The hypothesis that suggests that clay may have served as the site of polymerization of both nucleic acids and proteins that might have joined to form the first protocells was proposed by
A. Stanley Miller.
B. Graham Cairns-Smith.
C. Thomas Cech.
D. Aleksander Oparin.
E. Sidney Fox.
Ans: B. Graham Cairns-Smith.
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Proteins are diverse molecules that perform a wide variety of functions. Which of the following is not a typical function of proteins?
A. Transport B. Movement C. Catalyze reactions via enzymes D. Energy storage
A scientist measured heritability in yield per acre of a strain of wheat grown on a farm in Eastern Europe and determined that it was 80%. She can therefore conclude that:
A. 80% of variation among individuals when the same strain of wheat is grown in Nebraska will be due to genetic differences. B. 80% of variation among individuals when the same strain of wheat is grown on the same farm the following year will be due to genetic differences. C. when the same strain of wheat is grown on two different farms at the same time, 80% of the average difference in yield per acre will be due to genetic differences among populations. D. All of these choices are correct. E. None of these choices is correct.
The brown tree snake in Guam had a of about 100 snakes per hectare, which is approximately equal to two American football fields.
A. population B. death rate C. population density D. growth rate E. population distribution
The leading cause of extinction by human activities worldwide is
A) habitat fragmentation. B) predation. C) pollution. D) invasive species. E) overexploitation.