Birds are most closely related to:
a. reptiles.
b. testudines.
c. mammals.
d. labyrinthodonts.
e. terrapins.
A
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Imagine you are talking to your friend who is very excited because he has just transduced his first batch of bacteria in the laboratory. What does this mean?
A. He introduced a gene of interest into his bacteria using viruses. B. He introduced a gene of interest into his bacteria using other bacterial species that can form pili. C. He introduced a gene of interest into his bacteria by lysing other bacterial cells and exposing his bacteria to this mixture. D. He produced a strain of antibiotic-resistant bacteria by exposing his bacterial cultures to antibiotics. E. Through periodic selection, he was able to isolate a gene of interest in his bacteria.
What percentage of the species that have ever lived have become extinct?
a. 1 percent b. 9 percent c. 50 percent d. 75 percent e. 99 percent
The open ocean is a/an ________ environment.
A. oligotrophic B. neotrophic C. phylotrophic D. eutrophic
The central dogma of molecular biology states that:
a. DNA is transcribed into RNA, which is translated into protein. b. DNA is translated into protein. c. DNA is translated into RNA, which is transcribed into protein. d. RNA is transcribed into protein. e. DNA is transcribed into RNA