Which of the following changes is least likely to arise from a point mutation in a regulatory region of a gene?
(a) a mutation that changes the time in an organism's life during which a protein is expressed
(b) a mutation that eliminates the production of a protein in a specific cell type
(c) a mutation that changes the subcellular localization of a protein
(d) a mutation that increases the level of protein production in a cell
(c) Information for the subcellular localization of a protein is usually encoded within the translated portion of the gene.
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True or False: the amino acids that actively contribute to catalysis in an enzyme do not have to be located adjacent to each other in the primary sequence (the linear sequence of amino acids) of the protein
A. true B. false
A bowl of sugar water is very stable. However, cells can rapidly break down sugar into carbon dioxide and water. What is the best explanation for this observation?
A. Glucose becomes more chemically reactive inside a cell. B. The water is activated by the presence of living cells. C. Enzymes in the cell catalyze the breakdown of glucose. D. Living cells make the water warmer, speeding up the reaction. E. Breakdown of glucose has a negative delta G outside of cells, but a positive delta G inside cells. F. Cells use energy to break down glucose.
Which of the following receptors detect deep transient pressure, and where are they located?
a. Golgi tendon organs, muscle and connective tissues b. hair receptors, hairy skin c. Pacinian corpuscles, deep dermis d. Merkel’s disks, near the base of the epidermis
In which tissue system of plants would you expect to find the guard cells?
A. Vascular tissue system B. Ground tissue system C. Dermal tissue system D. Germ tissue system