To form the blood brain barrier, capillary epithelial cells are sealed together by ____
a. fibronectin
b. collagen
c. gray matter
d. myelin
e. tight junctions
ANSWER: e
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The yellow zone in the tropical middle intertidal owes its color to:
a. sponges. b. boring algae. c. barnacles. d. limpets. e. crabs.
One difference between the erythrocytes of mammals and other vertebrates is:
a. mammal erythrocytes lack nuclei. b. mammal erythrocytes respond to changes in water concentration. c. mammal erythrocytes are oval with swollen centers. d. other vertebrates do not have erythrocytes. e. other vertebrates use a respiratory pigment other than hemoglobin.
Annelids have ___.
a) a coelom b) a pseudocoelom c) no coleom d) none of the above
Answer the following questions true (T) or false (F)
1. Most species of sponges live in freshwater environments, but a few species are marine. 2. Cnidarians such as jellyfish have muscle and nervous tissues. 3. Annelids demonstrate the important animal characteristic of body segmentation.