The unexpressed regions of split genes are called ________.
A. codons
B. introns
C. exons
D. endons
Answer: B
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How many genes are generally found for every million bases of prokaryotic DNA?
A. 10 B. 100 C. 1,000 D. 10,000 E. 100,000
Earth's largest carbon reservoir is ____
a. the atmosphere c. seawater b. sediments and rocks d. living organisms
Why is a variegated plant considered heteroplasmic?
A) The plant has mutant and wild-type chloroplast DNAs distributed amongst the cells in different ratios. B) The plant has only two types of cells, one with only mutant chloroplast DNAs and one with only wild-type chloroplast DNAs. C) All of the plant's cells have mutant and wild-type chloroplast DNAs. D) All of the plant's cells have mitochondria and chloroplasts.
Which of the following is a FALSE statement concerning amino groups? Amino groups _____
A) are basic with respect to pH B) are found in amino acids C) contain nitrogen D) are nonpolar