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Exam 8: Gene Expression: The Flow of Information From DNA to RNA to Protein

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Question 21

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Protein synthesis begins with the amino acid ___________ as its codon is the one used as the "start codon" by nearly all organisms.

A) methionine
B) arginine
C) cysteine
D) leucine

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Question 22

Multiple Choice

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A mutation that changes a codon that originally coded for an amino acid into a stop codon is called a

A) frameshift mutation.
B) missense mutation.
C) silent mutation.
D) nonsense mutation.

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Question 23

Multiple Choice

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Mutations that result in much less of a protein or a protein with limited function are known as

Assume that for a given gene a mutation creates an allele that functions as a dominant negative.The gene codes for a protein that forms a trimer within the cell.If at least one of the subunits has the mutant structure the entire protein is inactivated.For a heterozygous individual, what percent of the trimers present in the cell will be inactive?

Which of the following statements is true under ordinary conditions?

How many different amino acids could be coded for using the synthetic mRNA sequence of (5' UGCUGCUGC 3') ?

Transcription occurs in the ________ and translation occurs in the __________ of prokaryotic cells.

Which of these is NOT a character of the genetic code?

Mutations that abolish the function encoded by the wild-type allele are known as

An anticodon is a physical component of a/an _______ molecule.

A bacterial (prokaryotic) ribosome is composed of ______ subunits.

A mutation that occurs when a base is inserted into or deleted from a DNA sequence, completely altering the subsequent amino acid sequence, is called a

The (expressed) sequences within mRNA that code for gene products are called

The sequences within mRNA that are spliced out (removed) are called

A neomorphic dominant mutation in the Antennapedia (Antp) gene of Drosophila causes

Which enzyme forms peptide bonds between adjacent amino acids during polypeptide synthesis?

There are ______________ usually found in the genetic code.

Which of these is NOT a step in transcription?

The appearance of a novel phenotype resulting from the substitution of a single base pair might be due to

A(n) _____________ consists of proteins and small nuclear RNAs forming discrete particles that mediate splicing.