The exchange of oxygen and carbon dioxide occurs in the human lungs in the ____.
A. bronchi
B. alveoli
C. bronchioles
D. trachea
E. glottis
Answer: B
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Which of the following statement about the plasma membrane Na+/K+-ATPase pump is INCORRECT?
A. It is used to generate sodium and potassium gradients across the membrane. B. It is an electrogenic pump. C. It is a pump for active transport of K+ out of the cell and Na+ into the cell. D. It is a pump for active transport of K+ into the cell and Na+ out of the cell. E. It is a pump that utilizes energy from ATP.
A tRNA with the anticodon sequence 5? IUA 3? will not normally exist because
A) 5? UAA 3? is a stop codon. B) I is not a base present in tRNAs. C) it will recognize codons for different amino acids. D) 5? UAU 3? and 5? UAC 3? both specify tyrosine.
During a relative refractory period, ____
a. an axon can transmit impulses comparable to a resting neuron. b. an axon cannot transmit an action potential. c. an axon can transmit impulses, but the threshold level is higher. d. an axon can transmit impulses, but the threshold level is lower. e. all voltage-activated sodium channels are inactivated.
Which prokaryotic group is most closely related to eukaryotes
What will be an ideal response?