Reverse transcriptase is an enzyme that can synthesize DNA from an RNA template. What DNA sequence is produced from an RNA molecule with the sequence 5'AUUGACGGU3'?
A. 5'TTTCTGCCT3'
B. 3'UAACUGCCA5'
C. 3'TAACTGCCA5'
D. 5'ATTCAGCCT3'
E. 3'TUUCTGCCU5'
Answer: C
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The perceived flavor of food depends on both sense of taste and smell. The sensory receptors of olfaction are _________________ and those of taste buds are ______________
A. chemoreceptors; thermoreceptors B. mechanoreceptors; chemoreceptors C. nociceptors; thermoreceptors D. chemoreceptors; also chemoreceptors
A recombinant DNA was constructed by inserting the DNA of interest into the AmpR gene of a pBR322 vector. The vector also contains a TetR gene that is not interrupted
After introducing the recombinant DNA into bacterial cells, the resulting transformants were tested on a variety of media. Which of the following results would be expected? A. growth on both ampicillin containing media and tetracycline containing media B. growth on ampicillin but not tetracycline containing media C. growth on tetracycline but not ampicillin containing media D. no growth on either ampicillin or tetracycline containing media E. growth only on media containing both antibiotics
Which statement describes a difference between meiosis I and meiosis II?
a. DNA is replicated during meiosis II but not during meiosis I. b. Homologous chromosomes separate during meiosis I; sister chromatids separate during meiosis II. c. Meiosis I produces diploid cells; meiosis II produces haploid cells. d. Chromosomes align along the equatorial plane of the cell in meiosis I but not in meiosis II. e. Crossing-over occurs during meiosis II but not during meiosis I.
During which stage of the cell cycle does the M checkpoint occur?
A. telophase B. metaphase C. S phase D. G1 E. prophase