Compare and contrast internal transportation as conducted by an open and closed circulatory system. Also, identify
two animals representative of each type of circulatory system. What will be an ideal response?
Open and closed circulatory systems each provide a mechanism for the internal transport of
materials through the animal body. In open circulatory systems (found in arthropods and
most mollusks), the heart pumps blood (specifically hemolymph) into vessels that have open ends. The hemolymph spills into cavities collectively called the hemocoel. In the hemocoel
the hemolymph bathes the cells and then re-enters the circulatory system through openings in
the heart or through opened-ended vessels. In closed circulatory systems (found in annelids,
echinoderms, and vertebrates), the blood flows through a continuous system of vessels; a
hemocoel is absent. Nutrients, gases, and wastes leave the vessels through thin-walled
capillaries.
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Dandelions, Taraxacum officinale, are plants that produce fruitlike propagules that are actually produced asexually. Sexual reproduction is very rare in this organism. Which species concept would be least useful in defining dandelions as a species?
A. Phylogenetic species concept. B. Biological species concept. C. Evolutionary species concept. D. Ecological species concept. E. Both the evolutionary and ecological species concepts.
Testing for differentiation of M. nonliquefaciens and M. osloensis can best be performed by:
a. the ability to utilize acetate. b. the ability to liquefy serum. c. glucose utilization tests. d. growth on MacConkey agar.
The diploid number of chromosomes on a human skin cell is 46. What is the number of chromosomes found in a human egg cell?
A) 92 B) 12.5 C) 23 D) 46 E) 184
What is false about the end of meiosis 1?
What will be an ideal response?