How does a shark's cardiovascular system differ from that of a mammal?
A) The shark's heart does not directly pump oxygenated blood to the systemic tissues.
B) The shark's heart receives both oxygenated and deoxygenated blood.
C) The shark's circulatory system has a pulmonary and a systemic circuit.
D) The shark's blood is pumped through open-ended tubes.
A
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In an inflammatory response, the direct effect of histamine is to ____
a. dilate blood vessels causing increased blood flow to the area of infection b. decrease heat accumulation in the area of infection c. directly kill bacteria d. attack cytotoxic T cells e. cause B cells to release antibodies
The nucleolus
A) is surrounded by a thin nucleolar membrane. B) is found in prokaryotes. C) contains tRNA. D) synthesizes ribosomal RNA. E) is found in prokaryotes and contains tRNA and rRNA.
Each branch of an evolutionary tree represents _____.
a. a mutation b. a speciation event c. multiple speciation events d. a single individual e. an environmental pressure
Which of the following statements about generalized transduction is false?
A. Generalized transduction always involves lytic phage. B. "Headfull" packaging always places only phage DNA into the phage head during phage packaging in generalized transduction. C. Generalized transduction can be used to map bacterial genes. D. Two recombination events are necessary to integrate the transferred DNA during generalized transduction. E. Genes that are close together on the bacterial chromosome will have a relatively large cotransduction frequency.