1. tRNA molecules: A. form extensive and variable tertiary structures. B. are co
ID: 65074 • Letter: 1
Question
1. tRNA molecules: A. form extensive and variable tertiary structures. B. are comprised only of the standard four nucleotides. C. have a triplet 5'-3' codon that interacts with mRNA. D. have their amino acid attached covalently at the 5' end. E. None of the above.
2. Processing of tRNA molecules can include all of the following EXCEPT: A. splicing to remove introns. B. modification of nucleotides. C. addition of nucleotides at the 5' end. D. separation of multiple tRNA molecules on single transcripts. E. Actually, all of these take place.
3. crRNA is different from miRNA and siRNA in that: A. it is found in eukaryotes. B. it is not produced by the dicer protein. C. it inhibits translation. D. it mediates RNA interference. E. None of the above.
4. lncRNAs are described by all of the following EXCEPT: A. they lack open reading frames. B. they are generally over 100 nucleotides in length. C. they seem to serve to regulate translation. D. B and C. E. All of the above.
5. Which of the following statements concerning ribosomes is NOT true? A. A functional ribosome consists of large and small ribosomal subunits in both eukaryotes and prokaryotes. B. Each ribosomal subunit consists of one or more piece of RNA and a number of proteins. C. The genes for rRNA are present in multiple copies and moderately repeated throughout the genome. D. Precursor ribosomal RNA is processed only in eukaryotic cells but not in bacterial cells. E. In eukaryotes, small nucleolar RNAs help to process and assemble into mature ribosomes.
Explanation / Answer
Answer to Q1.
Correct option should be
E: none of the above
Explanation:
tRNA is about 70-90 nucleotides and it also consists of unusual bases like dihydrouridine. It has anticodon in 3-5' direction. Amino acid is attached to its 3'end.
Correct option should be
E: none of the above
Explanation:
tRNA is about 70-90 nucleotides and it also consists of unusual bases like dihydrouridine. It has anticodon in 3-5' direction. Amino acid is attached to its 3'end.
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