Low levels of estrogen inhibit the hypothalamus and anterior pituitary, whereas high levels of estrogen stimulate the hypothalamus and anterior pituitary
Indicate whether the statement is true or false
T
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At the blastocyst stage, the cells are considered
A. endodermal. B. totipotent. C. extraembryonic. D. pluripotent.
All of the following are guidelines for using the oil-immersion lens EXCEPT which statement?
A) Once your slide is in position, place a drop of oil on the slide and focus first at low power. B) Place the slide on the microscope and focus first on low power and then medium and the high dry magnifications. C) Once the oil-immersion lens is in place, swing the objective away from the slide and add a small drop of oil. D) Once the oil is applied and the oil-immersion objective lens is moved in place, focus the lens with the fine adjustment knob.
What ion triggers synaptic vesicles to release neurotransmitters into the synaptic cleft?
A) calcium B) magnesium C) chlorine D) sodium
Which is true about the composition of organic molecules?
A. They always contain oxygen. B. They always contain carbon. C. They are always macromolecules. D. They never contain hydrogen. E. They never contain oxygen.