Researchers suggest that despite the trend observed, the depletion of oxygen from the atmosphere due to burning of fossil fuels is currently not a serious environmental concern
because the change in oxygen levels is small compared to the abundance of atmospheric
oxygen, which is sufficient for survival of animals and humans.
True or false. Severe declines in ocean plants (phytoplankton) due to ocean warming and
acidification from dissolved CO2 (forming HCO3
- and CO3
2-) could potentially lead to larger
decreases in O2 levels over time, thereby altering this conclusion.
What will be an ideal response?
True
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What special adaptation(s) has/have Thermoplasma evolved to survive in hot acidic environments?
A) Thermoplasma stabilize their cytoplasmic membrane by incorporation of tetraether lipoglycans in the cytoplasmic membrane. B) Thermoplasma have a reinforced cell wall containing basic amino linkers in the peptidoglycan. C) Thermoplasma excrete hydrogen ions and import hydroxyl ions. D) Thermoplasma are highly motile to avoid destruction.
Which of the following is the most common cause of tooth decay?
A) Staphylococcus aureus B) Streptococcus agalactiae C) Streptococcus mutans D) Streptococcus pyogenes
Which of the following indicators of global warming
has (have) occurred? a. increase in the temperature of the lower atmosphere b. rise in sea level c. global surface temperatures are increasing at a faster rate d. melting of glaciers e. all of these
Which one of the following happens during repolarization of a neuron?
A) Sodium channels close, and potassium rushes out of the cell to temporarily reestablish the membrane potential. B) Potassium channels close, preventing further loss of positive ions. C) The sodium-potassium pump is turned off. D) Sodium channels open to allow sodium ions to rush back out of the cell. E) The membrane potential is eliminated.