Which amino acid would Nirenberg and Leder have found when they used the triplet UAG?
A. Isoleucine
B. Proline
C. Lysine
D. Threonine
E. None of these
E. None of these
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Which of the following would NOT be a characteristic of the first life forms on Earth, that is, the very first primitive cells?
A. Oxygen was required for the cells to survive. B. A molecule evolved as a way to store genetic information. C. A barrier made of organic molecules separated the "cell" from the environment. D. Chemical reactions evolved as a way for cells to capture energy from the environment.
What is the main cause of carbon dioxide build-up in the atmosphere?
a. burning fossil fuels b. deforestation c. droughts d. flooding e. respiration due to overpopulation
The only gene successfully targeted for breast cancer prevention is the
a. estrogen promoter gene. b. estrogen receptor gene. c. uterine promoter gene. d. uterine receptor gene. e. breast promoter gene.
There have been several mass extinctions in the planet's history, such as the extinction of the dinosaurs, but the current mass extinction is different. Greater numbers of species are now going extinct faster than ever before
Also unique to the current mass extinction is the cause. What is causing the current mass extinction? A) Man's direct activities B) Climate change C) Rising sea levels D) Solar flares