Why is it helpful to think about the moment conditions of a simple linear regression even if OLS yields the same estimates?
A. The moment conditions will get the smaller standard errors.
B. The moment conditions establish causality whereas OLS just estimates correlation.
C. The moment conditions are easier to program in Excel.
D. The moment conditions facilitate assessing assumptions about causality.
Answer: D
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Mitochondria contain their own DNA and replicate on their own. Why is it that they don't suffer the same consequences as our cells in terms of limited division?
A. Because they have high telomerase activity. B. Shortening of the DNA is only a problem with nuclear DNA; shortening of mitochondrial DNA isn't catastrophic. C. Mitochondrial DNA is circular, so it doesn't shorten when it replicates. D. Since mitochondrial DNA only contains a few genes, it can last a lot longer. E. Because they have high telomerase activity and their DNA is circular and so doesn't shorten in replication.
A limitation of retrovirus-mediated gene transfer is that ________
A) retroviruses cannot be used to make transgenic animals B) retroviruses only work with Ti vectors C) retroviruses only integrate DNA at specific sites D) retroviruses integrate DNA randomly in the genome E) retroviruses can only be used to make transgenic plants
Babies were accidentally switched at the hospital! Mr. and Mrs. Fire both have type O blood. Which of the following four babies of the same age is most likely the Fire child?
A) baby with type A B) baby with type B C) baby with type AB D) baby with type O
Many cases of pediatric thyroid cancer occurred after the 1986 Chernobyl nuclear accident in Ukraine and the cause was traced to milk containing iodine-131
Which of these might be the most effective method to prevent thyroid cancer increase following exposure to excessive radiation? A) Do not allow anyone to drink any milk. B) Give dairy cows large doses of iodine. C) Give humans large doses of iodine before exposure. D) Give people large doses of iodine a few days following exposure.