What structures in the circulatory system of the vertebrate body have valves? Consider this carefully. Do they function in the same general fashion?
What will be an ideal response?
Veins, lymph vessels, and the heart all have valves. Their common function is to prevent backward flow of blood or lymph fluid.
Analyze and Evaluate the Concepts (Essay)
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Hemophilia is an X-linked recessive gene. A normal woman whose father had hemophilia marries a
normal man. What are the chances of hemophilia in their children? What will be an ideal response?
All members of the seven families for whom Mary Mallon prepared meals developed typhoid fever. Mary did not get sick. This is an example of __________.
A) a sporadic disease B) an opportunistic infection C) a nosocomial infection D) a carrier borne infection
Which of the following is the best definition of sympatric speciation?
A. Species that evolve due to geographical distance B. Mechanical isolation acts to prevent speciation C. Breeding behavior that prevents the organisms from breeding due to differences in their breeding time D. Ecological isolation E. Divergence within a population leads to speciation in the absence of a physical barrier to gene flow.
Which of the following processes occurs in the cytoplasm of a eukaryotic cell?
A. RNA processing, including adding a cap and a tail B. transcription C. translation D. DNA replication