Date Indicate the answer choice that best completes the statement or answers the

Question

Date Indicate the answer choice that best completes the statement or answers the question 1. It was recently discovered that AUG is not always the start codon in which of the following systems? a. viruses b. mammalian immune system proteins c. mitochondria d. all of these 2. The final form of mRNA in eukaryotes has all these features, exeept: a. There will be a special nucleotide cap on the S' end of the mRNA. b. There is usually a poly A tail on the 3' end of the mRNA. c. The mature, active mRNA contains introns. d. Only a single protein is made from any mature mRNA molecule. e. All of these are true. 3. Inosine or hypoxanthine can wobble with all the following bases, except a. A b. C c. T d. U e. Inosine can wobble with all of these bases. --4. In the wobble phenomenon, the base that wobbles is found in a. the tRNA. b. the mRNA c. either the tRNA or the mRNA. 5. What type of assay using tRNAs and ribosomes enabled complete determination of the genetic code? a. filter binding assays b. high performance chromatography c. electrophoresis d. density gradient centrifugation 6. Ribosomal frameshifting in Influenza Virus A is caused by the fact that a. the virus has a modified genetic code b. the virus attacks the mRNA c. the ribosome reaches a rare arginine codon and stalls out d. none of these

Explanation / Answer

Answer:

1). D. All of these

Alternative start codons are different from the standard AUG codon and are found in both prokaryotes (bacteria & viruses) and eukaryotes (mammalian immune system & mitochondrial genome)

2). C. The mature, active mRNA contains introns

Introns are noncoding sections of an RNA transcript, or the DNA encoding it, that are spliced out before the RNA molecule is translated into a protein. The sections of DNA (or RNA) that code for proteins are called exons.

3). C. T

A wobble base pair is a pairing between two nucleotides in RNA molecules that does not follow Watson-Crick base pairrules. The four main wobble base pairs are guanine-uracil (G-U), hypoxanthine-uracil (I-U), hypoxanthine-adenine (I-A), and hypoxanthine-cytosine (I-C).

4). A. The tRNA

Some tRNAs bind to multiple codons, which is called wobble.

5). A. Filter binding assays

The filter binding assay was used to quantitate the tRNA.

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