Each of the following is a type of cell surface receptor EXCEPT ____
a. receptor tyrosine kinases
b. enzyme-linked receptors
c. G protein coupled receptors
d. steroid hormone receptors
e. chemically-gated ion channels
D
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The hormone that enhances fruit ripening is ____
Fill in the blank with the appropriate word.
When an organism dies, its muscles remain in a contracted state termed rigor mortis for a brief period of time. Which of the following most directly contributes to this phenomenon?
A. no ATP to move cross-bridges B. no ATP to break cross-bridges between thick and thin filaments C. no calcium to bind to troponin D. no oxygen supplied to muscle E. no energy for the synthesis of actin and myosin
Carnivores must be at or above which trophic level? Explain why
What will be an ideal response?
Altitude sickness
a. results from hypoxia. b. is characterized by hyperventilation. c. is characterized by headaches. d. is characterized by an accelerated heart rate. e. includes all of these.