During what time of the day would the most hydrogen bonds reform between water molecules in a lake?
A) in the late morning
B) at noon
C) in the late afternoon
D) at night
D
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Which of the following scientists demonstrated
for the first time that molecules of life could have come from nonliving entities (gases, water, and spark discharge)?
a. Crick and Orgel b. Wallace c. Miller and Urey d. Chargaff e. Cuvier and Lyell
The use of SNPs for analyzing genomes is based on ____
a. the nucleotide base pairing in the SNPs b. the types of nucleotides in the SNPs c. differences in SNPs among individuals d. the ratio of purines to pyrimidines in SNPs e. bonding patterns between nucleotides in the SNPs
Which of the following represents the correct organization of ecological systems from the lowest to the highest level of organization?
A) individual, biome, biosphere, community, population, ecosystem B) individual, community, population, ecosystem, biosphere, biome C) individual, population, community, ecosystem, biome, biosphere D) individual, population, community, biome, biosphere, ecosystem
An individual receives a flu vaccine and is well protected for the current flu season. The following flu season, the individual fails to get another flu vaccine and comes down with the flu
What is the most likely explanation for vaccine ineffectiveness in the subsequent flu season? A) Antibiotic-resistant bacteria were able to overcome the effects of the vaccine. B) The immune system becomes weaker when continually exposed to the same virus contained in the vaccine. C) The flu virus mutated, leading to a new strain of virus that could escape detection by the immune system. D) Most vaccines have a limited lifetime and eventually break down and become ineffective.