Which of the following statements about tRNA molecules is false? a. Although com

Question

Which of the following statements about tRNA molecules is false? a. Although composed of a single strand of RNA, each molecule contains several short, double helical regions. b. The amino acid attachment is always to an A nucleotide at the 3' end of the molecule. c. There is at least one tRNA for each of the 20 amino acids. d. A, C, G, and U are the only bases present in the molecule. e. Any given tRNA will accept only one specific amino acid. Which one of the following statements about ribosomes is true? a. The large subunit contains rRNA molecules; the small subunit does not. b. There are about 25 ribosomes in an E coli cell. c. Ribosomes are relatively small, with molecular weights less than 10, 000. d. The RNA in ribosomes plays a structural, not catalytic, role. e. There are two major ribosomal subunits, each with multiple proteins. Which of the following is not true of tRNA molecules? a. With the right enzyme, any given tRNA molecule will accept any of the 20 amino acids. b. They contain more than four different bases. c. The 3' terminal sequence is -CCA. d. Their anticodons are complementary to the triplet codon the mRNA. e. They contain several short regions of double helix.

Explanation / Answer

Ans-15)

a) FALSE:

b) TRUE : The amino acid attachment is always to an A nucleotide at the 3' end of the molecule.

c) TRUE: There is at least one tRNA for each of the 20 amino acids.There is at least one tRNA for each of the twenty naturally occurring amino acids. Each tRNA is transcribed from a different gene but the tRNA genes are clustered in the genome of some organisms

d) TRUE: In RNA itself 4 bases preseent are A, C, G, U. And not T thymine (instead U uracil)

e) TRUE: Any given tRNA will accept only one specific amino acid.

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