Cellular items that can NOT be transported through proton channels are:
A. proteins
B. nucleotides
C. mitochondria
D. water
E. sugars
C. mitochondria
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Which of the following statements about marine bony fish is false?
A. Chloride cells in the gills actively pump chloride ions into the body. B. They maintain a body fluid solute concentration that is lower than that of the surrounding seawater. C. They drink water to replenish water supplies. D. They are osmoregulators. E. They tend to lose water through osmosis.
The electrical stimulus for each human heartbeat begins in the
A. right atrium at the sinoatrial node. B. left atrium at the sinoatrial node. C. right atrium at the atrioventricular node. D. right ventricle at the atrioventricular node. E. pulmonary trunk at the sinoatrial node.
Which of the following is false about a cell undergoing mitosis with 4 chromosomes?
A. During metaphase there are 4 chromosomes B. During prophase the homologous chromosomes line up and cross-over C. During metaphase there are 4 centromeres D. During anaphase there are 8 DNA molecules
The usefulness of agar in solidifying microbiological growth media is limited because it does not remain solid at temperatures above 28oC.
Answer the following statement true (T) or false (F)