RNA differs from DNA in
A. its single-stranded nature.
B. the type of sugar found in the nucleotide.
C. the types of pyrimidine bases.
D. the type of sugar found in the nucleotide, the types of pyrimidine bases, and its singlestranded
nature.
E. the types of pyrimidine bases and its single-stranded nature only.
D
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An invasive species:
A. is any non-native species that has been introduced to an ecosystem. B. is always the competitively dominant species in an ecosystem. C. is any species that has been genetically modified by man. D. is any species that causes disease and death in host organisms. E. is any species that has a negative impact on community diversity.
A pine tree is called a sporophyte because it
a. develops from a germinated spore. b. produces spores by meiosis. c. is haploid. d. undergoes fertilization. e. reproduces by both sexual and asexual means.
Some scientists predict that as atmospheric carbon dioxide levels increase, plant growth will also increase. What is the best explanation for this hypothesis?
A. Plants consume carbon dioxide from the atmosphere during photosynthesis. B. Plants release carbon dioxide into the atmosphere during photosynthesis. C. Plants consume carbon dioxide from the atmosphere during respiration. D. Plants release carbon dioxide into the atmosphere during respiration.
Saturated fats are saturated with ________
A) carbon B) nitrogen C) hydrogen D) oxygen