#Question id: 15726
#Unit 12. Applied Biology
#Question id: 1219
#Unit 4. Cell Communication and Cell Signaling
Many G protein-coupled receptors contain seven transmembrane α-helical domains. The amino end of the protein lies at the exterior of the plasma membrane. Loops of amino acids connect the helices either at the exterior surface or on the cytosolic surface of the membrane. The loop on the cytosolic side between helices 5 and 6 is usually substantially longer than the others. Where would you expect to find the carboxyl end of the protein?
#Question id: 33521
#Unit 2. Cellular Organization
#Question id: 10533
#Unit 2. Cellular Organization
Following statements are regarding to the fluidity of a bilayer.
A. A lipid bilayer cools below a characteristic transition temperature, it undergoes a sort of phase change in which it becomes a liquid; that is, it loses its fluidity.
B. Above the transition temperature, the highly mobile lipids are in a state known as a liquid crystal.
C. The bilayer is thicker in the gel state than in the liquid crystal state due to the stiffening of the hydrocarbon tails at lower temperatures.
D. The transition temperature of a bilayer decreases with the chain length and the degree of saturation of its component fatty acid residues for the same reasons that the melting points of fatty acids increase with these quantities.
Which of the following combination is correct?
#Question id: 10243
#Unit 10. Ecological Principles
A group of species that potentially compete with one other for a resource, such as insect- eating birds, is called a