Two mechanical barriers to infection are interferon and inflammation.
Answer the following statement true (T) or false (F)
False
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During DNA replication,
A. the DNA double helix comes apart, and new nucleotides are brought in, forming two double helices. B. two single strands of DNA come together, restoring complementary base pairing. C. tRNAs bring specific amino acids to an mRNA molecule. D. amino acids are joined.
Which of the following statements about the action potential is false?
A) The rapid depolarization phase is caused by the entry of potassium ions. B) During the repolarization phase, sodium channels close and potassium channels open. C) During the depolarization phase, membrane potential becomes positive. D) During the hyperpolarization phase, the ion pumps re-establish the sodium and potassium concentrations across the cell membrane. E) Repolarization occurs as potassium ions leave the axon.
The human brain is the consistency of tofu and typically weighs about eleven pounds
a. True b. False Indicate whether the statement is true or false
The condition acute respiratory distress syndrome (ARDS) is characterized by damage to the respiratory membrane that causes it to thicken. What effect will this thickening have on the pulmonary gas exchange?
a) It would increase external gas exchange because thickness would increase surface area-to-volume ratio. b) There will be a decrease in internal gas exchange. c) The thickness of the respiratory membrane will decrease the rate at which external gas exchange can occur. d) There would be a decrease in oxygen gas exchange and increase in carbon dioxide gas exchange.