During the Snowball Earth temperatures at the equator rarely exceeded -20 degrees Celsius. Why didn't heat from the sun melt the ice?
A. The ozone layer absorbed all the heat.
B. Ice reflected most of radiant energy.
C. The earth's core was cooled and kept the ice frozen.
D. The high levels of atmospheric moisture created extensive cloud cover.
Answer: B
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Hemorrhagic and nonhemorrhagic fever diseases have a common feature of a high fever. These categories of diseases are distinguished by
A. the pattern of the fever, whether it is constant or varies with time. B. the viral load in the blood, specifically the viral titer. C. viral causes in hemorrhagic fevers and bacterial or protozoan causes in nonhemorrhagic fevers. D. the overall mortality rate, as hemorrhagic fevers have a much higher mortality rate. E. the integrity of the capillary endothelium and its ability to contain the blood.
Sex chromosomes are ____
a. completely different between the two sexes b. partially homologous but also have unique regions c. found only in males d. unable to line up properly at the metaphase plate e. completely homologous but always have different alleles
Four of the following statements are ways in which pathogenic fungi can kill plant tissue. Which one is the exception?
A. Decreasing water absorption B. Depriving plants of sugars it needs C. Breaking down rocks by releasing acids D. Reducing nutrients for seed production E. Secreting toxins
What is meant by a gene knockout?
What will be an ideal response?