Which statement is not a characteristic of biofilms?
A. They can accumulate on living and nonliving surfaces.
B. They involve bacteria only.
C. They are very difficult to eliminate with antimicrobials.
D. They can be involved with human disease.
E. They evolve and adapt to their surroundings.
Answer: B
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To attach a particular amino acid to the tRNA molecule that will transport it, an enzyme, an aminoacyl-tRNA synthetase, is required, along with ATP. Initially, the enzyme has an active site for ATP and another for the amino acid
, but it is not able to attach the tRNA. What must occur for the final attachment to occur? A) The ATP must first have to attach to the tRNA. B) The binding of the first two molecules must cause a 3-D change that opens another active site on the enzyme. C) The ATP must be hydrolyzed to allow the amino acid to bind to the synthetase. D) The tRNA molecule must alter its shape to be able to fit into the active site with the other two molecules. E) The end of the tRNA must be cleaved before it can have an attached amino acid.
Temperature extremes, lack of water, and other environmental stresses trigger an increase in which hormone?
a. gibberellin b. auxin c. abscisic acid d. ethylene e. cytokinin
Water ecosystems become eutrophic when there is ________.
A. nutrient enrichment of waters B. acidification of waters C. nutrient removal from waters D. deoxygenation of waters
A person you know has been in an automobile accident. The accident caused a dramatic personality change. Before the accident, he was industrious and well liked; after the accident, he is profane, impetuous, and incapable of working toward a goal
Which portion of the brain was most likely damaged? A) Hypothalamus B) Hippocampus C) Temporal lobe D) Frontal lobe E) Parietal lobe