9. Researchers cultured embryonic liver cells on a synthetic surface that lacked extracellular matrix (ECM) proteins. Although growth factors were present, the cells failed to activate several genes normally expressed during liver development. Which type of membrane protein is most likely required for transmitting signals from the ECM to the nucleus? (A) Integrins (B) Fibronectins (C) Actin microfilaments (D) Receptor tyrosine kinases

9. Researchers cultured embryonic liver cells on a synthetic surface that lacked extracellular matrix (ECM) proteins. Although growth factors were present, the cells failed to activate several genes normally expressed during liver development. Which type of membrane protein is most likely required for transmitting signals from the ECM to the nucleus?
(A) Integrins
(B) Fibronectins
(C) Actin microfilaments
(D) Receptor tyrosine kinases

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統計： A(0), B(0), C(0), D(1), E(0) #3981180

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解題核心觀念本題測驗的是細胞與細胞外...

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16. Nucleotides can be radiolabeled before they are incorporated into newly forming DNA and, therefore, can be assayed to track their incorporation. In a set of experiments, a student-faculty research team used labeled T nucleotides to study the incorporation of labeled nucleotides into a culture of lymphocytes. They found that the lymphocytes incorporated the labeled nucleotide at a significantly higher level after a pathogen was introduced into the culture. What might they conclude from this observation? (A) The pathogen consumed radiolabeled nucleotides. (B) Infection causes lymphocytes to divide more rapidly. (C) Infection causes lymphocytes to increase in size. (D) Infection causes lymphocyte cultures to skip some parts of the cell cycle.

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