RNA differs from DNA in many ways, including
A. DNA contains deoxyribose and RNA contains ribose.
B. DNA contains thymine and RNA contains uracil instead of thymine.
C. All are correct.
D. DNA is double stranded and RNA is single stranded.
E. RNA can catalyze some chemical reactions and DNA cannot.
C. All are correct.
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Which of the following statements is true regarding the carbon cycle?
A. It cycles both carbon and H2O. B. It evolved before plants appeared on Earth. C. It was based on microbes during the early stages of Earth's history. D. It involves both long- and short-term processes. E. All of these statements regarding the carbon cycle are true.
List the primary germ layers formed by gastrulation. What tissues will they form in the adult?
Endoderm: Mesoderm: Ectoderm:
Which group of colonial protists has the greatest relatedness to animals?
a. Ascomycetes b. Green algae c. Zygomycetes d. Choanoflagellates e. Amoebas
Ribosomes can catalyze formation of peptide bonds. This supports the hypothesis that _____
a. an RNA world preceded DNA-based genomes b. RNA can hold more information than DNA c. the first protists had RNA as their genetic material d. all of these