Question 1

To which part on a tRNA would an amino acid attach during tRNA charging?

Accepted Answer

A)   3' acceptor arm
B)   anticodon arm
C)   T Ψ\PsiΨ C arm
D)   DHU arm
E)   extra arm

Question 2

Critique the idea that the information needed to encode a particular polypeptide always resides within a single gene.

Accepted Answer

The idea that the information needed to ...

Question 3

siRNAs and miRNAs function in which of the following processes?

Accepted Answer

A)   transcription
B)   translation
C)   RNA interference
D)   RNA editing
E)   RNA splicing

Question 4

Below is a list of steps in the processing of ribosomal RNAs. Please select the choice that lists the steps in the CORRECT sequential order. 1. Methyl groups added to specific bases and the 2'-carbon atom of some ribose sugars
2)  Transcription of the rRNA precursors from DNA
3)  Cleavage of precursor rRNA
4)  Individual rRNA molecules ready for ribosome assembly
5)  Trimming of precursor rRNA

Accepted Answer

A)   3, 1, 2, 5, 4
B)   2, 3, 4, 5, 1
C)   4, 2, 3, 1, 5
D)   1, 3, 5, 4, 1
E)   2, 1, 3, 5, 4

Question 5

For a time, a gene was defined as a sequence of DNA that encodes a polypeptide. Critique this outdated notion of what a gene is and propose a more comprehensive definition.

Accepted Answer

The traditional definition of a gene as ...

Question 6

Devise a strategy to prove that splicing occurs in the nucleus.

Accepted Answer

To prove that splicing occurs in the nuc...

Question 7

The calcitonin gene can encode either the hormone calcitonin or a protein called calcitonin-gene-related peptide depending on which 3' cleavage site is used. In the thyroid gland, cleavage and polyadenylation occur after the fourth exon leading to calcitonin production. However, in the brain, the exact same transcript is cleaved after the sixth exon yielding calcitonin-gene-related peptide. This is an example of:

Accepted Answer

A)   multiple capping.
B)   alternative RNA processing.
C)   polyadenylation.
D)   environmental influence.
E)   mutation.

Question 8

Which of the following regulatory RNA types is different from the rest in terms of its length?

Accepted Answer

A)   siRNA
B)   crRNA
C)   miRNA
D)   piRNA
E)   lncRNA

Question 9

Which of the following observations supports the notion that the gene is simply a set of DNA sequences that are transcribed into a single RNA molecule that encodes a single polypeptide?

Accepted Answer

A)   Alternative splicing-a single gene can yield multiple mRNA and protein products.
B)   A single ribosomal RNA transcript can liberate several RNA molecules via further processing.
C)   RNAs can be the functional product of a gene without being translated into a protein product.
D)   Within a protein coding region, each codon represents a specific amino acid that will be linked to form a polypeptide.
E)   Regulatory elements are part of a gene that regulate timing, degree, and specificity of gene expression but are not transcribed.

Question 10

Which of the following statements about ribosomes and ribosomal RNA is NOT true?

Accepted Answer

A)   Ribosomes typically contain about 80% of the total cellular RNA.
B)   Ribosomal RNA is processed in both prokaryotes and eukaryotes.
C)   In eukaryotes, genes for rRNA are usually present within tandem repeats.
D)   Each ribosomal RNA component is encoded by a separate gene.
E)   In eukaryotes, the rRNA transcripts are processed further by snoRNAs within the nucleus.

Question 11

Below is a list of steps of eukaryotic pre-mRNA processing. Please select the choice that lists the steps in the CORRECT sequential order. 1. Recognition and binding the 3' AAUAAA sequence by specific protein factors
2)  Cleavage at the poly(A)  site
3)  Addition of the 5' cap
4)  Export to the cytoplasm
5)  Addition of the poly(A)  tail

Accepted Answer

A)   3, 1, 2, 5, 4
B)   2, 3, 4, 5, 1
C)   4, 2, 3, 1, 5
D)   1, 3, 5, 4, 1
E)   5, 4, 1, 3, 2

Question 12

Explain how RNA editing violates a general principle of molecular genetics.

