Which model did scientists develop to describe the cell membrane?
A.) phospholipid model
B.) dynamic model
C.) fluid mosaic model
D.) transport model
Ans: C.) fluid mosaic model
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Which one of the following types of post-transcriptional modification is common in eukaryotes?
A. polyadenylation B. intron removal C. 5' cap addition D. polyadenylation and intron removal E. All of these choices are correct.
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?
Forests and other natural ecosystems, such as wetlands, exhibit the "sponge effect," meaning that they
A) soak up water from runoff and rainfall, and thus accumulate pollutants B) soak up pollutants from runoff and rainfall, releasing it quickly into streams and rivers and raising their levels C) soak up water from runoff and rainfall, saturating nearby ecosystems D) soak up water from runoff and rainfall, releasing it at a regular rate that moderates flooding of streams and rivers E) draw water away from rivers and streams, lowering their levels
Which of the following mechanisms normally repairs pyrimidine dimers?
A) base-excision repair B) light repair C) single-strand repair D) error-prone repair E) SOS response repair