Many integral membrane proteins have not been analyzed by X-ray crystallography. However, transmembrane segments can be inferred using computer analysis of the amino acid sequence of the protein. This technique is known as
A) homeoviscous adaptation.
B) lipid analysis.
C) lipid rafting.
D) hydropathic analysis.
E) SDS-PAGE.
D) hydropathic analysis.
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What is the role of interferons?
a. Protecting cells against viral infections b. Engulfing and digesting pathogens c. Producing inflammatory molecule d. Killing viral and cancerous cells
The cell that participates in both the innate and adaptive defense by presenting antigens to activate helper T cells is the
A. B cell. B. T cell. C. macrophage. D. plasma cell. E. chondrocyte.
The insects in the diagram above represent all of the following except
A. herbivores.
B. the second trophic level.
C. primary consumers.
D. producers.
A major function of tight junctions is to
a. create strong cell-cell adherence. b. promote the intermixing of proteins between the apical and basolateral surfaces of cells. c. seal the space between adjacent cells to provide, for example, a barrier to sugar diffusion across an epithelial cell layer. d. sort cells on the basis of adhesion during cell migration in embryos.