The emergent property of “life” appears at the level of the ____, when many molecules become organized
a. population
b. atom
c. organism
d. cell
e. community
ANSWER: d
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Answer the following statements true (T) or false (F)
1. When lactose becomes available the genes encoding ?-galactosidase and lactose permease are upregulated in E. coli. 2. Different globin polypeptides are expressed at similar levels during the embryonic and fetal stages of mammalian development. 3. Bacteria can regulate gene expression by controlling the rate at which mRNA is translated into protein. 4. Small effector molecules directly bind the DNA they regulate.
Which system is considered a closed system?
a. a human b. a gas-powered automobile c. a single-celled organism d. a propane furnace e. the Earth
Rises in blood pressure with large increases in cardiac output are limited by decreases in total peripheral resistance.
Answer the following statement true (T) or false (F)
Class II MHC genes code for
A. certain secreted complement components. B. all HLA antigens. C. self receptors recognized by natural killer cells. D. receptors located primarily on macrophages, dendritic cells, and B cells. E. All of these choices are correct.