Lysosome is formed from which of the following cell organelles?
- A.Nucleus
- B.Endoplasmic reticulum
- C.Golgi bodies
- D.Ribosomes
Correct answer
Explanation
The correct answer is C, Golgi bodies. Lysosomes bud off from the Golgi apparatus as small membrane-bound sacs packed with digestive enzymes.
The hydrolytic enzymes of a lysosome are first made on ribosomes attached to the rough endoplasmic reticulum. They then pass to the Golgi apparatus, which modifies, sorts and packs them into vesicles; these vesicles become lysosomes. Lysosomes were discovered by Christian de Duve. They digest worn-out organelles, food particles and invading microbes inside the cell. When a cell is badly damaged, its lysosomes may burst and digest the cell itself, which is why they are called the 'suicide bags' of the cell.
A is wrong because the nucleus holds the genetic material and controls the cell, but it does not make lysosomes. B is wrong because the endoplasmic reticulum helps make the enzymes, while the lysosome itself is pinched off from the Golgi. D is wrong because ribosomes are sites of protein synthesis and have no membrane to form a sac.
Exam tip: Lysosome: formed by the Golgi, discovered by de Duve, called the 'suicide bag' of the cell.
Practice Questions
View allWhich one of the following is the purest form of Carbon ?
- A.Charcoal
- B.Coke
- C.Fullerene
- D.Carbon black
Show answer
Fullerenes are made of carbon atoms alone, with no surface to trap other substances, so they are counted as the purest form of carbon.
Read the full explanation →A planet has a mass M₁ and radius R₁. The value of acceleration due to gravity on its surface is g₁. There is another planet 2, whose mass and radius both are two times that of the first planet. Which one of the following is the acceleration due to gravity on the surface of planet 2?
- A.g₁
- B.2g₁
- C.g₁/2
- D.g₁/4
Show answer
Surface gravity is g = GM/R², so doubling the mass doubles g while doubling the radius divides it by four, leaving g₁ × 2/4 = g₁/2.
Read the full explanation →Which one of the following is the major constituent of biogas ?
- A.Carbon dioxide
- B.Nitrous oxide
- C.Methane
- D.Oxygen
Show answer
Methane makes up the largest share of biogas, usually about 55 to 75 per cent, and it is the gas that burns.
Read the full explanation →A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of
- A.reflection of light
- B.scattering of light
- C.refraction of light
- D.polarization of light
Show answer
The lemon looks bigger because light from it bends as it passes from water through the curved glass into air.
Read the full explanation →Which one of the following conclusions could not be derived from Rutherford's α-particle scattering experiment?
- A.Most of the space in the atom is empty.
- B.The radius of the atom is about 10⁵ times the radius of the nucleus.
- C.Electrons move in a circular path of fixed energy called orbits.
- D.Nearly all the mass of the atom resides in the nucleus.
Show answer
. Orbits of fixed energy were proposed by Niels Bohr in 1913; Rutherford's experiment said nothing about the energy of electrons.
Read the full explanation →