Areas with upwelling support the greatest biomass of plankton
Indicate whether the statement is true or false
true
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Goiter is a disease characterized by an enlarged thyroid gland. Which of the following either leads to or is an outcome of the disease?
A. iodine deficiency in the diet B. reduced levels of T3 in the blood C. reduced levels of T4 in the blood D. excessive thyroid-stimulating hormone production E. All of the choices are correct.
A common second messenger molecule is
a. a steroid compound. b. cyclic AMP. c. ADP. d. prostaglandin. e. intermedin.
In a well-mixed estuary, river flow is ____ tidal currents
a. greater than b. less than c. perpendicular to d. equal to
All of the following are true about HIV EXCEPT
A. HIV contains an enzyme called reverse transcriptase. B. cDNA precedes double-stranded DNA. C. HIV carries RNA as its genetic material. D. HIV must reproduce immediately upon entering a host cell because it cannot survive a latent period.