Dna Rna And Protein Synthesis
A mononucleotide is hydrolysed into its three constituent components. Which combination correctly identifies these components?
Which statement correctly classifies the nitrogenous bases found in nucleic acids?
Two adjacent mononucleotides are joined together in a polynucleotide chain. Which bond forms and between which carbon atoms?
A section of double-stranded DNA contains 200 base pairs in total. Of these base pairs, 60 are guanine–cytosine pairs. How many hydrogen bonds hold this section together?
In a sample of double-stranded DNA, 28% of the bases are adenine. What percentage of the bases are guanine?
Which statement correctly describes the role of DNA polymerase during DNA replication?
Meselson and Stahl grew bacteria in ¹⁵N medium for many generations and then transferred them to ¹⁴N medium. After one round of replication in ¹⁴N, a single band of intermediate density was observed. Which model of DNA replication did this single observation definitively rule out?
The genetic code is described as “degenerate.” Which statement best describes a consequence of this property?
A scientist studying a virus discovers a nucleic acid molecule that is single-stranded and contains the bases A, U, C, and G. Which conclusion is most appropriate?
A section of the DNA antisense (template) strand reads 3’–T A C G G A T A A–5’. What is the sequence of the corresponding mRNA produced during transcription?
Which statement correctly distinguishes a codon from an anticodon?
During translation, a ribosome reaches a stop codon on the mRNA. What happens next?
A geneticist examines a mutated gene and finds that a single base substitution in the third position of a triplet has occurred, but the polypeptide produced is identical to the original. Which feature of the genetic code best explains this observation?
Which row correctly compares transcription and translation?
A scientist genetically engineers a bacterial cell so that all of its DNA polymerase enzymes are non-functional but RNA polymerase and ribosomes still work normally. Which prediction is most accurate?
In the DNA double helix, a purine always pairs with a pyrimidine across the two strands. What is the most important structural consequence of this arrangement?
Which statement about tRNA is correct?
A gene is best defined as: