The epidermis is made up of epithelial cells which are held tightly together side by side to prevent pathogens from entering the body and to prevent unnecessary water loss. What type of junction holds epithelial cells together to achieve this function?
A) tight junction
B) communicating junction
C) gap junction
D) anchoring junction
Answer: D
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A previously unknown animal is being studied so that it can be classified. It is an invertebrate, triploblastic, dorsoventrally flattened, acoelomate, and has flame cells. Which phylum would you place it in?
A. Platyhelminthes. B. Mollusca. C. Arthropoda. D. Cnidaria.
An __________ consists of an array of organisms along with nonliving components of their
environment. Fill in the blank(s) with the appropriate word(s).
In meiosis II cytokinesis results in the production of
A. two haploid daughter cells. B. four diploid daughter cells. C. four haploid daughter cells. D. two diploid daughter cells. E. one daughter cell identical to the parent cell that underwent meiosis.
As an erythroblast develops into an erythrocyte, it
A) becomes filled with clotting proteins. B) begins to manufacture platelets. C) loses its ability to reproduce. D) takes on the characteristics of an immature monocyte. E) undergoes active aerobic metabolism.