In some G-protein-coupled-receptors, cyclic AMP (cAMP) acts as a(n)
1.first messenger.
2.second messenger.
3.effector.
4.protein kinase.
5.extracellular signal.
2
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Some virus shapes that infect members of Archaea are unique from other viruses that infect eukaryotes and bacteria
Indicate whether the statement is true or false.
Which of the following hormones is indicative of the presence of a developing embryo and thus is the basis of home pregnancy tests?
A. hCG B. progesterone C. estradiol D. FSH E. LH
Humans become infected with tapeworms by ________
a. having sexual intercourse with infected people b. wading in water that is infested with Schistosoma larvae c. drinking untreated water directly from ponds or streams d. eating undercooked beef or fish that contain encysted larvae
A food web is more complicated than a food chain
Indicate whether the statement is true or false