Four of the following are major features of arthropods. Which is the exception?
A. Jointed appendages
B. Exoskeleton
C. Paired segmental nephridia
D. Specialized segments that are fused together
E. Specialized sensory structures
Answer: C
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Some observations have suggested to researchers that substances associated with the extracellular matrix may be involved in cell migration. This has been observed with the cell marker CD44 on the surface of cancer cells and their ability to be separate from one another and to easily metastasize to other regions of the body. This is most likely due to the interaction of CD44 and
A) chondrotin sulfate. B) ICAMs. C) hyaluronate. D) fibronectins. E) elastin.
The nuclear membrane functions as a
A) means of separating nuclear and cytoplasmic constituents. B) means of localization of the chromosomes within the cell. C) selective barrier, allowing certain substances in or out. D) means of sequestering many of the mRNA processing activities from the cytosol. E) all of the above
The antibody that is predominantly found in tears, saliva, and intestinal secretions is:
a. IgG. b. IgA. c. IgM. d. IgE.
Interspersed repeated DNA
A) constitutes 25%–40% of most mammalian genomes. B) is located in one region of most mammalian genomes. C) is approximately 105–107 bp in length for each repeat. D) can be classified into gene families, such as the Alu family. E) constitutes 20%–40% of most mammalian genomes and can be classified into gene families, such as the Alu family.