bio 151 Quiz Questions with Complete Solutions

bio 151 Quiz Questions with Complete Solutions Which of the following does NOT describe G-Protein Activation: a. GTP replaces GDP on the alpha subunit b. Separation of the three G Protein subunits c. Receptor mediated endocytosis of the alpha subunit d. Activated alpha subunit binds target proteins - Answer-C Which of the following is NOT an aspect of Tyrosine Kinases: a. Conformational changes in beta subunits activate phosphatases b. Dimerization of cell surface receptors c. Cytoplasmic kinase domains phosphorylate each other on their cytoplasmic tails d. A phosphate group is used from ATP changing it to ADP - Answer-A Which of the following is FALSE: a. The epidermis contains keratinocytes and melanocytes b. The basal lamina is a specialized extracellular matrix connected to the bottom layer of keratinocytes by cell junctions c. The dermis is made up of connective tissue, few fibroblasts and substantial amounts of extracellular matrix d. Only a and c - Answer-D Which of the following is NOT true about the cytoskeleton in eukaryotic cells: a. Contain microtubules made up of α and β subunits b. Contain microfilaments made up of double helix of actin monomers c. Provide structural support and enable the movement of substances within cells d. Contain centrosomes arranged in a helix just below the plasma membrane - Answer-D