Disadvantages of active transport?
Answer: Disadvantages: Energy cost and more complex proteins required.
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Which of the following is NOT a part of the MAP kinase pathway? (Select all correct choices.)
A. A receptor kinase is activated by binding to a growth factor and phosphorylates receptor cytoplasmic domains. B. The activated receptor kinase dimer activates the RAS protein to bind to a GTP. C. The activated RAS protein activates protein kinases in the signal-transduction pathway. D. A series of protein kinases amplify the signal to the nucleus where genes responsible for cell division are switched on. E. A pyrophosphatase enzyme terminates the cellular response.
Testing a cancer chemotherapy drug for safety before it is approved for marketing is an example of what general type of science?
a. basic b. expedited c. applied d. conclusive
A restriction enzyme that uses a six (6 ) base recognition sequence will cut DNA, on average, every ________ bases, if all four nucleotides are present in equal proportions
A) 4096 B) 256 C) 5000 D) 500 E) 1296
What happens when a culture is incubated above the organism's maximum temperature for growth?
a. The cell continues to grow at the normal rate. b. The cells grow much faster than normal because the enzymatic reactions are occurring at a much faster rate. c. The cell membranes collapse, proteins denature, and the cell usually dies. d. The transport of nutrients into the cell is slow; therefore, the cells grow more slowly than normal.