Which of the following statements about the structure or composition of DNA is FALSE?

A. DNA is a double helix.
B. Complementary base-pairing occurs between pyrimidine and purine bases.
C. The amount of thymine closely approximates that of guanine within a particular organism.
D. Each nucleotide within a DNA strand is separated by about 0.34 nm.
E. Adenine pairs with thymine and guanine with cytosine.


C. The amount of thymine closely approximates that of guanine within a particular organism.

Biology & Microbiology

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Which of the following biochemical reactions identifies an organism associated with blood, bone, and joint infections in young children?

a. Positive catalase, positive nitrate reduc-tion, and positive indole b. Negative catalase, positive nitrate reduc-tion, and positive indole c. Negative catalase, negative nitrate reduc-tion, and positive indole d. Negative catalase, negative nitrate reduc-tion, and negative indole

Biology & Microbiology

A sizable population was analyzed for SNPs in a certain DNA region. Four possible variants were found, with the following frequencies: SNP 1: GGTCTAGGA; frequency = 0.91 SNP 2: GGTGTAGGA; frequency = 0.03 SNP 3: GGTATAGGA; frequency = 0

03 SNP 4: GGTTTAGGA; frequency = 0.03 If the population is in Hardy-Weinberg equilibrium, what is the total frequency of heterozygotes at this SNP locus? A) 0.828 B) 0.009 C) 0.170 D) 0.055 E) 0.0018

Biology & Microbiology

Which of the following vectors must be transformed to get into bacterial cells?

A. yeast. B. fungus. C. plasmid. D. virus. E. bacteriophage.

Biology & Microbiology

Microfilaments are made of ________

A) tubulin B) actin C) intermediate proteins D) phospholipids

Biology & Microbiology