In order for a variable to be a valid instrumental variable it needs to satisfy which two conditions?
A. Efficient and uncorrelated
B. Relevant and efficient
C. Relevant and exogenous
D. Exogenous and consistent
Answer: C
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Answer the following statements true (T) or false (F)
1. Epstein-Barr virus is associated with several types of cancer. 2. Some cases of genital herpes are caused by the same virus that causes cold sores. 3. Smallpox virus, monkeypox virus, and chickenpox virus are all considered to be pox viruses. 4. Epstein-Barr virus is a type of herpes virus. 5. Genital warts can become malignant.
The septum in a fungus is
A. the seventh cellular division. B. the seventh nucleus in a dikaryote cell. C. the seventh cell from the tip of the hypha. D. the demarcation between the mycelium and the fruiting body. E. a cross wall that separates hyphae into cells.
If S. niagarae did evolve into S. yellowstonensis this would be an example of which of the following?
a. Directional selection b. Stabilizing selection c. Disruptive selection d. Artificial selection
A hypothetical population has two alleles for a gene: A and a. In a random sample of 100 individuals, 20 are homozygous for a, 20 are homozygous for A, and 60 are heterozygous. What is the frequency of A?
A) 20% B) 25% C) 50% D) 60% E) 80%