Lewin's Genes XII: Chapter 3 Exam Questions With Verified Answers.

Lewin's Genes XII: Chapter 3 Exam Questions With Verified Answers. Alternative Splicing - answerThe production of different RNA products from a single product by changes in the usage of splicing junctions. Cluster Rule - answerRule discovered by Erwin Chargaff that purines tend to cluster on one DNA strand and pyrimidines tend to cluster on the other. As applied to exons, the purines, A and G, tend to be clustered in one DNA strand of the DNA duplex (usually the nontemplate strand) and these are complemented by clusters of the pyrimindines, T and C, in the template strand. Complementary DNA (cDNA) - answere double-stranded DNA that is synthesized from a singlestranded RNA template through a reaction catalyzed by reverse transcriptase. Conventional Phenotype - answerThe effect of a single gene on the organism carrying it, usually as a result of the polypeptide it encodes. First Parity Rule - answerRule discovered by Erwin Chargaff that applies to most regions of DNA whereby base A in one strand of the duplex is matched by a complementary base (T) in the other strand, and base G in one strand of the duplex is matched by a complementary base (C) in the other strand. Rule applies to single bases as well as to dinucleotides, trinucleotides, and oligonucleotides. Fold Pressure - answerThe genome-wide pressure for single-stranded nucleic acid, whether in free form or extruded from duplex forms, to adopt secondary and higher order stem-loop structures. GC Pressure - answerThe tendency of a species' genome to conform to its optimal GC content. GC Rule - answerRule discovered by Erwin Chargaff that the overall proportion of guanine (G) and cytosine (C) in a genome tends to be a species-specific character and that the GC content tends to be greater in exons than in introns. Gene Family - answerA set of genes within a g