Which of the following is made primarily of protein?
A. skin
B. tendon
C. enzyme
D. carbohydrates
C. enzyme
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Which type of signal receptor does NOT generally involve transduction of a signal with the transfer of a phosphate group? (Select all correct choices.)
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
Prolactin, oxytocin, and estrogen exhibit which type of hormone interaction?
a. synergistic b. permissive c. opposing d. unrelating e. mutual
A protein normally synthesized in fat cells; it is thought to act as a negative feedback signal normally released by fat stores to decrease appetite and increase fat metabolism
What will be an ideal response?
Which of the following are important in breaking down organic material in fertile topsoil?
A) rock particles B) humus and cations C) bacteria and fungi D) plant roots