Which of the following statements about the y)wqs) v/-bst effect of surface area and volume on the cell’s processebq-sv /s yt)w)s is false?

  Which statement best m7j(ug.+ar*) v1 3:fpmor uzlr+ fmbc wo:hw4describes stem cells?

  Which is a correct description of the cell type ajtumen /+kt:exsj 43+7yav. jdapted for gas exchange in the lungsmene jv4kt3+y/ st.aj:u+x 7j?

  Which of the following explains the limitatk8x-qvxtjx-tvi 46 u7ions on cell size?

  What is this cell's most likely primary function, and wher9/3jgjs 9r3yawq k: *,h- zhrff:tfvxd9 r4q re could it be located in a mammal? h *f9j q3g y93k,/4ad-:q9 wzfrsrxr:hrvtfj

  Which of the following characteristics of type I pneumocytes contribute to incre0l 8 i m8wnuc:7ozpw)kasing the rate of gas exchi lpwwz70mc unk)8:8o ange?
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 q8 jgbrm jnnu9y6+;9h36 year old. One of the functions of these cells is to produce red and white blood cells. What type ofjn r986y g;+uqnm9h jb stem cells has the patient received?

  Based on the Venn diagrcs.w.o+.j qm xpto5 ekt7.r; xam, which identifies cardiac muscle cells and striated muscle fibres? qx7k.5e;.+ c. j rpot.stxom w

Below is a diagram of a motor neuron. Neuro48y5tnsl+po- 2udk dz ns are the longest cells in the human boz nu5l4tko2 s+dy8-d pdy.
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 u6z 5) q6iaplwp,,de;w bxk8trome, which could be caused by a lack of sufficient surfactant in the pulmonary alveoli. The diagram below shows two differle)k6buix ad6 zq 5,;ptp w8w,ent 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.yohz8p nv3 q5 a reason that embryonic stem cells are not used in the trepzn5y o3hv. 8qatment of leukaemia?

  The table shows the diameters of red blood cells from different kw,7 bng3tf ifs+ fo*+organisms. Which red blood cell will have th+gf kftn3+ fwo 7i,b*se highest surface area to volume ratio?

1.Explain how the shape of erythrocytes and cells lining thegj( 8jafve(r2+c njz : proximal convoluted tubule make these cells rf :e8g(vnj+2z c ja(jmore 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 emb(nu6i wq n5)yrl le 2t1g6y9roryonic stem cells and specialised cells is/are not truoy 6un(gt916 )li ryqen w2lr5e?

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 acza*3ki3i1ay g2 +1x gb8ibfto largest?azb8 bi 1yf2x1a* kc g+a3gi3i

  Which row in the following table gives the correct disadvantag jciu 2kznjdi 6*l /*o8np(js+es of the different stem cell sources for therapeu2nlk 8j*ji/zup cis6( n+ o*jdtic uses?

1.Describe how the use of stem cells may m)a/1t 1x1d( wukn pjorpgd70be used to treat type I diabetes in the )0o7 mnwr(tp/xau1 dj1pg1dk future.

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 m nk.y4w-:tki 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.