Which is incorrect about Neanderthals?
A. They interbred with the modern humans that replaced them.
B. They were replaced by Cro-Magnons.
C. They abruptly disappeared from the fossil record about 34,000 years ago.
D. They made diverse tools.
E. They were named after the Neander Valley of Germany.
Answer: A
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A linear strand of DNA is 1,000 bp long. A recognition sequence for the restriction enzyme Eco R1 is located 300 base pairs (bp) from the 5' end of this linear DNA molecule. Digesting this DNA molecule with Eco RI would produce ________
A) one DNA fragment, 1,000 bp long B) three DNA fragments, two of them 300 bp long and one 400 bp long C) two DNA fragments, one 300 bp long and one 700 bp long D) two fragments, each 500 bp long E) none of the above
Which of the following statements BEST explains the observation that there are more autism cases now than in the past?
a. There are more parents who neglect their children, which is a cause of autism, now than in the past. b. Autism has been selected for in recent generations by natural selection. c. The vaccine for measles, mumps, and rubella has been established as a significant cause of autism. d. Doctors are more aware of the condition and have better techniques for diagnosing and reporting it. e. All of the above are equally good explanations for the observation that there are more autism cases now than in the past.
Which of the following statements is TRUE?
A) both members are harmed in a symbiotic relationship B) Members of a symbiotic relationship cannot live without each other C) A parasite is not in symbiosis with its host D) Symbiosis always refers to different organisms living together and benefitting from each other E) At least one member must benefit in a symbiotic relationship
________ is a syndrome that occurs in females who have only a single X chromosome (XO)
Fill in the blank(s) with correct word