A key part of DNA's function is to encode information. In considering how information-rich a particular molecule might be, a question is how many different sequences are possible in a particular length of the molecule. In the case of DNA the four
different nucleotides can be arranged in any order. How many different sequences are possible for a DNA strand three nucleotides long?
A) 32 B) 3 C) 4 D) 64 E) 16
Answer: D
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A cell in G2 before meiosis begins, compared with one of the four cells produced at the end of meiosis II, has
A. twice as much DNA and twice as many chromosomes B. four times as much DNA and twice as many chromosomes C. twice as much DNA but the same number of chromosomes D. four times as much DNA and four times as many chromosomes E. twice as much DNA and half as many chromosomes
Which one of the following biological polymers is mismatched with its monomer?
A) DNA - nucleotide B) enzyme - amino acid C) chitin - monosaccharide D) protein - amino acid E) cellulose - amino acid
The two photosystems of light reactions differ
slightly in their a. carotenoids. b. xanthophylls. c. chlorophyll b. d. chlorophyll a. e. location in the stroma.
__________________ isolating mechanisms include hybrid mortality and hybrid infertility.
a) Postzygotic b) Sympatric c) Prezygotic d) Barrier e) Environmental