All of the following statements about neurotransmitters are generally true EXCEPT:
(A) They may cause depolarization or hyperpolarization of the postsynaptic
membrane.
(B) They are actively transported across the synaptic cleft.
(C) They are released from membrane-bound packets called vesicles.
(D) They may be enzymatically degraded at the postsynaptic membrane.
(E) They bind to specific receptors on the postsynaptic membrane.
Ans: (B) They are actively transported across the synaptic cleft.
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How was the navigation ability of young loggerhead sea turtles studied by Kenneth Lohmann?
a. He placed radio transmitters on the shells of numerous hatchlings and tracked their migration patterns in the Atlantic ocean. b. He genetically engineered turtles so they lacked magnetoreceptors and then studied their behavior compared to a control group. c. He subjected turtles to an electromagnetic field opposite that of Earth's magnetic field, and then tracked the direction the hatchlings swam. d. The loggerhead turtles were injected with magnetite to see what impact it had on their navigation. e. Small magnets were glued to the hatchlings' shells, and their behaviors were monitored.
Hydrochloric acid in the stomach aids in
a. digestion of fats. b. digestion of proteins. c. digestion of carbohydrates. d. production of leptin. e. destruction of microbes in food and digestion of proteins.
Describe one technique that can be used to generate multiple copies of a gene that is of interest to a researcher
What will be an ideal response?
The base sequence of DNA determines the base sequence in the molecule called ____________ , which carries the genetic information from the nucleus to the cytoplasm.
What will be an ideal response?