11. The protoplast can be used to
A. modify genetic information
B. create plant hybrid
C. study plant viral infections
D. all of these
12. Which of the following is incorrect?
A. Mammalian cells are larger and more complex than microorganisms
B. Their growth rate is very fast compared to microorganisms
C. Mammalian cells are fragile
D. Most animal cells only grow when attached to surface
13. The size of a single plant cell is usually within the range of
A. 10-20μm in diameter and 25-100μm long
B. 20-40μm in diameter and 100-200μm long
C. 40-60μm in diameter and 200-300μm long
D. 60-80μm in diameter and 300-400μm long
14. Which of the following is incorrect?
A. Plant cells are larger than the bacterial or fungus cells
B. Plant cells tend to grow in clumps
C. Plant cells are less sensitive to shear than microbial cells
D. Plant cells are more genetically unstable than microbial cells
15. The archaebacterium Halobacterium, an extreme halophile, and Sulfolobus, a thermoacidophile, can be cultured in the presence of antibiotics such as streptomycin and chloramphenicol because
A. they contain ether-linked isoprenoids in their plasma membrane
B. they lack murein in their cell wall
C. they contain 80S, as opposed to 70S, ribosomes
D. all of the above
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