The developing embryo of reptiles, birds, and mammals is encased in the fluid-filled ________ membrane.
A. amniotic
B. embryonic
C. chorionic
D. yolk sac
E. allantois
A. amniotic
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Consider the structure and function of DNA. Which of the following statements is true?
A. Because DNA contains carbohydrates, it provides structural support to the cells. B. The phosphodiester bonds that stabilize the association of the two strands are easily broken and reformed. C. If the sequence of one DNA strand is known, then the sequence of the other strand can be determined. D. Since DNA is made of phosphate groups that are ionized, it could easily pass through a cell membrane.
The solid region of crust and upper mantle is called:
a. the asthenosphere. b. the mantle. c. the lithosphere. d. the outer core. e. the inner core.
According to Patrick Forterre's hypothesis, viruses are ultimately responsible for ________
A) introducing DNA into the ancestors of Bacteria, Archaea, and Eucarya B) fusing with a bacterium and giving rise to the eukaryote nucleus C) introducing information-processing genes into the ancestral chronocytes D) enabling Archaea to withstand extreme environmental conditions causing mass extinctions
Under the Biological Speces Concept, what criterion is used to assign populations of organisms to the same biological species?
A. Being able to interbreed and produce fertile offspring B. A very similar appearance C. Having 99% of their genes in common D. Responding the the environment in the same way