A bacterium that uses the oxidation of inorganic compounds to provide energy for manufacturing nutritious organic
compounds is a:
a. parasite.
b. pathogen.
c. saprotroph.
d. chemoautotroph.
e. photoautotroph.
d
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An organism that carries a disease between hosts is a
A. parasite. B. predator. C. vector. D. All of these answers are true.
Suppose that you have many observations of the employee level longevity and the wage earned by that employee that year. You run the regression Longevityi = ?0 + ?1 Wagei +Ui, and get an estimate of ?1. Now, suppose that a member of the analytics team suggests that education is an omitted variable in your regression and is likely biasing your estimate of ?1. Suppose you knew that, conditional on Wage, more educated employees tended to have shorter stints with the company (lower longevity) and that the error, ?i, in the equation Longevityi = ?0 + ?1Wagei + ?2 Educationi + Ui, was uncorrelated with both Wage and Education. How would you sign the bias on your estimate of ?1?
A. Argue that education is positively correlated with wage and that your estimate of ?1 is a lower bound. B. Argue that education is negatively correlated with wage and that your estimate of ?1 is a lower bound. C. Argue that education is positively correlated with wage and that your estimate of ?1 is an upper bound. D. Argue that education is positively correlated with longevity and that your estimate of ?1 is an upper bound.
Small, hydrophobic molecules pass through a cell membrane most easily by diffusion
Indicate whether the statement is true or false
What is the main function of the nucleolus?
A) It produces enzymes that are then exported to the lysosomes. B) It produces cell adhesion proteins that are then exported to the cell membrane. C) It is the site of ribosome-subunit synthesis. D) It is the site of photosynthesis in photosynthetic cells. E) It is the site of cellular waste digestion and recycling.