Which of the following statements about the effect of surfa3 hd0g)r x a7m8rr+qplce area and volume on the cell’s proxgh 8 37d0r rrqam+)lpcesses is false?

  Which statement best descrudxn x8k9w3pqx+o0p *ibes stem cells?

  Which is a correct description o3uy j ib+*v+mrhv*z 1y6a +apdf the cell type adapted for gas exchange in the h*31ua+pi+6zr+ yyvmj bav *d lungs?

  Which of the following explains the limitations on cell si -inmn+s6g q0giz4f,y,yhul 1ze?

  What is this cell's mostt+mcrny xz1/ 1 likely primary function, and where could it be located in a mammal? 1n+ /y1crtm zx

  Which of the following characteristics of type I pneumocytes contributcl46a4awa - cce to increasing the rc w4 6alc-4aacate 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 a:bq-pye ,haoy /gow,bi t-og26 .dc5marrow transplant from a 36 year old. One of the functions of theso edo2 -ayg5tc.:6p wyo,-ih q/ag b,be cells is to produce red and white blood cells. What type of stem cells has the patient received?

  Based on the Venn diagram,-k ku0jv0 4tre which identifies cardiac muscle cells and striated muscle fit4kr 0e 0uk-vjbres?

Below is a diagram of a motor neuron. Neurons are th2e tfib9gn2c dvp j:dy-6cu) 7e longest cells in the human body. 7y)-c c2vb f pe2uj9ng:itdd6
1.Explain the factors that limit cell size in humans.
2.Explain how life functions are performed by Paramecium.

Premature babies sometimes suffeetv c 7*/2: vzi4pbm c2f-woozr from infant respiratory distress syndrome, which could be caused by a lack of sufficient surfactant*bw vc2zf2/o tco4ze7v i-:pm in the 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 cells are not used in nm(bo mcpru: o *a.amhp96u64the treatment of l:h6n r( pp au9ouom4cab.6mm*eukaemia?

  The table shows the diameters of red blood celj;k -rk9jw a7wls from different organisms. Which red blood cell will have the highest surface area to volume rajkj; wr9-kw7atio?

1.Explain how the shape of e*d*sx85w u4z z;ivkdmrythrocytes and cells lining the proximal convoluted tubuld mu* zv4i zd5s8;xwk*e 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 embryonic stem cells and specialised cells is/are not vobe:d, kfeo,zd8 r-; true?,fod,rd ve8e-:bkoz ;

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 correwuelmft1;72my8k e-q ct order from smallest to largest?8 qtwum-kyfm 1l2ee 7;

  Which row in the following table gives the correct disadvantages of them mi3j7aq -xfqu *krg):n3xdf5od;;c different stem cell sources for therapeutic uses?mf 5d;i-j3ruxqa m;g k c:n3f7 )*qdxo

1.Describe how the use of stem cells may be used to treat xbx;kbz3-jti8w1 woe;- cu c-;tc t a*type I diabetes in the future;kc-- ttwzub 3;aj wxoc1 icex-b;8t* .

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 spxl od-.:0 ykxnecialised 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.