In humans, what percent of the genome is devoted to the exons that encode proteins?
A. about 50%
B. about 35%
C. about 75%
D. about 20%
E. about 1.5%
Answer: E
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Viruses are in the group
A. viridaeae. B. eukarya. C. archaea. D. bacteria. E. None of the choices is correct.
A weed in your garden is flowering. When you look very closely, you notice that what you thought was a single flower is actually a very tightly clustered group of tiny yellow tubular flowers. Upon further inspection, you find that each one of these tiny tubular flowers has petals, sepals, stamens, and a single carpel. What is true about this plant?
_____ It has inflorescences. _____ It has perfect flowers. _____ It has imperfect flowers. _____ It has complete flowers. _____ It has incomplete flowers.
Explain negative feedback control using thyroid hormones as an example
What will be an ideal response?
The increasing concentration of fat-soluble toxins at successive trophic levels is known as ________.
a. trophic cascade b. biomagnification c. energy flow d. gross primary productivity