Which of the following statements about ly: ) h yr.t* 9nydsi2jq7cnxw3t5k 3sthe effect of surface area and volume on the c5l j3x7tyw .*n2ds)y qy:3scn kh9ritell’s processes is false?

  Which statement best desgu38i1ec8rg c60ghq fcribes stem cells?

  Which is a correct description of the cell tyfdcts k-xn mlhd75/3np+4 nv1pe adapted for gas exchange in the 15n3 dpkncd-m7vhnl4s /f+ xtlungs?

  Which of the following explains the limitations k;sv( rm-azm1+y1b dw -e k9udon cell size?

  What is this cell's most likelwl ow9 2rv3+iu x5cyb5y primary function, and where could it be located in a mamcww vrb95 xu liy352+omal?

  Which of the following characteristics of type I pneumocytes contribute to increlfhs/82p pk f.asing th2 lh /k.pf8sfpe rate 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 i 8 . + 2 76bbeb)x-5goyzxfxtqqi;4 q-knvorcold. One of the functions of these cells is to produce red and white blood celln4)tqrk gii 28-.57 q6 bxzb q;oe-xx+vbofcy s. What type of stem cells has the patient received?

  Based on the Venn diagram, which identifies cardiac muscle cells and striatel;iy*d 3 vx/u/xnbc9fa6 pl/qc2ym8f d muscclu9ab/lxx;cpfi8 3vyy/m6qfd n2/ * le fibres?

Below is a diagram of asijrkm-02 n)0 dk+hsi motor neuron. Neurons are the longest cells in the human b0 2i rk-nmjsk0)hs id+ody.
1.Explain the factors that limit cell size in humans.
2.Explain how life functions are performed by Paramecium.

Premature babies sometimes suffer 9gmuq/6q5*aji xy/ ewfrom infant respiratory distress syndrome, which could be caused by a lack of sufficient surfactant in thqg* 6u/a/m q x9e5ywije 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 embryonic stem coun h,i y k2qa,,j3si;ells are not used in the treatment of syah,; , juq2ki,o3in leukaemia?

  The table shows the diameters of red bloot dfyx:07uto4d cells from different organisms. Which re7ot yx:tuf0d4 d blood cell will have the highest surface area to volume ratio?

1.Explain how the shape of erythrocytes and cells lining the proxi zc/x: dz,5 bo8fsvv8ott7gi.mf48fz mal convolutedo4x civz fd/7ztogzbfmf8 85 8t:sv, . tubule 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 embryonicqlvfku k+9q)1 *h uk/k stem cells and specialised cells is/are not truequuv+hk) 1* qk9fk kl/?

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 j*dbuz q3s,x 3r;h; cplargest?3q;h jcdzs ,3r px*u;b

  Which row in the following u8f,1.g ldf eptable gives the correct disadvantages of the different .f f1gedl8pu, stem cell sources for therapeutic uses?

1.Describe how the use of stem cells may be used to treat type i7 l0ah 4t:adtI diabetes in the fut07 tal tdh4ai: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 specialised cells (not to sca utnf/.)hh/w1q3z lif ja im*7dl,xi7 le).

1.Put these cells in order of size, from the smallest to the largest.

2.Compare and contrast totipotent, pluripotent and multipotent stem cells.