7 Amutation results in the conversion of a codon specifying an amino acid to a t

Question

7 Amutation results in the conversion of a codon specifying an amino acid to a termination codo a. nonsense b. frameshift d. missense e. silent 72 ntrons in pre-mRNA: a. code for specific protein domains. b. are spliced out of the message e. move within the mRNA, giving rise to new exon combinations d. protect pre-mRNA from enzyme degradation. e. code for important amino acid sequences 3 RNA synthesis is also known as: a. elongation. b. reverse transcription. c. termination. d. translation. e. transcription Which of the following is a characteristic of uracil? a. It has the ability to bond with adenine. b. It has the ability to bond with guanine. e. It is a purine d. It has the ability to bond with cytosine. Be and Tatum irradiated Neurospora and initiaily grw the mutant stins on complete medium. How were they e to determine the type of mutation for each strain? a. By growing the mold on a complete medium with extra vitamins and nutrients b. By growing the mold on minimal media supplemented with different combinations of amino acids and vitamins c. By growing the mold in its diploid form to see which traits were masked d. By comparing Neurospora to other species of mold atum reach in their studies of Neurospord? . Each mutant gene affected three enzymes. Each mutant gene affected a pair of enzymes. Each mutant gene affected only one enzyme. Mutant genes had no effect on the enzymes produced by the cells. Each mutant gene affected as many enzymes as were present in a particular metabolic pathway. Page?

Explanation / Answer

Answer:

71). A. Nonsense

Explanation: Nonsense mutation is a mutation in which a sense codon that corresponds to one of the twenty amino acids specified by the genetic code is changed to a chain-terminating codon.

72). B. are spliced out of the message

The pre-mRNA must be spliced to remove introns, which do not encode protein sequences

73). E. Transcription

Explanation: Synthesis of mRAN from DNA template strand is called transcription.

74). A. It has the ability to bond with adenine

Explanation:

A=U, A=T & G=C

75). B. By growing the mold on minimal media supplimented with different combinations of amino acids and vitamins.

76). C. Each mutant gene affected only one enzyme.

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