细胞将蛋白质限定在细胞质膜特的区域的主要方法有:①与细胞外或细胞内蛋白相连;②与气态细胞相连; ③与细胞外糖被相连。 尽管细胞质膜中有许多锚定蛋白, 但膜脂仍能像河流中的水围绕礁石流动一样,围绕膜蛋白流动。
问答题How is an IP3-triggered Ca2+ response terminated
问答题Why does a red blood cell membrane need proteins
问答题Should RGS (regulator of G protein signaling) proteins be classified as GEFs (guanine nucleotide exchange factors) or GAPs (GTPase activating proteins) Explain what role this activity plays in modulating G-protein-mediated responses in animals and yeasts.
问答题Transport by carrier proteins can be either active or passive, whereas transport by channel proteins is always passive. Explain your answer.
问答题The signaling mechanisms used by a steroid-hormone(固醇激素) receptor and by an ion-channel-linked receptor have very few components(组分). Can either mechanism lead to an amplification of the initial signal If so, how
问答题The basic structure of biological membranes is determined by the lipid bilayer, but their specific functions are carried out largely by proteins. Explain your answer.
判断题电镜的波长与电压有关,电压越高,波长越短,分辨率越高。
判断题Because prokaryotic cells have neither mitochondria nor chloroplasts, they cannot carry out either ATP synthesis or photosynthesis.
问答题Discuss the following analogy(相似): “The differences between transporting a ligand by a channel or a carrier protein are like the differences between crossing a river by a bridge or a ferry(摆渡).
问答题EGTA chelates(螯合) Ca2+ with high affinity and specificity. How would microinjection(微注射) of EGTA affect glucagon-triggered breakdown of glycogen (糖原) in liver