Which term best describes the concentration gradients for sodium and potassium on an excitable cell?
a. Non-existent
b. Steep
c. Flat
d. Shallow
Ans: b. Steep
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Which sequence indicates the correct pathway for blood in the arterial flow of the upper appendage?
A. Axillary artery - brachial artery - subclavian artery - ulnar artery B. Brachial artery - subclavian artery - axillary artery - radial artery C. Axillary artery - subclavian artery - radial artery - ulnar artery D. Subclavian artery - brachial artery - axillary artery - radial artery E. Subclavian artery - axillary artery - brachial artery - ulnar artery
What is the correct order of the branches off the aortic arch from right to left?
A. Brachiocephalic trunk, right common carotid artery, left subclavian artery B. Right subclavian artery, brachiocephalic trunk, left common carotid artery C. Brachiocephalic trunk, right common carotid artery, left common carotid artery D. Brachiocephalic trunk, left subclavian artery, left common carotid artery E. Brachiocephalic trunk, left common carotid artery, left subclavian artery
Where does the acetylcholine released for muscle contraction bind?
A) receptors in the axon terminal B) receptors in the motor end plate C) receptors in the sarcoplasmic reticulum D) receptors in troponin
How accurate is DNA replication?
a) there are frequent errors made during DNA replication, but this does not matter because of the immense size of the DNA molecule b) the few errors made by DNA polymerase are usually corrected by DNA polymerase or other repair enzymes c) DNA polymerase always makes a perfect copy of the original DNA d) DNA polymerase makes very few errors, so no repair enzymes are needed