Miller and Urey's experiment was ground breaking because
A. This was the first example of an experiment being used that inserted oxygen into the prebiotic soup.
B. This was the first attempt to apply scientific experimentation to the quest of understanding the origin of life.
C. They hypothesized what could have been the first molecules formed, but they could not demonstrate this in a scientific experiment.
D. This was the last experiment that used boiling water as a trigger mechanism for the production of macromolecules.
E. This was the first experiment based on the theory that organic carbon actually arrived from outer space.
B. This was the first attempt to apply scientific experimentation to the quest of understanding the origin of life.
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What are the consequences of a viral infection of an animal cell?
A) rapid lysis or latent infections B) lysogeny followed by eventual lysis C) lysis or lysogeny D) Outcomes vary from rapid lysis to persistent infections, latent infections, or cancer.
Chloe has the scaly skin condition icthyosis, which is X-linked recessive. Which of the following is most likely true?
A) Her mother and father were both unaffected carriers. B) Her mother was affected and her father was unaffected. C) Her father was a carrier. D) Her mother was a carrier and her father was affected.
Transgenic crop plants are primarily developed for which of the following reasons?
a. To improve disease resistance b. To study patterns of inheritance c. To facilitate genetic testing d. To develop new vaccines
At which point during pregnancy can human chorionic gonadotropin be detected in the mother’s blood?
1.at the time of fertilization 2.at the time of implantation 3.by the first week of pregnancy 4.by the third week of pregnancy 5.by the sixth week of pregnancy