While driving down the interstate at rush hour, you get cut off by an 18-wheeler and have to slam on the brakes. In addition to a major case of road rage, you also develop a rapid heart rate and breathing rate. What caused this increase? (Indicate the
branch of the nervous system and neurotransmitters.) What is happening to your digestion at this point?
What will be an ideal response?
The sympathetic branch of the autonomic nervous system has been activated. The neurotransmitter norepinephrine (noradrenalin) is responsible. While this system is active, digestion will be slowed down.
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Smallpox is an enveloped virus with a DNA genome. We have eliminated this once deadly virus through an aggressive worldwide vaccination program. Why might a vaccine be successful with smallpox, but not with HIV?
A. DNA genomes mutate less rapidly than RNA genomes. B. Host cells have RNA in them, and thus do not raise antibodies against RNA. C. RNA is more stable than DNA, and is less likely to be destroyed by the vaccine. D. Viruses with DNA genomes must replicate inside a host cell. E. Smallpox is an enveloped virus.
Homophilic interactions between cells involve interactions
a. among adhesion molecules of the same molecular class. b. among adhesion molecules of different molecular classes. c. between integrins and ICAMs. d. between cadherins and -catenin.
_________ is a nutritive tissue composed of triploid cells in the seeds of flowering plants.
A. Phloem B. Sepal C. Microspore D. Megaspore E. Endosperm
An example of purple photosynthetic bacteria's metabolic flexibility is seen in Rhodospirillum rubrum using a "decision-making" process. When oxygen is present, the bacterium uses fermentation, photoheterotrophy, or photoautotrophy but if oxygen is absent, it switches metabolic pathways to grow chemoorganotrophically.
Answer the following statement true (T) or false (F)