True and False. Chose A if the answer is true; fill in B if the answer it false.

Question

True and False. Chose A if the answer is true; fill in B if the answer it false. In eukaryotes, introns correspond to the protein domain for which they code. Operons are organizational units of prokaryotic DNA that begin with promoter regions. The trip operon controls a series of genes for polypeptides that catabolize the amino acid tryptophan. Replication of viral DNA does not involve proof reading enzymes. T/F This fact makes it likely that virus would mutate faster than do cells. Reverse transcriptase in retroviruses uses viral RNA as a template for DNA synthesis. Epigenetic variation could explain why identical twins vary dramatically in some phenotype. Ribosomes have anticodons that match the mRNA and the t-KNA's codons. Transcription factors and helicase initiate transcription. For most of translation, the polypeptide is held to a tRN A located in the A slot of the ribosome. Proteomics is the study of how a single gene activates many proteins. A newly emerging virus that kill almost all its hosts, will likely die out rather quickly or will survive as a mutated and far less lethal form. The Biocide mutant is one kind of evidence which suggests that a cell's position in the body during morphogenesis is an important factor in regulation of gene expression. Fragments of DNA have been extracted from the remnants of extinct woolly mammoths, amplified, and sequenced. T/F These can now be used to understand the evolutionary relationships among members of related taxa. Ribosomes read 5' rightarrow 3' whereas. RNA polymerase reads 3' rightarrow 5'. Pseudogenes are genes that are not expressed, even though they have nearly identical sequences to expressed genes. Bioinformatics can be used to scan sequences for probable genes looking for start and stop sites for transcription and for translation, for probable splice sites, and for sequences known to be found in other known genes. Upon infection, bacteriophage (viral) DNA is integrated into the chromosome of the host bacteria.

Explanation / Answer

1) false. introns are noncoding part of mRNA

2)False. eukaryotes also have operons.

3)False. The product of Trp operon is tryptophan.

4)False. some DNA-dependent viral polymerases have a nuclease domain with proofreading activity.

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