If one strand of a DNA double helix has the sequence ATCCGA, what is the sequence of the other strand?
A) ATCCGA
B) TAGGCT
C) AGCCTA
D) UAGGCU
B) TAGGCT
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Echinoderms are members of the Bilateria but many members of the group (e.g., the sea stars) lack a brain, have no specialized sense organs, and have radial nerves that extend down each "arm" from a central nerve ring that surrounds the gut
What was a likely selective pressure in the evolution of this type of nervous system? A. ability to move forward B. role as a predator in the ecosystem C. multicellularity D. possession of an endoskeleton of calcium carbonate E. None of the above.
Which statement is true?
a. Haversian canals allow veins and arteries to pass through muscle tissue. b. Canaliculi help to maintain body temperature and protect internal organs. c. Trabeculae are plates that provide structural support to spongy bone tissue. d. Osteoclasts are mutated bone cells that injure the organism by destroying bones.
An environment that favors individuals with intermediate phenotypes results in what type of selection?
a. gradual b. punctuated c. disruptive d. directional e. stabilizing
The oldest fossils
a. demonstrate the widest distribution. b. represent the most highly evolved organisms. c. are found buried deeper in the ground than more modern forms. d. are found in Africa. e. are primitive marine vertebrates.