Which of the statements below does not describe quantitative data?
a) the scientist took soil samples to identify the amounts of sand, clay, and silt in the soil
b) the scientist measured many leaves on the plant and recorded the data
c) the scientist made observations about the color of the plant's leaves
d) the scientist recorded the weather conditions in his notebook the days he studied the plant
Ans: c) the scientist made observations about the color of the plant's leaves
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When blood glucose levels decrease (as between meals), what reserves are tapped first?
a. glycogen b. fats c. proteins d. steroids e. amino acids
Hydropathy analysis of a membrane protein's amino acid sequence predicts the protein's transmembrane segments and orientation in the membrane
It is necessary to confirm those predictions with experimental analysis. One experimental approach for plasma membrane proteins is to use the protease trypsin to digest extracellular domains of these proteins. (Trypsin is hydrophilic and cannot cross the plasma membrane to enter the cell.) When added to cells, trypsin digests the hydrophilic portions of plasma membrane proteins exposed outside the cell into small fragments but will not have access to transmembrane or cytosolic regions of proteins. Design a general experiment using trypsin and SDS-PAGE to address membrane protein association and orientation, and describe specific expected results that would be consistent with the following predicted membrane protein associations and orientations: a. a singlepass integral membrane protein with only its N-terminus exposed on the extracellular surface b. a singlepass integral membrane protein with only its C-terminus exposed on the extracellular surface c. a multipass integral membrane protein with only three hydrophilic loops exposed on the extracellular surface d. a fatty acylated protein e. a GPI-anchored protein What will be an ideal response?
The site where a signal molecule binds to the surface of an enzyme is the ________ site.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a symptom of vitamin A deficiency?
a) severe combined immunodeficiency disease (SCID) b) blindness c) anemia d) fast-flushing e) overstimulation of the immune system