Which structure is part of the brain stem?
A. thyroid
B. hypothalamus
C. adrenal cortex
D. Medulla Oblongata
Answer: D. Medulla Oblongata
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Which of the following are characteristics of cyclins?
a. They are active only when combined with another cyclin molecule. b. The levels of cyclins remain constant throughout the cell cycle. c. The levels of cyclins fluctuate throughout the cell cycle. d. Cyclins add phosphate groups to target proteins. e. Cyclins remove phosphate groups from target proteins.
A description of sharks that does not apply to other fish groups is that
A. they are bony, with ray-finned appendages. B. they are cartilaginous craniates without jaws. C. they are bony with lobe-finned appendages. D. they have scaleless skin with lateral lines for sensing vibrations. E. they are cartilaginous craniates with jaws.
Phospholipase C catalyzes the reaction in which:a
IP3 is converted to DAG. b. PIP2 is split. c. a protein kinase is activated. d. calcium ions are released from the ER. e. DAG is converted to PIP2.
Which of the following tends to be more complex in a parasitic helminth than in free-living helminths?
A) digestive system B) nervous system C) reproductive system D) digestive and nervous systems E) digestive, reproductive, and nervous systems