During the growing season, when there is often 24 hours of daylight, plants and lichen cover the ground in which of the biomes?
a. boreal forest
b. chaparral
c. arctic tundra
d. temperate grasslands
c. arctic tundra
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In the United States, how many embryos,
created by IVF, remain frozen?
a. 10,000 b. 50,000 c. 100,000 d. 500,000 e. 1,000,000
Muscles constitute 60-70% of our body mass
Indicate whether the statement is true or false
Water is most dense and thus heaviest at 4°C. At 0°C, ice forms and can float on liquid water. Suppose ice were most dense at 0°C. What would happen in a lake at this temperature?
A. Ice would not form because solids are always less dense than liquids. B. The ice would cover the bottom of the aquatic system and would build up in layers over time. C. The cold temperatures and the subsequent ice formation would prevent hydrogen bonds from forming between the water molecules, thus causing the existing ice crystals to become disassociated from each other. D. The ice would cover the surface of the aquatic system and would never melt.
Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele. Which of the following statements is true about this disease?
a) Heterozygous individuals are more fit than homozygous dominant individuals, so eventually, there will only be heterozygotes in the population. b) Heterozygous individuals may pass on their copy of the disease-causing allele to offspring. c) All cases of this disease must be caused by new mutations. d) Heterozygous individuals only pass on the dominant copy of the allele to offspring. e) A homozygous individual can pass on both of the recessive genes for Tay-Sachs.