Which of these animals has a double circulatory system?
A) fish
B) grasshopper
C) dog
D) hydra
C
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In his voyage around the world in the Beagle, what observation did Darwin make about animals?
a. Animals in similar climate zones were similar regardless of where they lived. b. Animals isolated on islands were unlike those living on nearby mainlands. c. Animals living closer together appeared more closely related to each other than to animals living further away. d. Fossils of animals showed characteristics that were unlike any surviving species. e. There appeared to be no genetic connections between any of the animals he observed.
In humans, the term embryo refers to the following period of time: ____
a. from the ninth week after fertilization until birth b. from the eighth week after fertilization until birth c. from fertilization until the ninth week after fertilization d. from 2 to 10 weeks after fertilization e. from 2 to 8 weeks after fertilization
Which of the following environments would be most
likely to produce trees without annual rings? a. tropical rain forest b. northern evergreen forest c. areas with alternating wet and dry seasons d. temperate-deciduous forests e. none of these, because annual rings are characteristic of all trees
Which of the following is not involved in the step that occurs between glycolysis and the Krebs cycle?
A. Coenzyme A attaches to an acetyl group B. decarboxylation of pyruvic acid C. reduction of NAD D. dehydrogenation of pyruvic acid E. pyruvic acid accepts electrons from NADH