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Please help explain why they are false? thanks 1. Ribosomes are large RNA structures composed solely...

Please help explain why they are false? thanks

1. Ribosomes are large RNA structures composed solely of rRNA.

2. Ribosomes are synthesized entirely in the cytoplasm.

3. A ribosome binds one tRNA at a time.

4. Ribosomes must bind to the 5′ cap before initiating translation

5. Misfolded proteins are delivered to the proteasome, where they are sequestered from the cytoplasm and can

attempt to refold.

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Answer #1

1. True. Ribosomes consists of two sub units, they are 70s and 30s.

2). True. Because mRNA is present in the cytoplasm

3. True. Ribosome has the three sitesfor binding of tRNA. They are A, P andE site.

4). True. It is ribosome binding site on mRNA for start codon.

5. False.The main function of the proteasome is to degrade unneeded or damaged proteins by proteolysis

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