To maintain guard cell turgor, which of the following must occur?
A. Potassium ions are pumped out.
B. Energy is constantly expended.
C. Water exits by osmosis.
D. Stomata take up oxygen.
E. Transpiration occurs.
Ans: B. Energy is constantly expended.
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The heartbeat originates in the:
A. sinoatrial node located at the junction of the vena cava and the right atrium. B. sinoatrial node located at the junction of the vena cava and the left atrium. C. atrioventricular node located in the wall of the atrioventricular valve. D. atrioventricular node located in the tissue separating the atria and ventricles. E. sinoatrial node and atrioventricular node simultaneously.
Heterozygotes for the Tay-Sachs disease allele appear to have greater than normal resistance to _____________________, which supports the theory that _____________________ explains why this harmful allele persists in the gene pool
Fill in the blank(s) with correct word
Explain why individuals with type O blood can donate to any other blood type, and why individuals with type AB
blood can accept blood of any blood type. What will be an ideal response?
When environmentalist Rachel Carson warned of a "silent spring," she was referring specifically to:
A) the senseless slaughter of migratory birds by hunters. B) the threat posed to birds by widespread application of pesticides. C) the threat posed to insects by widespread application of pesticides. D) the threat posed to amphibians by newly emerging diseases. E) catastrophic drought caused by global climate change.