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【单选题】
队列研究属于哪一种流行病学研究方法A.
描述流行病学
B.
分析流行病学
C.
实验流行病学
D.
理论流行病学
E.
临床试验
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反馈参考答案：
举一反三
【单选题】Cells providing the second signal for B cell activation are
A.
Th2
B.
Th1
C.
Dendritic cells
D.
Macrophages
E.
CTL
【判断题】The functions of micronutrients include helping the carbohydrates turn into energy in our cells, providing cushioning and ensuring our cells replicate.
A.
正确
B.
错误
【单选题】The main role of NADPH + H+produced in mature red blood cells is
A.
providing energy
B.
participating in fat synthesis
C.
participating in amino acid synthesis
D.
reducing GSSG to GSH
E.
promoting cholesterol synthesis
【多选题】Proteoglycans perform many sophisticated functions in addition to providing hydrated space around cells. What are their other functions?
A.
They can form gels of varying pore size and charge density that act as filters to regulate the passage of molecules through the extracellular medium.
B.
They can bind secreted growth factors and other proteins that serve as extracellular signals for cells.
C.
They can block, encourage, or guide cell migration through the matrix.
D.
In all these ways, the matrix components influence the behavior of cells, often the same cells that make the matrix—a reciprocal interaction that has important effects on cell differentiation and the arrangement of cells in a tissue.
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