Nucleic acids and proteins both contain which element as one of
their main elements?
А
Nitrogen
B
Iron

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine

Which of the following statements best distinguishes a hypothesis from a theory? a. theories are hypotheses that have been proved. b.hypotheses are guesses; theories are correct answers c. hypotheses usually are relatively narrow in scope; theories have broad explanatory power. d. theories are proved to be true; hypotheses are often contradicted by experimental results.

Which star has the highest apparent magnitude?