Cell : The Unit of Life

What is true about ribosomes?

• The prokaryotic ribosomes are 80S, where S stands for sedimentation coefficient. 

• These are composed of ribonucleic acid and proteins

• These are found only in eukaryotic cells

• These are found only in eukaryotic cells

Nuclear membrane is absent 

• Penicillium

• Agaricus

• Volvox

• Volvox

Select the correct statement from the following regarding cell membrane.

• Na⁺ and K⁺ ions move across cell membrane by passive transport

• Proteins make up 60 to 70% of the cell membrane

• Lipids are arranged in a bilayer with polar heads towards the inner part

• Lipids are arranged in a bilayer with polar heads towards the inner part

Which one of the following structures is an organelle within an organelle?

• Ribosome

• Peroxisome

• ER

• ER

Which one of the following cellular parts is correctly described?

• Thylakoids - flattened membranous sacs forming the grana of chloroplasts

• Centrioles - sites for active RNA synthesis

• Ribosomes - those on chloroplasts are larger (80s) while those in the cytoplasm are smaller (70s)

• Ribosomes - those on chloroplasts are larger (80s) while those in the cytoplasm are smaller (70s)

The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are

• cristate

• grana

• stroma lamellae

• stroma lamellae

The chromosomes in which centromere is situated close to one end are

• metacentric

• acrocentric

• telocentric

• telocentric

Select the correct matching in the following pairs

• Smooth ER — Oxidation of phospholipids

• Smooth ER — Synthesis of lipids

• Rough ER — Synthesis of glycogen

• Rough ER — Synthesis of glycogen

True nucleus is absent in 

• Anabaena

• Mucor

• Vaucheria

• Vaucheria

Which one of the following is not an inclusion body found in prokaryotes?

• Phosphate granule

• Cyanophycean granule

• Glycogen granule

• Glycogen granule