Which of the following is TRUE of short tandem repeat sequences (STRs)?
A. Their length is consistent among different individuals.
B. They can be used for DNA fingerprinting.
C. They are unreliable for use in DNA fingerprinting.
D. Their length is variable among different individuals.
E. Their length is variable among different individuals and they can be used for DNA fingerprinting.
E. Their length is variable among different individuals and they can be used for DNA fingerprinting.
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Which of the following statements about dinosaurs is false?
a. Some species lived in social groups and hunted in packs. b. Dinosaurs were all slow-moving, with relatively low metabolic rates. c. Fossils of dinosaurs with feathers suggest that feathers first evolved to provide insulation. d. Dinosaur social behaviors include courtship rituals and parental nurturing of the young. e. Dinosaurs underwent an extensive radiation throughout the Jurassic and Cretaceous periods.
Endochondral ossification step 5
What will be an ideal response?
What happens during countercurrent exchange in fishes?
A) Gas exchange occurs as blood and water move in opposite directions across a respiratory surface. B) Gas exchange occurs as blood and water move in the same direction across a respiratory surface. C) Oxygen enters the blood by diffusion, and carbon dioxide exits the blood by active transport. D) Oxygen enters the blood by active transport, and carbon dioxide exits the blood by diffusion. E) Oxygen and carbon dioxide move in opposite directions across the respiratory surface by facilitated diffusion.
Frederick Griffith discovered
A) transformation. B) transposons. C) the lac operon. D) DNA. E) conjugation.