Select the correct order of blood flow through the heart.
a. Pulmonary vein - Right atria - left atria - left ventricle - right ventricle - aorta
b. Vena cava - left atria - left ventricle - pulmonary vein - pulmonary artery - right atria - right ventricle -aorta
c. Vena cava - right atria - right ventricle - pulmonary artery - pulmonary vein - left atria - left ventricle - aorta
d. Pulmonary vein - right atria - left atria - aorta - vena cava - left atria - left ventricle - pulmonary artery
Answer: c. Vena cava - right atria - right ventricle - pulmonary artery - pulmonary vein - left atria - left ventricle - aorta
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What can Antarctic ice core samples tell us about atmospheric CO2 levels? Select all that apply
A. Nothingâ€"ice is made of H2O and not CO2. B. CO2 ice core data confirms CO2 measurements taken directly from the atmosphere. C. Ice cores can help scientists estimate atmospheric CO2 levels from centuries ago. D. Ice cores can tell scientists exactly what plants lived on Earth centuries ago.
Opsonizing antibodies are those that function by:
a. attaching to the surface of pathogens and contributing to their destruction by the lytic action of complement. b. binding to and blocking surface receptors for host cells. c. attaching to the surface of pathogens and making the pathogens more amenable to ingestion by phagocytic cells. d. attaching to the surface of pathogens and contributing to their destruction by che-motaxis.
A researcher is studying eukaryotic cells that shows an abnormal pattern of surface glycosylation. The researcher determines that these cells have normal levels of glycolipids and integral membrane proteins with O-linked glycosylation. The researcher discovers that there are no N-linked glycosylated proteins on the cell surface and unusually high levels of glycosylated in the ER membrane. What is a reasonable hypothesis to explain this observation?
A. The cell is defective in synthesizing of carbohydrates B. The cell is defective in assembling carbohydrate trees C. The cell has a defective oligosaccharide transferase D. The cell has a defect in its protein sorting pathway E. The cell has a defect in its ER localization signal
There is a direct correlation between the cell cycle checkpoints and concentrations of which types of proteins?
a. kinases b. p53 c. cyclins d. retinoblastoma proteins (Rb)