Newborn humans face thermoregulatory challenges as do small mammals. One mechanism they use to generate heat is ______ in "brown fat."
A. shivering thermogenesis
B. nonshivering thermogenesis
C. convection
D. evaporation
E. radiation
B. nonshivering thermogenesis
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The decline of MPF activity at the end of mitosis is due to _____
A) the destruction of the protein kinase Cdk B) decreased synthesis of Cdk C) the degradation of cyclin D) the accumulation of cyclin E) synthesis of DNA
You have been a sample of Mimivirus, which has the largest capsid diameter of all currently known viruses (600 nm) and is hexagon shaped (icosahedral). Based on your knowledge of microscopes, what would you be able to see/determine about mimiviral structure using each of the following microscopes?
a. simple compound (light) microscope b. fluorescent microscope using fluorescently labeled antibodies to a novel capsid protein c. magnetic resonance force microscope
Before an animal cell’s membrane fuses with a virus, the virus must first:a
duplicate its DNA. b. use enzymes of the plasma membrane to break down its capsid. c. replicate itself to attack numerous sites of the plasma membrane. d. extend its tail fibers to sense the plasma membrane of the host cell. e. attach to a specific receptor on the plasma membrane of the host cell.
Which of the following human activities has virtually no impact on natural ecosystems?
A) irrigation of cultivated fields B) application of fertilizers to cultivated fields C) shrimp farming along tropical coastlines D) damming of rivers E) All of the above activities have potentially serious impacts on natural systems.