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STD 11 - 8. Cell the unit of life — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 8. Cell the unit of life1 Mark
MCQ
Algae have cells made up of
  • ✓
    cellulose, galactans and mannans
  • B
    hemicellulose, pectins and proteins
  • C
    pectins, cellulose and proteins
  • D
    cellulose, hemicellulose and pectins.
✓

Answer

Correct option: A.
cellulose, galactans and mannans
a
(a) : Majority of algae (eukaryotes) possess a definite cell wall containing cellulose and other carbohydrates. In algal cell wall, different chemical components are present which vary widely among different groups ($e.g.$, xylan, mannan, galactan, alginic acid, silica, agar, pectin, carrageenin, etc.). Cell wall of blue­green algae is made up of micro­peptides (proteins). This micro­peptide is not found in eukaryotic algae.

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