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NURS251 Exam Questions and Answers | 100% Pass

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NURS251 Exam Questions and Answers | 100% Pass A point mutation that changes a codon specifying an amino acid into a stop codon is called a frameshift mutation. nonsense mutation. missense mutation. deletion mutation. - Answer-nonsense mutation The triplet code of CAT in DNA is represented a...

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NURS251 Exam Questions and Answers |
100% Pass

A point mutation that changes a codon specifying an amino acid into a stop codon is called a




frameshift mutation.




nonsense mutation.




missense mutation.




deletion mutation. - Answer✔✔-nonsense mutation


The triplet code of CAT in DNA is represented as ______ in mRNA and ______ in tRNA, respectively.


Correct!




CAU, GUA




CAU, GTA

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,EMILLYCHARLOTTE 2024/2025 ACADEMIC YAER ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED
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CAT, CAT




CAT, GAA - Answer✔✔-CAU, GUA


What is the relationship among genes, DNA, and proteins?




Proteins are the nitrogenous bases that form double strands of DNA in its helical shape.




A gene is a section of DNA that provides the directions for synthesizing a specific protein.




Protein is composed of DNA that is organized into specific gene sequences called amino acids.




DNA is composed of a series of amino acids that provide the directions for synthesizing proteins. -

Answer✔✔-A gene is a section of DNA that provides the directions for synthesizing a specific protein.


What is the expected result of a "nonsense" point mutation?




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No change in amino acid sequence and no change in the composition of the protein product




Replacing an amino acid codon with a "stop" codon, resulting in a truncated protein product




Total disruption of the gene reading frame, no production of protein




Replacement of one amino acid with another in the final gene product - Answer✔✔-Replacing an amino

acid codon with a "stop" codon, resulting in a truncated protein product


What is the function of ribosomes (also known as ribosomal RNA) in protein synthesis?




Serves as a transport molecule able to move a specific amino acid to the site of protein synthesis

(peptide chain elongation) in the correct sequence




Serves as the coordinator mechanism to allow proper reading of the mRNA and placement of the correct

amino acid in the sequence by the tRNAs

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FIRST PUBLISH SEPTEMBER 2024




Allows interpretation of the two strands of DNA to determine which is the "sense" strand and which is

the "antisense" strand




Allows further processing of synthesized proteins (post-translational modification in order to ensure that

the final product is physiologically active) - Answer✔✔-Serves as the coordinator mechanism to allow

proper reading of the mRNA and placement of the correct amino acid in the sequence by the tRNAs


Which of the following is not needed for DNA transcription?




Ribosome


Enzymes


Nucleotides


DNA - Answer✔✔-Ribosome


Frameshift mutations




applies to the reading frame (sequence of codons) being changed.

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