Ib Bio Hl Chap 1 Cell Essay example

9877 Words Aug 23rd, 2013 40 Pages
1.

Which of the following will contribute to the cell theory? I. II. III. A. B. C. D. I only II only I and III only I, II and III
[1]

Living organisms are composed of cells. All cells come from pre-existing cells by mitosis. Cells are the smallest units of life.

1.

C

2.

A red blood cell is 8 μm in diameter. If drawn 100 times larger than its actual size, what diameter will the drawing be in mm? A. B. C. D. 0.08 mm 0.8 mm 8 mm 80 mm
[1]

2.

B

3.

A cell has cytoplasm, a cell wall, naked DNA and ribosomes. Based on this information, what type of cell could this be? A. B. C. D. A cell from a pine tree A grasshopper cell A human red blood cell A bacterium
[1]

3.

D

4.

What do diffusion and osmosis have
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[RAJ Case et al. 2005. “Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE Atlantic cod Gadus morhua.” MEPS. Vol 301. Pp 267–278. Figs 1 and 3.]

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(c)

State the relationship between (i) latitude and the frequency of the PanIA allele. greatest/great frequencies of PanIA at lowest/low latitudes / a rapid drop in frequency at (60–65 degrees latitude) / lowest/low frequencies at highest/high latitudes Answers which describe/imply the correct step-wise relationship should get credit. Answers stating or implying a negative correlation alone should not get credit. mean surface sea temperature in June and the frequency of the PanIA allele. lowest/low frequencies of PanIA at lowest/low temperatures / a rapid increase in frequency at (8–10 degrees Celsius) / highest/high frequencies at warmest/warm temperatures Answers which describe/imply the correct step-wise relationship should get credit. Answers stating or implying a negative correlation alone should not get credit.

(c)

(i)

1

(ii) ii)

1

(d)

Suggest how natural selection could have caused the relationships shown in the graphs.

(d) (cod with) PanIA allele selected/favoured/better adapted to warmer water; (cod with) PanIB allele selected/favoured/better adapted to colder water; cod that survive can reproduce

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