The double helix model of DNA suggested by Watson and Crick was exciting to the scientific community because:
a. it opened the door to new PCR based technologies.
b. it explained how genetic material could be duplicated by means of the complementary strands.
c. it suggested the role of DNA in protein synthesis.
d. it proved once and for all that DNA was the messenger of heritable traits.
e. All of the above are correct.
Ans: b. it explained how genetic material could be duplicated by means of the complementary strands.
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The process that most involves the selective uptake of a specific cargo molecule into the cell through receptor binding and aggregation is
A. pinocytosis. B. receptor-mediated endocytosis. C. autophagocytosis. D. phagocytosis. E. receptor-mediated exocytosis.
DNA strands can be clipped crosswise at selected positions by using enzymes called ________.
A. palindromes B. reverse transcriptases C. restriction endonucleases D. ligases E. DNA polymerases
Which of the following is NOT a stimulus that can be perceived by sensory signals?
a. radiation b. heat c. body position d. magnetic fields e. electrical fields
Leprosy is a disease
A. of lung tissue. B. that has been eradicated around the world. C. caused by a pathogen that cannot be cultured in the lab. D. can be diagnosed by the Mantoux test. E. caused by a sporeforming, gram-positive bacillus.