Q17 / 120 · NEET 2012 (Mains) · Botany

Which one of the following cellular parts is correctly described?

  • Correct answer
    A
    Thylakoids-Flattened membranous sacs forming the grana of chloroplasts
  • B
    Centrioles-Sites for active RNA synthesis
  • C
    Ribosomes-Those on chloroplasts are larger $(80 \mathrm{~S})$ while those in the cytoplasm are smaller (70 S)
  • D
    Lysosomes-Optimally active at a pH of about 8.5

Solution

Centrioles are a membranous hollow microcylinders occur in pair and play important role in cell division. Ribosomes in chloroplast are $70 \mathrm{~S}$ type while those of cytoplasm in eukaryotic cells are $80 \mathrm{~S}$ type. The enzymes of lysosome (called suicidal bag) function at acidic $\mathrm{pH}$ (i.e., 5).

Hence, the correct answer is option: 'A'.

Relevant Questions