Accepted Answer

RNA editing violates a general principle...

Question 13

Which of the following intron types requires spliceosomes for removal?

Accepted Answer

A)   group I intron
B)   group II intron
C)   group III intron
D)   nuclear pre-mRNA
E)   tRNA

Question 14

The 5' cap on an mRNA is important for all the processes listed below except for the _____ of an mRNA molecule.

Accepted Answer

A)   transcription
B)   intron removal
C)   stability
D)   initiation of translation
E)   ribosomal interaction

Question 15

A microbiologist isolated a mutant strain of E. coli that is extremely susceptible to bacteriophage infection, by a wide range of bacteriophages. Which of the following genes might she explore as a possible site of the mutation that results in this phenotype?

Accepted Answer

A)   A gene that encodes a small nucleolar RNA
B)   A gene that encodes a Cas protein
C)   A gene that encodes a Piwi-interacting RNA
D)   A gene that encodes either a miRNA or a siRNA
E)   A gene that encodes an immune RNA

Question 16

Devise and describe a strategy to conduct a pulse-chase experiment to determine if newly transcribed eukaryotic RNA actually moves from the nucleus to the cytoplasm.

Accepted Answer

To conduct a pulse-chase experiment to d...

Question 17

Which of the following nitrogenous bases is frequently modified enzymatically to become a rare type of nitrogenous base in tRNA?

Accepted Answer

A)   adenine
B)   uracil
C)   thymine
D)   cytosine
E)   guanine

Question 18

Which of the following elements would NOT be found in an mRNA molecule?

Accepted Answer

A)   protein-coding region
B)   3' untranslated region
C)   5' untranslated region
D)   promoter
E)   start and stop codons

Question 19

Anticodons are found in _____ molecules.

Accepted Answer

A)   mRNA
B)   tRNA
C)   rRNA
D)   snRNA
E)   miRNA

Question 20

If a splice site were mutated so that splicing did not take place, what would be the effect on the amino acid sequence?

Accepted Answer

A)   It would be shorter than normal.
B)   It would be longer than normal.
C)   It would be the same length but would encode a different protein.
D)   It would be unable to fold into its correct structure.
E)   It depends on the mutant mRNA sequence.

Exam 14: Rna Molecules and Rna Processing

Which of the following observations supports the notion that the gene is simply a set of DNA sequences that are transcribed into a single RNA molecule that encodes a single polypeptide?

Correct Answer
verified

Correct Answer
verified

Anticodons are found in _____ molecules.

Correct Answer
verified

Which of the following statements about ribosomes and ribosomal RNA is NOT true?

Correct Answer
verified

Which of the following elements would NOT be found in an mRNA molecule?

Correct Answer
verified

If a splice site were mutated so that splicing did not take place, what would be the effect on the amino acid sequence?

Correct Answer
verified

Devise and describe a strategy to conduct a pulse-chase experiment to determine if newly transcribed eukaryotic RNA actually moves from the nucleus to the cytoplasm.

Correct Answer
Answered by ExamLex AI
To conduct a pulse-chase experiment to d...
View Answer

A microbiologist isolated a mutant strain of E. coli that is extremely susceptible to bacteriophage infection, by a wide range of bacteriophages. Which of the following genes might she explore as a possible site of the mutation that results in this phenotype?

Correct Answer
verified

For a time, a gene was defined as a sequence of DNA that encodes a polypeptide. Critique this outdated notion of what a gene is and propose a more comprehensive definition.

Correct Answer
Answered by ExamLex AI
The traditional definition of a gene as ...
View Answer

Devise a strategy to prove that splicing occurs in the nucleus.

