What component determines the primary structure of a protein?
a. the number of hydrogen atoms
b. the lipid profile
c. the amino acid sequence
d. the enzymes
c. the amino acid sequence
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The oldest known megafossils of early vascular plants may be characterized as:
a. possessing dichotomously branched stems with leaves. b. possessing dichotomously branched stems without leaves or roots. c. possessing erect stems with megaphylls. d. possessing roots but lacking sporangia. e. lacking roots but possessing megaphylls.
What effect would a decrease in the amount of greenhouse gases in Earth's atmosphere have?
A) cooler average global temperatures B) warmer average global temperatures C) no change in average global temperatures D) cooler temperatures in the northern hemisphere and warmer temperatures in the southern hemisphere
Support for the succession mechanism of tolerance is found in research on plant communities that shows
A. that plants release toxins that prevent other species from establishing. B. competition-tolerant species colonize first. C. climax communities rarely form. D. succession is determined largely by species that exist in the ground as seeds or old roots. E. succession is random and cannot be predicted by existing species.
Any agent that causes damage to DNA is a potential ________
A) oncogene B) proto-oncogene C) pollutant D) carcinogen