Concept explainers
To determine:
The difference between virus, viroid, and prion.
Introduction:
There is a common thread between these three classes of organisms as all the three: viruses, viroids, and prions are microscopic, infectious particles. Viruses are composed of genetic material DNA or RNA along with a protein capsid and in some instances a lipid envelope. Viroids are circular single stranded RNA molecules known as smallest pathogens.
They affect several plants. Prions refer to infectious particles composed of proteins that can undergo multiple folding patterns and are capable of causing infectious diseases. The name prion is derived from proteinaceous infectious particle. It is an agent that does not depend on genes that involve RNA or DNA for transmission.

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Chapter 28 Solutions
CUSTOMIZED LAB MANUAL FOR BIOLOGY 1407
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- Choose a catecholamine neurotransmitter and describe/draw the components of the synapse important for its signaling including synthesis, packaging into vesicles, receptors, transporters/degradative enzymes. Describe 2 drugs that can act on this system.arrow_forwardThe following figure is from Caterina et al. The capsaicin receptor: a heat activated ion channel in the pain pathway. Nature, 1997. Black boxes indicate capsaicin, white circles indicate resinferatoxin. a) Which has a higher potency? b) Which is has a higher efficacy? c) What is the approximate Kd of capsaicin in uM? (you can round to the nearest power of 10)arrow_forwardWhat is the rate-limiting-step for serotonin synthesis?arrow_forward
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