Which stage of microtubule assembly is the stage in which nucleation occurs?
A) sheets of protofilaments
B) closing of microtubules
C) oligomers
D) dimers
E) elongation
C) oligomers
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Covalent modification
A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) all of the above
Because small quantities of powerful explosives can be hidden easily, a sensor that could detect trace amounts of illicit chemicals would be a useful tool. What animal sensory modality is exquisitely sensitive to minute quantities of airborne chemicals?
Honeybees have an incredible ability to distinguish thousands of different odorant molecules, using their large repertoire of olfactory receptors. A wide variety of different types of chemicals can be detected as odorants -- they simply require olfactory neurons with a receptor that can bind the chemical and transduce that stimulus into a receptor potential. A. olfaction B. taste C. vision D. hearing E. touch
Most euryarchaea, except the class Archaeoglobi and the order Archaeoglobales, reduce sulfur during anaerobic respiration by using sulfate as a terminal electron acceptor.
Answer the following statement true (T) or false (F)
Which reaction represents a dehydration synthesis?
A. C6H12O6 + C6H12O6 + C6H12O6 ® C18H32O16 + 2H2O B. CO2 + H2O ® C6H12O6 + O2 C. NaOH + H2O ® Na+OH- + H2O D. triglyceride ® glycerol + 3 fatty acids + 3H2O