The relationship between strands of RNA and DNA
is
a. antagonistic.
b. opposite.
c. complementary.
d. an exact duplicate.
e. unrelated.
Answer: c
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How are the sulfur cycle and the phosphate cycle interconnected?
A. Phosphate is released from rock and soil by sulfuric acid. B. Sulfate and phosphate react together to produce amino acids for protein production. C. Sulfite is the nutrient used by phosphate reducers. D. Phosphate is the nutrient source used by sulfur oxidizers.
Mitochondria and chloroplasts are the other organelles besides the nucleus that contain:
A. pigments. B. pores. C. plasma membranes. D. channels. E. DNA.
Approximately how many rainforest species become extinct every minute?
a. one b. two c. five d. ten e. twenty
According to the _____, modern humans originated in, and migrated out of, East Africa
a. haplotype data of mitochondrial DNA sequences b. haplotype data of Y chromosome sequences c. out-of-Africa model d. multiregional model e. fossil record