What structure is an important clinical landmark because it can be used for counting the ribs?
A. Pubic tubercle
B. Xiphoid process
C. Sternal angle
D. Sternal notch
E. Acromion
Answer: C
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What effect did decreasing the extracellular sodium have on the resting membrane potential?
A) Only a small change occurred, because the resting neuron is not very permeable to sodium. B) Only a small change occurred, because the sodium channels were mostly open. C) The resting membrane potential disappeared. D) The resting membrane potential became less negative.
A gene's position on a chromosome is called a
A) karyotype. B) map. C) recombinant. D) genome. E) locus.
The sense of taste projects to the gustatory cortex located in the
A) insula. B) temporal lobe. C) frontal lobe. D) prefrontal cortex. E) occipital lobe.
Which of the following is not true regarding sickle-cell disease?
A. It is a cause of anemia. B. It is advantageous in that it can protect carriers against malaria. C. It is caused by a recessive allele that modifies the structure of hemoglobin. D. It is a cause of malaria. E. It is due to a hereditary hemoglobin defect.