Antibody molecules may function by causing the
A) destruction of complement proteins.
B) agglutination of viruses or bacteria.
C) destruction of B and T cells.
D) crystallization of antigenic particles.
Answer: B
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A. There are too many common ancestors to choose one. B. The last common ancestor of the total group is not known. C. There is not enough molecular sequencing data to determine a root. D. There are not enough synapomorphies to determine a root.
If you look at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells?
A. They form a colony. B. They are oblong in shape. C. They appear to have a cell wall. D. They lack a nucleus.
Because of the formation of Barr bodies, normal human males have ___________ amount of gene products produced by the X-chromosome compared to females.
a) 2 times the b) the same c) 1/2 the d) 1/4 the
Which kingdom is characterized by organisms that are heterotrophic by ingestion?
A. Animal B. Plant C. Fungi D. Protists E. Prokaryotes