Imagine you are a doctor and you are presented with a female patient who has been unable to get pregnant despite 2 years of trying with the same partner. Rank the following factors from most important (#1) to least important (#4) in your determination of the cause of her apparent infertility.
a. Her STD history
b. Her hormone levels
c. Her partner's age
d. Her age
a. 2
b. 3
c. 4
d. 1
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In early forensic applications of DNA fingerprinting, DNA was extracted from crime scene material, digested with restriction enzymes, and then used to prepare a Southern blot. Today, polymerase chain reaction (PCR) is used in the early steps of forensic
DNA analysis. Which of the following is an advantage that PCR provides over the former method? A) PCR produces many more bands for fingerprint analysis, making it a more informative technique. B) PCR can cut DNA at many more sites than can restriction enzymes. C) PCR requires much less DNA for analysis. D) PCR can analyze DNA, proteins, and carbohydrates, whereas restriction enzyme analysis is limited to DNA.
The velocity of water in a stream channel is greater along the margins of the channel than in the center of the channel
Indicate whether the statement is true or false
Why does immersion oil improve resolution?
A) It allows light to travel at a uniform speed on its way to the lens. B) It decreases the working distance. C) It increases the numerical aperture. D) It increases numerical aperture and maintains a uniform light speed. E) It increases the angle of refraction of the light.
In order for a game to be a true prisoner's dilemma, which of the following conditions must be met? P = Pun-ishment for mutual defection, R = Reward for mutual cooperation, S = "Sucker's" payoff, T = Temptation to defect
a. T>R>P>S c. R>P>S>T b. S>P>T>R d. R>P>T>S