During DNA replication, complementary nucleotides are added to the separated strands of the original DNA by enzymes. Which one of the following bases would a nucleotide contain if it were paired to a nucleotide containing thymine?
A) adenine
B) uracil
C) another thymine
D) cytosine
E) guanine
A
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The amount of energy required to raise the temperature of 1 kilogram of water by 1° Celsius is a
A. joule. B. None of the answer choices is correct. C. kilocalorie. D. calorie. E. measure of density.
Based on the position of the continents in Earth’s history, you would expect the organisms of Australia to be more closely related to those of:
1.Europe
2.Asia
3.North America
4.South America
In an area with nitrogen-poor soil, legumes often dominate over other plants because they
A) have long taproots that can extract nitrogen from deeper down in the soil. B) inhibit the growth of denitrifying bacteria around their roots, thus keeping more nitrate in the soil. C) have unique access to the large atmospheric pool of nitrogen thanks to their symbiotic bacteria. D) obtain supplemental nitrogen by trapping insects and other prey. E) do not need nitrogen at all.
Which of the following are important in breaking down organic material in fertile topsoil?
A) rock particles B) humus and cations C) bacteria and fungi D) plant roots