Which of the following statements about the effect of surfucja(pyjwzi 78i (g3kt3/m+nace area and volume on the cell’ 3 7+(gic8n/ ktwmaypzjij 3u(s processes is false?

  Which statement best d2fzyq1j89, k6wwkf whescribes stem cells?

  Which is a correct description of the cell type adapted for - tr ju-lwj3n0gas exchange in the l-rj w-t03unlj ungs?

  Which of the following explains the limitations on cell-sh9/hgn2ia rn j,e2m size?

  What is this cell's most likely primary function, and where could+opg:eiy xqld0c :2q1 it be located in a mammal? qpg l +xyq 0oiec2d::1

  Which of the following characteristics of tso-9immr ri *7g+g/qgkh-5 nrt 5rjr ,ype I pneumocytes contribute to increasing the ratjirq,+t79o grsmg n-k5*/g rrhi 5mr- e of 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 the f* f hat)(ym3ruhg21stunctions of these cells is to produce red and white blood cells. mu 23ryt ht*s(a)gh1 fWhat type of stem cells has the patient received?

  Based on the Venn diagram, which iden t9l ns.mgtgc ap/:1s5g 0rlle-s3am 6tifies cardiac muscle cells and striated muscle fibres? s6mcs l g3lg1t5:a0.retgp s n9al-m/

Below is a diagram of a motor neuron. Neuy1a 7eqm4h )s4orrqs6rons are the longest cells in the human b4y s167 ae sqmq)hr4roody.
1.Explain the factors that limit cell size in humans.
2.Explain how life functions are performed by Paramecium.

Premature babies sometimq0a9 +i pa6tlles suffer from infant respiratory distress syndrome, which could be caused by a lack of sufficient surfactant in the pulmonary alveoli. The diagram below shows two different alveoli6a l+a9lit0q p 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 stt-d;r/7fooyek a 8: iab0)z)kgos ofx3s ;am;em cells are not used in the treatmd:;0iosbt -gom za7))orxy k8e ;;ao/fa s3fkent of leukaemia?

  The table shows the diameters of red blood cells from different or+ j()x )n7dbilv,jfp vganisms. Which red b)n7px,vjl(j +)f ibd vlood cell will have the highest surface area to volume ratio?

1.Explain how the shape of erythrocytese()w7t zjyn//*iu hqi and cells lining the proximal convoluted tubule make these cells more adapted to the functions they t(zji * n/e)hwq/ yu7iperform.

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 soa* hi-0 q5lvo 9omh*xtem cells and specialised cells is/are not tru mh0 ooq i*9hv*o-xla5e?

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 smallest to larg rs )m*n;:,c rcrwcbvhz.sceg 9o0g( *est?* wnr;9cg oe vcc,*m br.:gz(shs0r c)

  Which row in the following table gives the correct disadvantages of the diffx)atfc u 1 :ov)pzw4+g7wluk )erent stem cell sources forw)+za)k:cxfl4uv1 p7) go tw u therapeutic uses?

1.Describe how the use of stem cells may be used to treat ty .ja1/ -amk,g+kqrxc(h+v0x koqyv(wpe I diabetes in the fut k/1a0qwvjrx.cvk-q am,((x+kg hy o +ure.

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 specialise j m4.b)gxtb4ld 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.