Which of the following does NOT occur during mitosis?
A) condensation of the chromosomes
B) replication of the DNA
C) spindle formation
D) separation of the spindle poles
B
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Which of the following is the fourth basic step to genetically modify a cell?
A) transformation B) ligation C) plasmid cleavage D) isolation of gene E) restriction-enzyme digestion of gene
Which factor initiates the intrinsic clotting mechanism?
a. factor X b. factor XI c. factor ACI d. thrombin e. prothrombin activator
During intense physical exercise, human cells and tissues increase their need for oxygen to provide the ATP necessary for work. Why does heart rate have to increase to meet the need for oxygen?
What will be an ideal response?
Why does vomiting often cause a reduction in breathing rate?
a. Reduced breathing occurs to allow PCO2 to rise to aid in the increase in blood bicarbonate. b. Reduced breathing causes an increase in PCO2 which lowers pH toward the setpoint after vomiting causes a loss in acid and rise in blood pH. c. Reduced breathing causes a fall in PCO2 which lowers the pH, moving blood pH toward its homeostatic setpoint. d. Reduced breathing causes a fall in blood PCO2, raising the pH, moving blood pH toward its homeostatic setpoint.