Question

20) A) an enzyme that synthesizes RNA as part of the transcription process B) an enzyme that uses RNA as a substrate C) an enzyme that catalyzes the association between the large and small ribosomal subunits D) an enzyme that synthesizes RNA primers during DNA replication E) an RNA with enzymatic activity 20) What is a ribozyme? 21) 21) Alternative RN A splicing A) increases the rate of transcription. B) can allow the production of similar proteins from different RNAs C) can allow the production of proteins of different sizes from a single mRNA D) is a mechanism for increasing the rate of transcription. E) is due to the presence or absence of particular snRNPs 22) 22) A particular triplet of bases in the coding sequence of DNA is AAA. The anticodon on the tRNA that binds the mRNA codon is A) UUA B) AAA C) TTT E) either UAA or TAA, depending on first base wobble. 23) What is the effect of a nonsense mutation in a gene? 23) A) It prevents introns from being excised B) It changes an amino acid in the encoded protein C) It has no effect on the amino acid sequence ot the encoded protein. D) It alters the reading frame of the mRNA E) It introduces a premature stop codon into the mRNA 24) Of the following, which is the most current description of a gene? 24) A) a DNA-RNA sequence combination that results in an enzymatic product B) a DNA subunit that codes for a single complete protein C) a discrete unit of hereditary information that consists of a sequence of amino acids D) a unit of heredity that causes formation of a phenotypic characteristic E) a segment of DNA sequence that is expressed to form a functional product: either RNA or polypeptide 25) Which of the following statements is true about protein synthesis in prokaryotes 25) A) Translation can begin while transcription is still in progress B) Unlike eukaryotes, C) Prokaryotic prokaryotes require no initiation or elongation factors cells have complicated mechanisms for targeting proteins to the appropriate ellular organelles D) Translation requires antibiotic activity E) Extensive RNA processing is required before prokaryotic transcrs The following questions refer to this table of codons

pls fo all

Answer 1

I beleive the correct answer to be:

20) E

21) C

22) C

23) E

24) E

25) A

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