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Cells

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Cells Assessment- Second Sitting 2015-6

Watch the short video at: https://www.youtube.com/watch?v=Rpj0emEGShQ (see footnote ), then answer the following question 1. Type your answers into the boxes 1) a) What substance are the “yellow, little knobby things” called “Keys” on the virus made of?
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These are made of proteins 1.2

b) The narrator says the “keys” fit into locks”. Do eukaryotes and prokaryotes have similar “locks” and where are they found?
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1.2

c) Specifically what type of substance are these “locks” in eukaryotes made of?
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Cell membrane. 1.2 d) “If the lock fits, the cell welcomes the virus in.” Name the transport process by which the cell takes the virus in.
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Endocytosis. 2.1 e) Name the structure in the host cell that is described as the “welcoming committee, that pulls the virus deeper into the cell”
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The cytoplasm. 1.1 f) Name the organelles described as “little Chefs- those little blue peanutty things” in the video.
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These are cellular ribosomes. 1.1

Now turn to the remaining questions which do not relate to the video.

2).Cell Transport processes.
Study the table below then say whether ”true” or “false” should appear in each box

Box 1 | True | Box 2 | True | Box 3 | True | Box 4 | True | Box 5 | False |
2.1

3.Cell Transport
An Access researcher carried out a pilot investigation into the effects of concentration on the rate of osmosis using visking tubing as shown in the diagram.

a) Table 1 shows their results. From them, calculate the values for Table 2. I. Table 1. Mass of bags at ten minute intervals: Tube | Mass (g) at time (minutes) | | 0 | 10 (t10) | 20 (t20) | 30 (t30) | 40 (t40) | 50 (t50) | A | 3.69 | 3.61 | 3.54 | 3.49 | 3.39 | 0.99 | B | 4.02 | 4.06 | 3.62 | 4.06 | 3.94 | 4.07 | C | 3.73 | 3.80 | 3.82 | 3.91 | 3.91 | 3.95 | D | 3.90 | 4.02 | 4.06 | 4.11 | 4.17 | 4.17 | E | 4.10 | 4.30 | 4.43 | 4.43 | 4.47 | 4.51 | II. Table 2. Calculate the percentage change in mass from zero at each time interval using the formula Mass at t10,t20 etc – Mass at 0 minutes X 100. Mass at 0 minutes
Insert your answers into Table 2-show loss of mass as a negative value Tube | % change in mass from time zero at time (minutes) | | 10 (t10) | 20 (t20) | 30 (t30) | 40 (t40) | 50 (t50) | A | | | | | | B | | | | | | C | | | | | | D | | | | | | E | | | | | |

b) Describe what the box 2 results show.
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2.2
c) Suggest a scientific explanation for your answer to question 3(b)
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2.2

4.Cell respiration (3.1,3.2) a) How are cell respiration and body respiration related?
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(3.2) b)
The table below summarises the main stages of cell respiration, but these are NOT shown in order. Complete the table by filling in the gaps. Stage | Site | Oxygen needed? | What happens? | Kreb cycle | Mitochondria | YesAerobic process | A cyclical set of reactions during which hydrogen is is mopped up by NAD. Carbon dioxide is also released | Glycolysis | Cytoplasm of bacteriaThe matrix of mitochondrion in Eukaryotes. | No | Glucose is converted to2 three carbon molecules.4 molecules of ATP are produced (gross) | Electron Transfer Chain | Mitochondria | Yes | Results in the most ATP synthesis | Link Reaction | Matrix of mitochondrion | Yes | Pyruvate combines with coenzyme A to forms Acetyl CoA |

3.1

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[ 1 ]. You will also find the material in the Cells booklet as well as the short animation at http://www.sumanasinc.com/webcontent/animations/content/hiv.html useful.

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