Discuss the evolution of the coelom and pseudocoelom. What advantages do coelomate animals have
over acoelomates? What will be an ideal response?
Concepts to Consider: Coelomate animals evolved from acoelomates; pseudocoelomates probably
evolved from more than one type of coelomate animal. The coelom is a body cavity that 1) can be
filled with fluid to form a hydrostatic skeleton, 2) can be divided into parts that can be specialized in
various ways, 3) provides space where internal organs can grow and develop, and 4) can cushion
internal organs.
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An increased number of patients have recently been diagnosed with celiac disease, which you may know of as gluten sensitivity (OMIM 212750)
It is a multifactorial disorder of the small intestine influenced by genes and environment, and it is characterized by malabsorption due to inflammation of the mucosa after eating wheat gluten or related proteins. It is now thought to occur in 1 out of 120 to 300 people. Genes found to be associated with it are in the HLA region of chromosome 6, namely DR3 and DQw2. Which of the following is more probable? A) It is an autoimmune disorder. B) It is caused by exposure to gluten in infancy. C) It has high broad-sense heritability. D) Its frequency varies greatly by population. E) It is found primarily in inbred populations.
Which tissue type includes fat and blood?
A) muscle B) connective C) epithelial D) nervous
Which time period of Earth represents when evolution was progressing at the most rapid rate, as evidenced by fossils
such as those of the Burgess Shale? a. Silurian period b. Cambrian period c. Devonian period d. Ordovician period e. Carboniferous period
Biotic pollution has been particularly harmful to native species:a
in deserts. b. in tundra. c. on islands. d. in tropical rain forests. e. in grasslands.