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Cell : The Unit of Life

Multiple Choice Questions

311.

In which method of transport, in plasma membrane does not require carrier molecule?

Active transport
Facilitated diffusion
Simple diffusion
Na⁺ - K⁺ pump

312.

Which structure is present in both prokaryotic and eukaryotic plant cells?

Cell wall
Nucleus
Chloroplast
Mitochondria

Short Answer Type

313.

What is telomere? State its function.

314.

What is riophorins?

Multiple Choice Questions

315.

What is mitoplast?

Membraneless mitochondria
Another name of mitochondria
Mitochondria without outer membrane
Mitochondria without inner membrane

316.

Thylakoids occur inside

mitochondria
chloroplast
Golgi apparatus
endoplasmic reticulum

317.

Mitochondria are semiautonomous as they possess

DNA
DNA and RNA
DNA, RNA and ribosomes
Protein

318.
Which of the cell organelle lacks membrane?

Mesosome

Mitochondria

Ribosome

Liposome

Ribosome

Ribosomes are the granular structures, composed of ribonucleic acid (RNA) and proteins acid and hence, are not surrounded by any membrane. They were first observed by George Palade (1953) under the electron microscope as dense particles. The eukaryotic ribosomes are 80S, while the prokaryotic ribosomes are 70S.