Which scientists are credited for deducing the true structure of DNA?
A. Rosalind Franklin
B. Erwin Chargaff and Oswald Avery
C. Martha Chase and Frederick Griffith
D. James Watson and Francis Crick
Answer: D
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The condition that develops on a previously damaged heart valve is called
A. an aneurysm. B. acute bacterial endocarditis. C. myocarditis. D. subacute bacterial endocarditis.
A normal red blood cell count range is __________
per microliter. a. 3,000–6,750 b. 20,000–100,000 c. 250,000–300,000 d. 1.6–3.2 million e. 4.8–5.4 million
What is the main reason that mammals underwent adaptive radiation after the demise of the dinosaurs?
A. The mammals had little competition so it was easier for them to evolve into the niches that were once occupied by the dinosaurs. B. They had an "inner need" to become better suited to their environment. C. They had to adapt in order to physically survive the ice age. D. No answer choice is correct.
Bergey’s Manual of Determinative Bacteriology bases classification on:
A. Geographic origin B. rRNA C. Phenotype D. Genotype