FRAP has revealed that some proteins move in cell membranes much slower than they move in reconstituted liposomes. Which of the following could account for limited mobility of proteins in cell plasma membranes?
A) association with other proteins in a large complex.
B) association with lipid rafts.
C) anchorage to the extracellular matrix.
D) anchorage to the cell cytoskeleton.
E) All could limit protein mobility.
Answer: E
You might also like to view...
The extracellular matrix (ECM) affects a cell that it surrounds in which ways? (Select all correct choices.)
A. The ECM affects the shape that the cell takes, depending on the structure and composition of the extracellular matrix. B. The ECM affects the genes that the cell expresses, depending on the types of fibrous proteins in the extracellular matrix. C. The ECM affects the size that the cell grows to, depending on the polysaccharides in the extracellular matrix. D. The ECM has no effect on the cells that it surrounds. E. All of these choices are correct.
Suppose there is a mutation in a laminin-binding integrin gene that causes a loss of function in the cytoplasmic domains of the integrin. Which of the following would you expect to observe as a result of this mutation?
A. The integrin would be unable to signal the cytoplasm when it had bound to laminin. B. The integrin would function normally because the cytoplasmic domain is not responsible for binding to laminin. C. The strength of tissues would be decreased because the integrin could no longer associate with microfilaments in adherens junctions. D. Cell adhesion to laminin would decrease, but laminin-meditated gene expression would remain the same.
Considering the traits in the previous question, which alleles separated at which stages of meiosis? Comments: This can be used against common errors in thinking about phenotypic ratios and meiosis
A. Red segregated from brown in meiosis I, and straight segregated from curled in meiosis II. B. Red segregated from brown in meiosis II, and straight segregated from curled in meiosis I. C. Red segregated from brown in meiosis I, and straight segregated from curled in meiosis I. D. Red segregated from brown in meiosis II, and straight segregated from curled in meiosis II. E. Red segregated from straight in meiosis I, and brown segregated from curled in meiosis II.
Human chorionic gonadotropin stimulates the corpus luteum to secrete
a. FSH. b. LH. c. testosterone. d. progesterone. e. estrogen and progesterone.