What base is found in DNA but not in RNA?

A. thymine

B. adenine

C. guanine

D. deoxyribose

Bruce Ames constructed a mutagenicity test which initially missed carcinogens which were noncarcinogenic to the tester strains. Why? a. tester strains were more resistant to the mutagenic effects of the carcinogen than eukaryotes b.

What is the relationship of photosynthesis to chloroplast?

Soil from flat, poorly drained areas on clay substrate is likely to be have what sort of coloration?

How do streams conserve biodiversity? a. they connect habitats b. they are confined by a bank and a bed c. they inhibit fish migration d. all of the above

Which of the following is not an accurate description of chemical reactions? A. The rates of chemical reactions can vary. B. During chemical reactions, energy can be released or used up. C.

Is the meaning of life the same for animals and humans?

Which of the following best describes a process of erosion? A. Rocks along the coast are broken up by waves crashing into the shore. B. The wind lays down sediment to form small hills called dunes. C.

What is sustainability? the number of organisms in an area being able to continue for a long time the variety of organisms in an area being able to grow larger over time

The allele for cystic fibrosis is recessive. What does this mean?

Which of the following statements is true? The Milky Way Galaxy is the only galaxy in the universe. The earth is always the same distance away from the sun. Bode's law correctly predicted the location of Neptune.