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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.

Telomere is the end of chromosome, which consists of tandemly repeated short sequences of DNA. Each time a cell divides some sequences of the telomere are lost, eventually (after 60-100 divisions in an average cell) the cell dies. Replication of telomeres is directed by telomerase, an enzyme consisting of RNA and protein that is inactive in normal cells of higher organisms.