Chlorine compounds remain stable and effective in the presence of excess organic matter.
Answer the following statement true (T) or false (F)
False
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In vertebrates, DNA methylation - the addition of a methyl group to DNA nucleotides - ensures that
A. the gene functions without interruption. B. no errors will be made during transcription. C. the nucleosome will quickly form, which assists in mRNA formation. D. once that gene is transcribed, the mRNA is saved and used over and over again. E. once a gene is turned off, it will remain off.
Which of the following statements is true regarding respiration in birds? Choose all that
A. Bird lungs inflate due to negative pressure in the chest cavity. B. Bird lungs deflate due to negative pressure in the chest cavity. C. Oxygen enters the bloodstream via crosscurrent exchange. D. Oxygen enters the bloodstream via countercurrent exchange. E. Respiration depends on the movement of air through air sacs. F. Respiration depends on the movement of air through spiracles.
Oxygen has an atomic number of 8. This
means that oxygen has 8
a. electrons in its outer most shell. b. neutrons in its nucleus. c. protons and 8 neutrons in its nucleus. d. protons in its nucleus. e. neutrons in its outer shell.
Megaspores
a. are haploid. b. produce the embryo sac. c. produce gametophytes. d. are female. e. fit all of these descriptions.