Protein X contains four transmembrane domains, a short N-terminus and a long C-terminus. Following protein synthesis, the N-terminus of the protein faces the lumen (the inside) of the ER. After protein X is transported to the cell surface via exocytosis, you would expect the N-terminus of protein X to be
A. extracellular.
B. in the lipid bilayer of the plasma membrane.
C. in the lumen.
D. cytoplasmic.
Answer: A
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In this disease, the mucus-producing lining of
airways become inflamed and excrete excess mucus that becomes colonized by bacteria. This disease is
a. anemia. b. emphysema. c. asthma. d. bronchitis. e. atherosclerosis
Inflammatory responses are orchestrated by the immune system and are part of the body's third line of defense.
Answer the following statement true (T) or false (F)
Which organelle performs cellular respiration?
A) endoplasmic reticulum B) Golgi apparatus C) lysosome D) mitochondrion
Scientists developed the ________ model after their studies of the fossil record revealed that some species appear quite suddenly and then remain essentially unchanged phenotypically for a long period of time.
A. Urey-Miller B. Hardy-Weinberg C. gradualistic D. punctuated equilibrium