Nuclear pores allow traffic of _______

mitochondria.

chromosomes during the prometaphase stage of mitosis.

ribosomal subunits out of the nucleus.

proteins into the thylakoid lumen

mRNAs into the nucleus

Which of the following complexes is comprised of RNA and proteins?

(more than one answer possible)

spliceosome

endosome

lysosome

centrosome

ribosome

Solutions

Expert Solution

1. mRNA into nucleus

Nucleus is a double membrane bound organelle which encloses the nucleoplasm and nucleolus inside it. Nucleolus is the site of synthesis of ribosomes.

The double membrane of the nucleus are fused at certain locations with each other to give rise to nuclear pore Complex.

Nuclear pore Complex are the points on the surface of nucleus, from where molecules can cross the nucleus.

This is important for the transportation of messenger RNA after its formation by transcription in nucleus. It comes out after post transcriptional modification to undertake translation in cytoplasm.

2. Spliceosome, ribosome

Spliceosome is formed during post translational modification and is composed of RNA and proteins.

Ribosome is a membrane less organelle involved in protein synthesis and it is also composed of RNA and protein.

Centrosome is composed of centrioles which are made up of proteins. Lysosome is a unit membrane bound organelle involved in digestion of foreign substances and cell debris.

Endosome is a transient membrane bound structure involved in transportation of molecules within the cell.

gladiator answered 1 year ago

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