Without data from the base composition studies of Chargaff, what might Watson and Crick’s modeling studies have erroneously concluded?
A. Bases could pair with themselves (e.g. A with A, C with C).
B. Any purine could pair with any purine.
C. Any pyrimidine could pair with any pyrimidine.
D. Any purine could pair with any purine and any pyrimidine could pair with any pyrimidine.
E. Any purine could pair with any pyrimidine.
E. Any purine could pair with any pyrimidine.
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All of the following bones are part of the appendicular skeleton except the ________
a. pelvic girdle b. humerus c. tibia d. vertebral column
What causes the formation of a polyribosome in prokaryotic transcription?
a. initiation of transcription and the formation of the transcription bubble b. termination of transcription when polymerase stalls in the A-T-rich regions c. multiple instances of translation on the same mRNA d. binding of polymerase to the promoter region
In northern Minnesota, the lynx (Lynx canadensis) habitat overlaps the bobcat (Lynx rufus) habitat. The two can breed and produce healthy, fertile offspring, which could lead to
A) extinction of one or both species. B) hybrid infertility. C) gametic incompatibility. D) hybrid inviability. E) geographic isolation.
Which of the following is not a feature common to most animals?
a) development into a fixed body plan b) asexual reproduction c) specialized tissues d) heterotrophic nutrient sourcing