E-PolyLearning

26. Which of the following observations is not used as evidence to support the concept of endosymbiotic origin of chloroplasts and mitochondria?
a. Both have their own DNA
b. Both have their own ribosomes
c. Both strongly resemble prokaryotes, especially in size
d. Both can live and function independently of the cell
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Answer: (d).Both can live and function independently of the cell

27. The fluid matrix of a cell is called the
a. nucleus
b. cytosol
c. cytoskeleton
d. endoplasmic reticulum
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Answer: (b).cytosol

28. Which of the following elements is likely to form the least polar covalent bond with hydrogen?
a. Nitrogen
b. Oxygen
c. Carbon
d. Phosphorus
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Answer: (c).Carbon

29. The mitochondria were known in the nineteenth century to be osmotically active on the basis of evidence that
a. the mitochondrial matrix is hypotonic to the cellular cytoplasm
b. the mitochondrial matrix is hypertonic to the cellular cytoplasm
c. mitochondria were derived from a symbiotic bacterium
d. mitochondria are surrounded by a semi permeable membrane
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Answer: (d).mitochondria are surrounded by a semi permeable membrane

30. Mitochondria can be expected most numerous in
a. green cells
b. red blood cells
c. muscle cells
d. none of these
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Answer: (c).muscle cells

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