The archaebacterium Halobacterium, an extreme halophile, and Sulfolobus, a therm

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Question
The archaebacterium Halobacterium, an extreme halophile, and Sulfolobus, a thermoacidophile, can be cultured in the presence of antibiotics such as streptomycin and chloramphenicol because
Options
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

Correct Answer

they lack murein in their cell wall

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1. Callus cultures are amorphous cell aggregates arising from the unorganized growth of explants on an
Options
A. liquid medium
B. solid nutrient medium
C. aseptic solid nutrient medium
D. solid or liquid medium

2. The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength of
Options
A. 300-400nm
B. 400-500nm
C. 500-600nm
D. 600-700nm

3. The size of a single plant cell is usually within the range of
Options
A. 10-20?m in diameter and 25-100?m long
B. 20-40?m in diameter and 100-200?m long
C. 40-60?m in diameter and 200-300?m long
D. 60-80?m in diameter and 300-400?m long

6. Which of the following is incorrect?
Options
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

7. Which of the following is incorrect?
Options
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

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