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TLS Online TPP Program
#Question id: 33475
#Unit 2. Cellular Organization
With pulsed-field gel electrophoresis, which can separate DNA molecules up to 107 bp in length. The results of pulsed-field gel electrophoresis of the DNA from the yeast Saccharomyces cerevisiae are shown in Figure. How many chromosomes does S. cerevisiae have?
TLS Online TPP Program
#Question id: 33476
#Unit 2. Cellular Organization
Find true and false statements
A. The structures of eukaryotic genes show extensive variation.
B. Some eukaryotic genes are uninterrupted and their sequences are colinear with those of the corresponding mRNAs.
C. Most multicellular eukaryotic genes are interrupted, but the introns vary enormously in both number and size.
TLS Online TPP Program
#Question id: 33477
#Unit 2. Cellular Organization
Finding: Ancestry have similar organizations with conservation of the positions (of at least some) of the introns.
Example: The globin and DHFR genes are examples of a genes that share a common ancestor
TLS Online TPP Program
#Question id: 33478
#Unit 2. Cellular Organization
Find true and false statements
A. Comparisons of related genes in different species show that the sequences of the corresponding exons are usually conserved
B. when two genes are related, the relationship between their exons is closer than the relationship between their introns.
C. The sequences of the introns are much less similar.
D. Introns evolve much more rapidly than exons because of the lack of selective pressure to produce a polypeptide with a useful sequence.
TLS Online TPP Program
#Question id: 33479
#Unit 2. Cellular Organization
TLS Online TPP Program
#Question id: 33480
#Unit 2. Cellular Organization
Finding: The overall degree of divergence between two homologous exons in related genes corresponds to the differences between the polypeptides.
Reason: Overall degree of divergence between two homologous exons is mostly a result of base substitutions.