Ib Bio Hl Chap 1 Cell

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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 in common? A. B. C. D. They only happen in living cells. They require transport proteins in the membrane. They are passive transport mechanisms. Net movement of substances is against the concentration gradient. [1]

4.

C

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5.

The diagram below shows a cell during mitosis.

What are the structures and stage of mitosis? Stage of mitosis A. B. C. D. 5. D [1]

Structure I chromatid centromere chromatid centromere

Structure II nuclear membrane plasma membrane nuclear membrane plasma membrane

metaphase anaphase anaphase metaphase

6.

Which of the following characteristics found in a structure necessarily indicates that it is alive? A. B. C. D. The presence of genetic material The presence of a lipid bilayer Metabolism Movement [1]

6.

C

7.

Which of the following does not occur during interphase? A. B. C. D. Replication Translation Cytokinesis An increase in the number of mitochondria [1]

7.

C

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8.

Which pair of features is correct for both a human liver cell and an Escherichia coli cell? Human liver cell A. B. C. D. contains DNA associated with protein has 70S ribosomes contains mitochondria contains DNA enclosed by a membrane Escherichia coli cell contains naked DNA has 80S ribosomes contains mitochondria contains DNA associated with protein [1]

8.

A

9.

If a mitochondrion has a length of 5 µm and a student’s drawing of the mitochondrion is 10 mm, what is the magnification of the drawing? A. B. C. D. ×0.0005 ×0.5 ×200 ×2000 [1]

9.

D

10.

PanI is a gene in cod fish that codes for an integral membrane protein called pantophysin. Two alleles of the gene, PanIA and PanIB, code for versions of pantophysin, that differ by four amino acids in one region of the protein. Samples of cod fish were collected from 23 locations in the north Atlantic and were tested to find the proportions of PanIA and PanIB alleles in each population. The results are shown in pie charts, numbered 1–23, on the map below. The proportions of alleles in a population are called the allele frequencies. The frequency of an allele can vary from 0.0 to 1.0. The light grey sectors of the pie charts show the allele frequency of PanIA and the black sectors show the allele frequency of PanIB.

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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.]

(a) 10. (a)

(i) (i) (ii)

State the two populations with the highest PanIB allele frequencies. (population) 1 and (population) 2 (both needed) State the population in which the allele frequencies were closest to 0.5. 1 1

(ii) (population) 11/7/7 and 11

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(b)

Deduce the allele frequencies of a population in which half of the cod fish had the genotype PanIA PanIA, and half had the genotype PanIA PanIB. 1

(b) PanIA 0.75 and PanIB 0.25 / 3 PanIA to 1 PanIB Both must be correct for the mark to be awarded,...
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