Receptor Mediated endocytosis:
A. is involved in receptor recycling
B. involves cell membrane fusion
C. can involve the protein clatherin
D. can induce a refractory period for signal transduction
E. all of the above
Ans: E. all of the above
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The accompanying figure shows the electron transport chain. Which of the following is the combination of substances that is initially added to the chain?
A) oxygen, carbon dioxide, and water B) NAD+, FAD, and electrons C) NADH, FADH2, and protons D) NADH, FADH2, and O2 E) oxygen and protons
A person who has a constant need to eat may show impaired secretion of or response to
A. growth hormone B. insulin C. thyroid hormone D. leptin E. thyroid-stimulating hormone
Hybrid organisms produced from a cross between
two pure-breeding organisms belong to which generation? a. P1 b. G1 c. A1 d. F1 e. F2
Allopatric speciation is most commonly caused by
a. geographical distance. b. the unattractiveness of the females. c. a heavy parasite load. d. rapid genetic exchange over long distances. e. increased genetic drift.