What nucleoside trisphosphate, other than ATP, provides some of the energy for protein synthesis?
A. CTP
B. GTP
C. TTP
D. UTP
Answer: B
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According to bottom-up and top-down control models of community organization, which of the following expressions would imply that an increase in the size of a carnivore (C) population would negatively impact its prey (P) population, but not vice versa?
A) P ? C B) P ? C C) C ? P D) P ? C ? P E) C ? P ?
Nuclear pores have proteins that open and close, controlling flow of cell solutions and molecules in and out of the nuclear envelope (a double-thick membrane). In this, nuclear pores are similar in structure and function to
A. gap junctions. B. cilia. C. cytoskeleton microtubules. D. anchoring junctions. E. vacuoles.
Letter ____ can indicate a fruit or developing root cells
a. A b. B c. C d. D e. E
What is a key characteristic of enzyme behavior?
A. Enzyme shape is stable during catalysis. B. The active site of an enzyme orients its substrate molecules, thereby promoting interaction of their reactive parts. C. All enzymes have an active site where coenzymes are temporarily bound. D. Each enzyme can catalyze multiple types of reactions. E. Enzyme activity is not affected by pH and temperature.