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Which of the following binds to surface-bound C3b during formation of the alternative C3 convertase? 單選: A. Factor D B. C1 C. Factor B D. C2 E. C4 O O O O

Inhibitory receptors on lymphocytes down-regulate immune responses by recruiting protein or lipid phosphatases.BCR signaling on B cells is initiated by antigen binding, leading to mTOR activation. This occurs, for instance, when the antigen is a live microbe that binds to the BCR on the B cells. Which one of the forms of antigen shown below the graph would correctly account for the data shown in the figure?

The S (spike) glycoprotein of coronaviruses can engage receptors by the N-terminal domain, the C-terminal domain, or both. The C-terminal domains of both human SARS coronaviruses bind ACE2 (angiotensin-converting enzyme 2), whereas that of MERS-CoV binds DDP4 (dipeptidyl peptidase 4). In contrast, in mouse hepatitis coronavirus (MHV) the N-terminal domain of S binds CEACAM (cell adhesion molecule 1). You have identified a novel coronavirus with an S protein that displays similarity to MHV at the N terminus and to SARS at the C terminus. What are the molecules most likely to function as receptors and how will you test this?

Acetylcholine acts to contract skeletal muscles, relax heart muscles to slow beating, and release saliva from glands. EXPLAIN multiple explanations that could account for this difference in the response of the cells in terms of MOLECULES with examples from these cell types.

Which of the following would inhibit the function of the JAK-STAT Pathway? Multiple answers    A. Inhibition of protein import into nucleus   B. The Ser/Thr kinase inhibitor Staurosporine   C. Treat cells with Interferon   D. Inhibitors of SH2 domain interactions   E. Drug that causes dimerization of STAT3

Label the nucleus, cytoplasm, and cell membrane of the following pictures. The red one is the human red blood cell under HPO, while the orange one is the toad red blood cell. Describe each cell and compare the two.

When the slime mold receives its own autocrine signal of CAMP the response is the activation of transcription of transmembrane adhesion molecules. These adhesion molecules need to be transcribed, translated and shipped to the plasma membrane. This response is an example of O a endocytosis O b. exocytosis Oc. phagocytosis Od. endosomal recycling

Please answer part b in detail, thanks

Liver cells in culture were kept at 0°C and treated with trypsin to digest the receptors on the cell surface. The temperature was then raised to 37°C and radioactive LDL was added to the culture media. Several hours later, the labeled LDL was found to be inside the cells. This specific process of LDL uptake is A. active transport B. facilitated diffusion C. phagocytosis D. pinocytosis E. receptor-mediated endocytosis