdh,f*tz)*cn,u8iq5o

  Which row in the following table gives f.( 0s8q1;ecd)+tvfd uhelfethe correct disadvantages of the different stem cell; ev1t+0eh cqu)(d f8def. sfl sources for therapeutic uses?

1.Describe how the use of stem cellmitehmbmq 7(p qisd*u4:+29 ss may be used to treat type I diabetes in the future. *e 27(bhspq4m u9iiqd :+mtsm

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 sp fj-n:fc6z0g iwqczm2/, clw5s1 uad u:jb8 4recialised 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.