Mom and dad come to you, their doctors, and report no dirty diapers after feedings. Their now 3-day-old baby isn't pooping, and they feel something is wrong. Which of the following reasons could possibly explain this?
a. The baby hasn't eaten enough.
b. There is a blockage somewhere in the baby's digestive track.
c. The baby has no bacteria in its gut.
d. The digestive enzymes in the gut are not functioning properly.
Answer:
b. There is a blockage somewhere in the baby's digestive track.
d. The digestive enzymes in the gut are not functioning properly.
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What is the benefit of using Taq polymerase in PCR?
A. Because it is taken from a bacteria with a circular DNA molecule, the DNA molecule doesn't shorten during PCR. B. Because it is taken from a bacteria, this enzyme works much quicker than other types of DNA polymerase. C. Because it is taken from a bacteria that lives in high temperatures, it does not denature and more DNA polymerase does not have to be added after every cycle. D. Because it is taken from a bacteria, this polymerase makes fewer mistakes. E. None of the answer options are correct.
What is the largest single source of radiation exposure for the average person in the U.S.?
a. radon b. medical X-rays c. cosmic d. nuclear medicine e. consumer products
In addition to recording the lot number, date received, condition received, and expiration date, antisera should be:
a. discarded after each use. b. frozen upon arrival. c. dated when opened. d. tested by the supervisor first before any-one uses it.
Primary producers obtain energy from a(n) __________ source and use it to build organic compounds from inorganic
starting materials. Fill in the blank(s) with the appropriate word(s).