Hormonal actions on cells affect all of the following except
A) quantities of enzymes.
B) activities of enzymes.
C) synthesis of enzymes.
D) gating of ion channels.
E) thickness of the plasma membrane.
E
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Answer the following statements true (T) or false (F)
1. Ion pumps are specialized protein structures in the cell membrane. 2. Ion pumps increase the efficiency of transport of material across the cell membrane because each pump can transport a number of different substances. 3. In the DNA molecule, the fact that adenine always pairs with thymine is an example of complementary base pairing. 4. Transcription occurs at the ribosome. 5. Translation occurs at the ribosome.
The bone that makes up the lower jaw is the
A) mandible. B) maxillary. C) zygomatic. D) temporal. E) cribriform plate.
The outermost portion of the tooth is called
A) root. B) pulp. C) dentine. D) enamel. E) cementrum
In an adult, the conus medullaris is found at about
A) T6. B) T10. C) L1. D) L5. E) Co1.