True or False: EXPLAIN the false ________ 1. An A-T base pair and a G-C base pai

Question

True or False: EXPLAIN the false

________ 1. An A-T base pair and a G-C base pair have about the same physical dimensions.

________ 2. mRNA is double-stranded.

________ 3. rRNA and tRNA may have modified nucleotide residues.

________ 4. Eukaryote DNA is normally complexed with histones.

________ 5. Circular DNA is supercoiled.

________ 6. Two strands of DNA run parallel from their 5’ to 3’ ends.

________ 7. An G-C base pair contains two hydrogen bonds.

________ 8. Positively charged counterions are associated with DNA.

________ 9. Bacterial ribosomes consist of a 40S and a 60S subunits.

________10. DNA base pairs are parallel to the helix axis.

________11. Only 4 different bases are found in tRNAs.

________12. Messenger RNA is degraded more quickly than ribosomal RNA.

________13. A-DNA is thought to be the principal form that occurs in nature.

________14. The denaturation of DNA by heat is called melting.

________15. A DNA helix with more A-T base pairs will melt at a higher temperature than a comparable DNA helix with more G-C base pairs

Explanation / Answer

True or False: EXPLAIN the false

True 1. An A-T base pair and a G-C base pair have about the same physical dimensions.

False 2. mRNA is double-stranded.

Only DNA is double stranded. All RNAs are single stranded. RNA may work by secondary structure but basically they are Single stranded.

True 3. rRNA and tRNA may have modified nucleotide residues.

True 4. Eukaryote DNA is normally complexed with histones.

True 5. Circular DNA is supercoiled.

False 6. Two strands of DNA run parallel from their 5’ to 3’ ends.

Two strands of DNA run antiparallel from their 5’ to 3’ end of one strand and 3’ to 5’ of other.

False 7. An G-C base pair contains two hydrogen bonds.

An G-C base pair contains three hydrogen bonds.

True 8. Positively charged counterions are associated with DNA.

False 9. Bacterial ribosomes consist of a 40S and a 60S subunits.

Prokaryotes have 70S ribosomes, each consisting of a small (30S) and a large (50S) subunit

False 10. DNA base pairs are parallel to the helix axis.

DNA base pairs are perpendicular to the helix axis.

True 11. Only 4 different bases are found in tRNAs.

True 12. Messenger RNA is degraded more quickly than ribosomal RNA.

False 13. A-DNA is thought to be the principal form that occurs in nature.

B-DNA is thought to be the principal form that occurs in nature.

True 14. The denaturation of DNA by heat is called melting.

False 15. A DNA helix with more A-T base pairs will melt at a higher temperature than a comparable DNA helix with more G-C base pairs

DNA with more G-C base pair is stable.

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