What feature do the carbon and nitrogen cycles have in common?
A. A large atmospheric component
B. Many microbes involved in cycling
C. Mostly local cycling
D. Often a limiting nutrient
E. Involvement in global climate change
Answer: A
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14Cis a radioactive isotope, and it turns into ____________________ when it decays
Fill in the blank(s) with the appropriate word(s).
The length of a DNA sequence is _____ than the mature mRNA transcribed from it, because
shorter; it does not contain exons. equal; it was transcribed from the DNA sequence. longer; it does not contain introns. shorter; each codon of three bases encodes only one amino acid. longer; each codon of one amino acid encodes three bases.
The cytoskeletal structure(s) that are composed of actin and regulate cell shape, cell movement, and muscle contraction include
A. microtubules. B. microfilaments and microtubules. C. intermediate filaments. D. microtubules and intermediate filaments. E. microfilaments.
Which of the following animals is a genetic male?
A. honeybee diploid B. grasshopper XO C. Drosophila XXY D. bird ZW