In the Watson-Crick model of DNA structure, the polynucleotide chains are
A. of unequal length.
B. both oriented in the same direction.
C. arranged with the bases on the outside.
D. built with the nucleotides as the backbone.
E. oriented in opposite directions.
E
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Many cases of epigenetic modification involve adding a methyl group to the DNA in promoters, a process called ____________________
Fill in the blank(s) with correct word
The c-Flip protein, a protein involved in mediating the cell-death pathway, comes in two forms: long (c-FLIPL) and short (c-FLIPS). Both forms appear to be involved in controlled apoptosis in normal cells. However, in colon cancer, the expression of c-FLIPL is associated with what notable characteristic?
a. death of cells surrounding the dying cell b. lesion formation and buildup of extracellular waste products c. increased cell growth d. replication of the genetic material without progression through mitosis
Gene flow between organisms of ring species occurs
a. between any of the organisms if they are placed in the same environment. b. freely. c. never. d. only between intermediary populations. e. only under laboratory conditions.
In humans, which genetic mechanism led to the formation of the X and Y chromosomes?
A. Translocation B. Nondisjunction C. Inversion D. Reduced crossing over E. Insertion