The anterior-posterior orientation of Drosophila embryos is initially controlled by ____
a. maternal effect genes
b. gap genes
c. pair rule genes
d. segment polarity genes
e. homeotic genes
ANSWER: a
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Genes on newly synthesized DNA molecules can be
blocked by the addition of __________ to the DNA. a. –CH3 b. –CH3COc. –NH2 d. –H2O e. any of these
Which sex chromosome combinations would you expect to find in a male calico cat?
a. XX b. XXY c. XYY d. XY
Cholesterol transported by HDL is metabolized in what organ
What will be an ideal response?
In words, why can utilizing an instrumental variable be an effective means toward identifying the causal effect of a treatment on an outcome?
A. It allows you to identify the causal effect of the treatment by using only variation in the treatment that isn't correlated with unobservables that affect the outcome. B. It allows you to identify the causal effect of the treatment by using only variation in the treatment that is correlated with unobservables that affect the outcome. C. It allows you to identify the causal effect of the treatment by controlling for unobservables that may crucially affect the outcome. D. None of the answers is correct.