What was one of the pieces of evidence most critical to the discovery of DNA structure?
A. the hydrogen bonding between different nucleotides
B. its composition of four different nucleotides
C. the discovery of its semi-conservative mode of replication
D. the backbone containing sugar-phosphate linkages
E. an X-ray diffraction pattern suggesting a double helix shape
Answer: E
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Bread is made by mixing flour, water, sugar, and yeast to form dense dough. Why does dough rise?
What will be an ideal response?
According to the most widely accepted hypothesis, the origin of the nuclear genome involved
A. an endosymbiotic relationship between an archaeon and a bacterium. B. an endosymbiotic relationship between two archaeons. C. an endosymbiotic relationship between two bacterium. D. a symbiotic relationship between an archaeon and a bacterium. E. a symbiotic relationship between two archaeons.
Explain the significance of endospores
What will be an ideal response?
The cI (lambda repressor) protein
a. represses the transcription of all other lambda-encoded genes. b. competes with Cro to determine whether a lytic or lysogenic cycle will occur. c. promotes lysogeny. d. does all of the above.