What are the five stages of a typical infectious disease? During which stage is the host likely to infect others?
What will be an ideal response?
Answer: Infection occurs when the infectious agent invades and propagates in the host. The incubation period occurs just after infection and includes the time when the pathogen has yet to cause disease as well as cause the first (weak) symptoms. The acute period occurs when the disease symptoms are at its peak, and once the symptoms begin to subside it is considered the decline period. Convalescence is the last period of disease progression where the individual regains strength and returns to normal health. The incubation period is the stage in which the host is most likely to infect others, although hosts can often still infect others during the acute period as well. Convalescence is the stage in which many hosts will no longer be infectious.
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Indicate whether each statement is true or false and then provide the explanation for why the statements are either true or false. Receptors for signaling molecules are always integral membrane proteins on the surface of responding cells
What will be an ideal response?
In regions where malaria is prevalent, the S allele is beneficial because:
A. it improves the ability of the hemoglobin to carry oxygen. B. it improves the ability of the immune system to fight Plasmodium, the parasite that causes malaria. C. it causes red blood cells to distort, which makes them less hospitable to Plasmodium, the parasite that causes malaria. D. it prevents mosquitoes from releasing Plasmodium, the mosquito that causes malaria, into the blood. E. None of the answer options are correct.
Insulators exert their effects on gene expression through histone acetyltransferase, histone deacetylase, and RNA polymerase
Indicate whether the statement is true or false
The ________ was developed in the late 1920s by Theodore Svedberg. He originally used it to determine the sedimentation rate of proteins
Fill in the blank with correct word.