A polypeptide forms a pleated sheet or a helix as its tertiary structure.
a. true
b. false
Answer: b. false
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Scientists have learned the full extent of viral abundance on earth because
A. a wide variety of microbes is available to act as hosts for these viruses. B. metagenomic sequencing has identified viruses in a broad variety of environments. C. the final step of the viral life cycle, release of mature viruses and cell lysis, releases millions of viruses. D. viruses are known to grow on all life forms: animal, plant, fungi, and bacteria.
Which of the following is a characteristic of tundra?
A. temperate climate B. permafrost C. more than 100 cm of rain a year D. deciduous forests E. high biodiversity
Sheila is experiencing contractions every 15 to 20 minutes that last for 40 seconds or longer. Is she in labor?
A. No B. Yes
The genome sequence of Treponema pallidum ________.
A. should ultimately help us understand the mechanism by which this organism causes syphilis B. has led us to be able to completely eradicate this organism C. identified proteins that have already been used to produce the first successful vaccine for syphilis D. almost immediately provided explanations for how this organism causes syphilis