Correct Answer
Answered by ExamLex AI
To prove that splicing occurs in the nuc...
View Answer

The 5' cap on an mRNA is important for all the processes listed below except for the _____ of an mRNA molecule.

Correct Answer
verified

Correct Answer
verified

Which of the following regulatory RNA types is different from the rest in terms of its length?

Correct Answer
verified

Explain how RNA editing violates a general principle of molecular genetics.

Correct Answer
Answered by ExamLex AI
RNA editing violates a general principle...
View Answer

Correct Answer
verified

Which of the following intron types requires spliceosomes for removal?

Correct Answer
verified

To which part on a tRNA would an amino acid attach during tRNA charging?

Correct Answer
verified

siRNAs and miRNAs function in which of the following processes?

Correct Answer
verified

Critique the idea that the information needed to encode a particular polypeptide always resides within a single gene.

Correct Answer
Answered by ExamLex AI
The idea that the information needed to ...
View Answer

Which of the following nitrogenous bases is frequently modified enzymatically to become a rare type of nitrogenous base in tRNA?

Correct Answer
verified

Exam 14: Rna Molecules and Rna Processing

Which of the following observations supports the notion that the gene is simply a set of DNA sequences that are transcribed into a single RNA molecule that encodes a single polypeptide?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Anticodons are found in _____ molecules.

Correct AnswerverifiedShow Answer

Which of the following statements about ribosomes and ribosomal RNA is NOT true?

Correct AnswerverifiedShow Answer

Which of the following elements would NOT be found in an mRNA molecule?

Correct AnswerverifiedShow Answer

If a splice site were mutated so that splicing did not take place, what would be the effect on the amino acid sequence?

Correct AnswerverifiedShow Answer

Devise and describe a strategy to conduct a pulse-chase experiment to determine if newly transcribed eukaryotic RNA actually moves from the nucleus to the cytoplasm.

Correct AnswerAnswered by ExamLex AITo conduct a pulse-chase experiment to d...View AnswerShow Answer

A microbiologist isolated a mutant strain of E. coli that is extremely susceptible to bacteriophage infection, by a wide range of bacteriophages. Which of the following genes might she explore as a possible site of the mutation that results in this phenotype?

Correct AnswerverifiedShow Answer

For a time, a gene was defined as a sequence of DNA that encodes a polypeptide. Critique this outdated notion of what a gene is and propose a more comprehensive definition.

Correct AnswerAnswered by ExamLex AIThe traditional definition of a gene as ...View AnswerShow Answer

Devise a strategy to prove that splicing occurs in the nucleus.

Correct AnswerAnswered by ExamLex AITo prove that splicing occurs in the nuc...View AnswerShow Answer

The 5' cap on an mRNA is important for all the processes listed below except for the _____ of an mRNA molecule.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following regulatory RNA types is different from the rest in terms of its length?

Correct AnswerverifiedShow Answer

Explain how RNA editing violates a general principle of molecular genetics.

Correct AnswerAnswered by ExamLex AIRNA editing violates a general principle...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Which of the following intron types requires spliceosomes for removal?

Correct AnswerverifiedShow Answer

To which part on a tRNA would an amino acid attach during tRNA charging?

Correct AnswerverifiedShow Answer

siRNAs and miRNAs function in which of the following processes?

Correct AnswerverifiedShow Answer

Critique the idea that the information needed to encode a particular polypeptide always resides within a single gene.

Correct AnswerAnswered by ExamLex AIThe idea that the information needed to ...View AnswerShow Answer

Which of the following nitrogenous bases is frequently modified enzymatically to become a rare type of nitrogenous base in tRNA?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
To conduct a pulse-chase experiment to d...
View Answer

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The traditional definition of a gene as ...
View Answer

Correct Answer
Answered by ExamLex AI
To prove that splicing occurs in the nuc...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
RNA editing violates a general principle...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The idea that the information needed to ...
View Answer

Correct Answer
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