World human population in 2011 was approximately
A. 5 billion.
B. 800 million.
C. 10 billion.
D. 7 billion.
E. 670 million.
Answer: D
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Why does the author seem skeptical about the idea of in-vitro fertilization leading to the evolution of a “genius species?”
a. Scientists can’t test embryos to see if certain genes are expressed. b. Scientist can’t select which embryos to implant c. There are too many genes thought to influence IQ, and they don’t know enough about the genetic basis of intelligence to select for it. d. All of the above
The structures used for motility in both eukaryotes and prokaryotes are
A. cilia. B. flagella. C. pili. D. fimbriae.
In the classic experiment conducted by Hershey and Chase, why was the pellet radioactive in the centrifuge tube that contained bacteria with viruses?
A) The radioactive viruses (coats plus DNA) were in the pellet. B) The radioactive protein coats of the viruses were in the pellet. C) The bacteria were in the pellet, and they had incorporated radioactive proteins into their cell membranes. D) The radioactive viruses were in the pellet, and the bacteria were in the supernatant. E) The bacteria were in the pellet, and many contained the radioactive viral DNA.
The basic level of an ecological study always begins by looking at how populations interact with each other.
Answer the following statement true (T) or false (F)