What features of the respiratory system protect it from infection?
A. Nasal hairs
B. Macrophages
C. Mucus
D. Cilia
E. All of the choices are correct.
Answer: E
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Leader sequences contain signals that:a
prevent enzymes from degrading the newly synthesized mRNA. b. inhibit ribosome binding until the appropriate time. c. initiate chain termination. d. allow the ribosomes to be properly positioned to translate the message. e. allow tRNA molecules to successfully bind to mRNA.
RNA polymerase moves in which direction along the DNA?
A. 5' to 3' along the double-stranded DNA B. 3' to 5' along the nontemplate strand C. 5' to 3' along the template strand D. 5' to 3' along whichever strand it's on E. 3' to 5' along the template strand
Which is the only trimester to include both the embryo and fetal stages?
What will be an ideal response?
A defining characteristic of allopatric speciation is
A) the appearance of new species in the midst of old ones. B) asexually reproducing populations. C) geographic isolation. D) artificial selection. E) large populations.